Jack Kochanowicz

PActive

Bats/Throws: L/RAge: 25Born: Philadelphia, PA, United StatesDebut: Jul 11, 2024Draft: 2019

Jack Kochanowicz is a pitcher for the Los Angeles Angels. Kochanowicz was born on December 22, 2000 in Philadelphia, PA, United States and debuted in the major leagues on July 11, 2024. Kochanowicz bats left and throws right. The Los Angeles Angels drafted Kochanowicz in 2019 (round 3, pick 92 overall) out of Harriton HS. In 2026, Kochanowicz has an ERA of 6.19 with a WHIP of 1.58 and 47 strikeouts over 64.0 innings in 13 games. MLBDB has 3 seasons of statistics for Kochanowicz, from 2024 to 2026.

ERA6.192026 season

SO472026 season

WHIP1.582026 season

Seasons3Los Angeles Angels

Pitching

3 seasons of pitching across 1 club. Season totals, oldest first. The team shown identifies the player's club when the totals were recorded.

Jack Kochanowicz, season by season pitchingRegular season, oldest first
Season	Team	W	L	W-L%	ERA	G	GS	IP	H	R	ER	HR	BB	SO	WHIP
2024LAA	LAAAngels	2	6	.250	3.99	11	11	65.1	68	30	29	7	10	25	1.19
2025LAA	LAAAngels	3	11	.214	6.81	23	23	111.0	136	89	84	21	58	72	1.75
2026LAA	LAAAngels	2	5	.286	6.19	13	13	64.0	65	47	44	7	36	47	1.58

W: Wins.
L: Losses.
W-L%: Win-loss percentage. Formula: W ÷ (W + L).
ERA: Earned run average, earned runs per nine innings. Formula: 27 × ER ÷ outs recorded.
G: Games pitched.
GS: Games started.
SV: Saves.
IP: Innings pitched. .1 and .2 mean one and two outs.
H: Hits allowed.
R: Runs allowed, earned and unearned.
ER: Earned runs allowed.
HR: Home runs allowed.
BB: Walks allowed, including intentional walks.
SO: Strikeouts.
WHIP: Walks plus hits per inning pitched. Formula: 3 × (BB + H) ÷ outs recorded.

Jack Kochanowicz, starts and relief by seasonRegular season, oldest first
Season	Team	GS	QS	QS%	IS%
2024LAA	LAAAngels	11	8	72.7%	N/A
2025LAA	LAAAngels	23	4	17.4%	N/A
2026LAA	LAAAngels	13	5	38.5%	N/A

GS: Games started.
CG: Complete games, starts in which the pitcher pitched the whole game.
SHO: Shutouts, complete games with no runs allowed.
QS: Quality starts, starts of at least six innings with three or fewer earned runs.
QS%: Quality-start rate. Formula: 100 × QS ÷ GS.
GF: Games finished, relief appearances as the team's last pitcher of the game.
SV: Saves.
SVO: Save opportunities.
BS: Blown saves.
HLD: Holds.
SV+HLD: Saves plus holds.
IR: Inherited runners, runners on base when the pitcher came in from the bullpen.
IRS: Inherited runners who scored.
IS%: Share of inherited runners who scored. Formula: 100 × IRS ÷ IR.

Jack Kochanowicz, expanded pitching by seasonRegular season, oldest first
Season	Team	IP	BF	IBB	HBP	BK	WP	SB	CS	CS%	Pick	RA9	H/9	HR/9	BB/9	K/9	K/BB	Strike%
2024LAA	LAAAngels	65.1	266	1	8	0	1	2	2	50.0%	0	4.13	9.37	0.96	1.38	3.44	2.50	68.3%
2025LAA	LAAAngels	111.0	512	4	7	1	4	4	3	42.9%	0	7.22	11.03	1.70	4.70	5.84	1.24	61.6%
2026LAA	LAAAngels	64.0	296	1	5	0	6	1	0	0.0%	N/A	6.61	9.14	0.98	5.06	6.61	1.31	60.8%

IP: Innings pitched. .1 and .2 mean one and two outs.
BF: Batters faced.
IBB: Intentional walks.
HBP: Batters hit by a pitch.
BK: Balks.
WP: Wild pitches.
SB: Stolen bases allowed.
CS: Runners caught stealing.
CS%: Caught-stealing rate. Formula: 100 × CS ÷ (SB + CS).
Pick: Runners picked off.
RA9: Runs allowed per nine innings, earned and unearned. Formula: 27 × R ÷ outs recorded.
H/9: Hits allowed per nine innings. Formula: 27 × H ÷ outs recorded.
HR/9: Home runs allowed per nine innings. Formula: 27 × HR ÷ outs recorded.
BB/9: Walks allowed per nine innings. Formula: 27 × BB ÷ outs recorded.
K/9: Strikeouts per nine innings. Formula: 27 × SO ÷ outs recorded.
K/BB: Strikeouts per walk. Formula: SO ÷ BB.
Strike%: Strike rate. Strikes include fouls and balls put in play. Formula: 100 × strikes ÷ pitches.

Jack Kochanowicz, advanced pitching by seasonRegular season, oldest first
Season	Team	IP	BF	ERA	FIP	BABIP	K%	BB%	K−BB%	HR%	Opp AVG	Opp OBP	Opp SLG	Opp OPS
2024LAA	LAAAngels	65.1	266	3.99	4.62	.284	9.4%	3.8%	5.6%	2.6%	.275	.325	.417	.742
2025LAA	LAAAngels	111.0	512	6.81	6.05	.325	14.1%	11.3%	2.7%	4.1%	.309	.393	.489	.881
2026LAA	LAAAngels	64.0	296	6.19	4.98	.289	15.9%	12.2%	3.7%	2.4%	.259	.358	.382	.741

IP: Innings pitched. .1 and .2 mean one and two outs.
BF: Batters faced.
ERA: Earned run average, earned runs per nine innings. Formula: 27 × ER ÷ outs recorded.
FIP: Fielding Independent Pitching. Estimates pitching performance from home runs, walks, hit batters and strikeouts on an ERA-like scale. Uses the matching season's constant, includes intentional walks and can be negative in a small sample. Formula: [13 × HR + 3 × (BB + HBP) − 2 × SO] ÷ IP + season FIP constant.
BABIP: Pitcher Batting Average on Balls in Play. Hits allowed on balls in play, excluding home runs. Defense and contact quality affect this measure; it does not isolate a pitcher's skill. Formula: (H − HR) ÷ (AB − SO − HR + SF).
K%: Pitching Strikeout Percentage. The percentage of batters faced who strike out. Formula: 100 × SO ÷ BF.
BB%: Pitching Walk Percentage. The percentage of batters faced who walk, including intentional walks. Formula: 100 × BB ÷ BF.
K−BB%: Strikeout Minus Walk Percentage. Strikeout percentage minus walk percentage, expressed as percentage points. It compares strikeouts with walks at the same workload. Formula: 100 × (SO − BB) ÷ BF.
HR%: Home runs per batter faced. Formula: 100 × HR ÷ BF.
Opp AVG: Opponents' batting average. Formula: H ÷ AB.
Opp OBP: Opponents' on-base percentage. Formula: (H + BB + HBP) ÷ (AB + BB + HBP + SF).
Opp SLG: Opponents' slugging percentage. Formula: TB ÷ AB.
Opp OPS: Opponents' on-base plus slugging. Formula: OBP + SLG.

Read advanced measures alongside playing time. N/A means the required inputs or season calculations are unavailable.

Advanced calculation notes by season

Fielding

3 seasons of fielding across 1 club. Fielding is shown by recorded position; games at different positions can overlap.

Jack Kochanowicz, fielding by seasonRegular season, oldest first
Season	Team	Pos	G	GS	INN	TC	PO	A	E	DP	FLD%	RF/9	RF/G
2024LAA	LAAAngels	P	11	11	65.1	10	3	7	0	1	1.000	1.38	0.91
2025LAA	LAAAngels	P	23	23	111.0	18	4	11	3	1	.833	1.22	0.65
2026LAA	LAAAngels	P	13	13	64.0	17	9	7	1	0	.941	2.25	1.23

Pos: Position played. DH is designated hitter.
G: Games played at the position.
GS: Games started at the position.
INN: Innings in the field at the position. .1 and .2 mean one and two outs.
TC: Total chances. Formula: PO + A + E.
PO: Putouts.
A: Assists.
E: Errors.
DP: Double plays turned.
FLD%: Fielding percentage. Formula: (PO + A) ÷ TC.
RF/9: Range factor per nine innings. Formula: 27 × (PO + A) ÷ outs in the field.
RF/G: Range factor per game. Formula: (PO + A) ÷ G.

Pitch data

Recorded measurements and MLBDB estimates from the pitches thrown and the balls put in play against this pitcher. Each table's note says which.

MLBDB calculates these numbers from recorded game measurements. EV balls and LA balls show the sample sizes. EV+LA balls have both measurements and are used for barrel percentage. Seasons without these measurements show N/A.

Jack Kochanowicz, pitching by season: contactRegular season, oldest first
Season	Team	BBE	EV+LA balls	MLBDB barrels	MLBDB Barrel%	EV balls	Avg EV balls	Avg EV	Max EV	Hard-hit%	LA balls	Avg LA balls	Avg LA	Sweet-spot%
2024LAA	LAAAngels	223	220	14	6.4%	220	218	90.3	113.9	45.0%	222	220	3.6	31.5%
2025LAA	LAAAngels	375	373	35	9.4%	373	372	92.1	116.6	49.9%	374	373	6.9	29.1%
2026LAA	LAAAngels	208	204	15	7.4%	204	202	89.4	111.4	43.6%	204	202	4.7	32.4%

BBE: Batted Balls Allowed. Completed turns to bat that ended with a batted ball, including home runs. Some balls have no speed or angle measurement.
EV+LA balls: Balls with Recorded Speed and Angle Allowed. Balls that have both a usable speed and angle measurement. These are the balls used to calculate barrel percentage.
MLBDB barrels: MLBDB Barrels Allowed. Balls hit very hard at an angle suited to deep hits. MLBDB checks the recorded speed and angle against its documented barrel zone. Balls missing either measurement are left out. Rounded measurements can affect close calls. This is MLBDB's calculated classification.
MLBDB Barrel%: MLBDB Barrel Percentage Allowed. The percentage of balls with both speed and angle recorded that MLBDB counts as barrels. Missing measurements are left out. Formula: 100 × barrels ÷ balls with recorded speed and angle.
EV balls: Balls with Recorded Speed Allowed. All batted balls with a usable speed measurement, including bunts. This is the sample used for hard-hit percentage.
Avg EV balls: Average Exit Velocity Sample Allowed. Balls with recorded speed, excluding labelled bunts. Used for average and maximum exit velocity.
Avg EV: Average Exit Velocity Allowed. Average ball speed just after contact, in miles per hour. Balls with no speed measurement are left out. Balls labelled as bunts are excluded. Unknown bunt labels are retained. Formula: Sum of recorded speeds excluding labelled bunts ÷ Avg EV balls.
Max EV: Maximum Exit Velocity Allowed. The fastest recorded batted ball, in miles per hour. Balls labelled as bunts are excluded. Unknown bunt labels are retained.
Hard-hit%: Hard-Hit Percentage Allowed. The percentage of speed-measured balls hit at least 95 miles per hour. Formula: 100 × hard-hit balls ÷ balls with recorded speed.
LA balls: Balls with Recorded Angle Allowed. All batted balls with a usable angle measurement, including bunts. This is the sample used for sweet-spot percentage.
Avg LA balls: Average Launch Angle Sample Allowed. Balls with recorded angle, excluding labelled bunts. Used for average launch angle.
Avg LA: Average Launch Angle Allowed. Average angle at which the ball leaves the bat, in degrees. A negative angle points toward the ground. Higher is not always better. Balls labelled as bunts are excluded. Unknown bunt labels are retained. Formula: Sum of recorded angles excluding labelled bunts ÷ Avg LA balls.
Sweet-spot%: Sweet-Spot Percentage Allowed. The percentage of angle-measured balls launched from 8 to 32 degrees. Formula: 100 × sweet-spot balls ÷ balls with recorded angle.

Direction is estimated from recorded hit locations and the hand used to bat on each play. Rates divide by Located balls and show N/A below 95% location coverage. Unmapped balls are left out. Higher is not always better.

Jack Kochanowicz, pitching by season: hit directionRegular season, oldest first
Season	Team	Located balls	Location coverage	Pull%	Center%	Oppo%	Pull balls	Center balls	Oppo balls
2024LAA	LAAAngels	223	100.0%	39.5%	40.8%	19.7%	88	91	44
2025LAA	LAAAngels	375	100.0%	41.3%	37.3%	21.3%	155	140	80
2026LAA	LAAAngels	208	100.0%	42.3%	36.1%	21.6%	88	75	45

Located balls: Opponents' Balls with Usable Hit Locations. Balls whose recorded location and batting hand support an estimate of pull, center or opposite-field direction.
Location coverage: Opponents' Hit-Location Coverage. The share of all balls that can be mapped. A rounded 95% can be slightly below the cutoff; the cutoff uses the original counts. Formula: 100 × located balls ÷ all batted balls.
Pull%: Opponents' Estimated Pull Percentage. The share of located balls hit toward the batter's pull side. Uses located balls only. N/A when fewer than 95% of all balls can be mapped. These are chart-based estimates. Formula: 100 × pulled balls ÷ located balls.
Center%: Opponents' Estimated Center-Field Percentage. The share of located balls estimated toward center field. Uses located balls only. N/A when fewer than 95% of all balls can be mapped. These are chart-based estimates. Formula: 100 × center-field balls ÷ located balls.
Oppo%: Opponents' Estimated Opposite-Field Percentage. The share of located balls hit toward the side opposite the batter's pull side. Uses located balls only. N/A when fewer than 95% of all balls can be mapped. These are chart-based estimates. Formula: 100 × opposite-field balls ÷ located balls.
Pull balls: Opponents' Estimated Pulled Balls. Balls estimated toward the pull side: left field for right-handed hitters, or right field for left-handed hitters.
Center balls: Opponents' Estimated Balls to Center. Balls estimated toward center field, regardless of batting hand.
Oppo balls: Opponents' Estimated Opposite-Field Balls. Balls estimated toward the opposite side: right field for right-handed hitters, or left field for left-handed hitters.
Unmapped balls: Opponents' Balls with Unusable Hit Locations. Balls with missing details, unusable coordinates or locations outside the field area used for these estimates. They are excluded from direction percentages.

Pitches counts every pitch actually thrown; automatic balls and strikes are left out. Swings include bunt attempts, and caught foul tips count as whiffs. Whiff% divides misses by swings; SwStr% divides misses by pitches. Zone rates need a recorded location for at least 95% of pitches. Missing results show N/A. For 2018 through 2024, inside or outside the zone is an MLBDB estimate from recorded pitch locations and batter zone heights; from 2025, MLB's recorded zone labels are used.

Jack Kochanowicz, pitching by season: pitch disciplineRegular season, oldest first
Season	Team	Pitches	Swings	Whiff%	SwStr%	Contact%	Swing%	Chase%	Zone%	Z-Swing%	Z-Contact%	O-Contact%	First delivered strike%	Called%	CSW%	Zone coverage
2024LAA	LAAAngels	859	461	15.2%	8.1%	84.8%	53.7%	28.5%	57.0%	72.7%	88.5%	72.4%	61.5%	14.7%	22.8%	100.0%
2025LAA	LAAAngels	1859	884	20.8%	9.9%	79.2%	47.6%	27.0%	48.7%	69.2%	87.9%	58.0%	59.5%	14.0%	23.9%	100.0%
2026LAA	LAAAngels	1106	500	23.6%	10.7%	76.4%	45.2%	25.6%	47.1%	67.2%	83.1%	60.7%	53.6%	15.6%	26.2%	100.0%

Pitches: Opponents' Delivered Pitches. Pitches actually thrown to the batter in these completed games. Automatic balls and strikes are excluded.
Swings: Opponents' Swings. Attempts to hit a delivered pitch, including bunts.
Whiff%: Opponents' Whiff Percentage. How often a swing is recorded as a miss, including caught foul tips. This divides whiffs by swings. Formula: 100 × swings and misses ÷ swings.
SwStr%: Opponents' Swinging-Strike Percentage. How often a delivered pitch produces a whiff, including caught foul tips. This divides whiffs by pitches, not swings. Formula: 100 × swings and misses ÷ delivered pitches.
Contact%: Opponents' Contact Percentage. How often a swing touches the ball, including ordinary fouls and bunt attempts. Caught foul tips are excluded. Formula: 100 × swings with contact ÷ swings.
Swing%: Opponents' Swing Percentage. How often the batter swings at a delivered pitch. Formula: 100 × swings ÷ delivered pitches.
Chase%: Opponents' Chase Percentage. How often the batter swings at a pitch outside the strike zone. Also called O-Swing%. Formula: 100 × swings outside the zone ÷ pitches outside the zone.
Zone%: Opponents' Strike-Zone Percentage. The share of pitches with usable locations that are inside the strike zone. Formula: 100 × pitches inside the zone ÷ pitches with usable locations.
Z-Swing%: Opponents' Swing Percentage Inside the Zone. How often the batter swings at a pitch inside the strike zone. Formula: 100 × swings inside the zone ÷ pitches inside the zone.
Z-Contact%: Opponents' Contact Percentage Inside the Zone. How often a swing at a pitch inside the strike zone touches the ball. Formula: 100 × contact inside the zone ÷ swings inside the zone.
O-Contact%: Opponents' Contact Percentage Outside the Zone. How often a swing at a pitch outside the strike zone touches the ball. Formula: 100 × contact outside the zone ÷ swings outside the zone.
First delivered strike%: Opponents' First Delivered Pitch Strike Rate. The share of first delivered pitches that are strikes or put in play. Turns with no delivered pitch are excluded. Unfinished turns that had a pitch are included. Formula: 100 × first-pitch strikes ÷ first delivered pitches.
Called%: Opponents' Called-Strike Percentage. How often a delivered pitch is called a strike without a swing. Formula: 100 × called strikes ÷ delivered pitches.
CSW%: Opponents' Called Strikes and Whiffs. How often a delivered pitch is either a called strike or a swing and miss. Ordinary fouls are excluded; caught foul tips count as whiffs. Formula: 100 × called strikes plus misses ÷ delivered pitches.
Zone coverage: Opponents' Pitch-Location Coverage. The share of delivered pitches with a usable location. Zone rates need at least 95% coverage, checked before rounding.

MLBDB estimates these from recorded ball speed and angle, for seasons from 2018. A season or period shows N/A if any batted ball it needs is missing a measurement or falls outside what the model covers. That is common over a full season, and in 2018 and 2019 no regular player has complete measurements. Estimated ERA also needs the estimated wOBA to be inside the range its equation was checked on; the 2026 equation is provisional. Differences use actual results from the same completed games. These describe recorded contact, not future performance.

Jack Kochanowicz, pitching by season: expectedRegular season, oldest first
Season	Team	IP	ERA	MLBDB xERA	ERA − MLBDB xERA	Model balls	Measured%	MLBDB xBA	AVG − MLBDB xBA	MLBDB xSLG	SLG − MLBDB xSLG	MLBDB xwOBA	wOBA − MLBDB xwOBA	Missing pairs
2024LAA	LAAAngels	65.1	3.99	N/A	N/A	220	98.7%	N/A	N/A	N/A	N/A	N/A	N/A	3
2025LAA	LAAAngels	111.0	6.81	N/A	N/A	373	99.5%	N/A	N/A	N/A	N/A	N/A	N/A	2
2026LAA	LAAAngels	64.0	6.19	N/A	N/A	204	98.1%	N/A	N/A	N/A	N/A	N/A	N/A	4

IP: Innings pitched. .1 and .2 mean one and two outs.
ERA: Earned run average, earned runs per nine innings. Formula: 27 × ER ÷ outs recorded.
MLBDB xERA: MLBDB Estimated ERA. Estimated earned runs per nine innings, converted from MLBDB's expected wOBA with a separate equation for each season. Available for 2018 through 2026 when every needed contact contribution is available and unrounded expected wOBA is within the reviewed range. The 2026 equation is provisional. This describes recorded pitching; short periods can be unstable or N/A.
ERA − MLBDB xERA: ERA Minus MLBDB Estimate. Recorded ERA minus MLBDB's estimate, using the same completed games. A positive number means more earned runs were recorded than estimated. This does not measure luck alone. N/A when no pitching outs were recorded, the estimate is unavailable, or the saved game totals disagree with the latest totals.
Model balls: Opponents' Measured Balls Used in Estimates. Eligible batted balls with both speed and angle recorded. Defensive awards that do not count as at-bats are excluded.
Measured%: Opponents' Expected-Stat Measurement Coverage. The share of eligible batted balls with both speed and angle recorded. Each expected statistic shows N/A if any contact value it needs is missing or outside model support.
MLBDB xBA: Opponents' MLBDB Expected Batting Average. Estimated hits per at-bat from ball speed, angle and same-season running speed when available. Strikeouts remain at-bats. Each needed contact contribution must be available. Reviewed seasons are 2018 through 2026; the current season is provisional. Formula: Estimated hits in at-bats ÷ at-bats.
AVG − MLBDB xBA: Opponents' Batting Average Minus Expected. Recorded batting average minus the estimate, using the same completed games. A positive number means the actual result was higher. This does not measure luck alone.
MLBDB xSLG: Opponents' MLBDB Expected Slugging Percentage. Estimated bases from hits per at-bat. Singles count once, doubles twice, triples three times and home runs four times. Formula: Estimated total bases in at-bats ÷ at-bats.
SLG − MLBDB xSLG: Opponents' Slugging Minus Expected. Recorded slugging minus the estimate, using the same completed games. A positive number means more bases were recorded than estimated.
MLBDB xwOBA: Opponents' MLBDB Expected Weighted Batting Average. Combines reconstructed expected contact values with recorded walks and hit-by-pitches. Walks and hit batters use the same season's batting weights. Intentional walks are excluded. Every needed contact value must be available.
wOBA − MLBDB xwOBA: Opponents' Weighted Average Minus Expected. Recorded weighted batting average minus the estimate, using the same completed games and batting weights.
Missing pairs: Opponents' Balls with Incomplete Measurements. Eligible balls missing speed, angle or both. These inputs are not filled in. The affected expected statistic is N/A, and the real appearance remains counted.

Usage shows each pitch type thrown as a share of all pitches. Pitches without a recognized type stay in the total.

Jack Kochanowicz, pitching by season: pitch mixRegular season, oldest first
Season	Team	All pitches	FF %	SI %	SL %	ST %	CH %	Type coverage
2024LAA	LAAAngels	859	6.1%	72.6%	14.1%	4.3%	2.9%	100.0%
2025LAA	LAAAngels	1859	18.7%	47.0%	14.7%	5.5%	14.0%	100.0%
2026LAA	LAAAngels	1106	22.2%	38.2%	16.3%	0.0%	23.2%	100.0%

All pitches: Arsenal Pitches. All pitches actually thrown in the checked games. Automatic balls, automatic strikes and pickoff throws are excluded.
FF %: Four-seam fastball usage, the share of all pitches.
SI %: Sinker usage, the share of all pitches.
SL %: Slider usage, the share of all pitches.
ST %: Sweeper usage, the share of all pitches.
CH %: Changeup usage, the share of all pitches.
Unknown: Pitches with Unknown Type. Pitches without a recognized type label. They remain in the total used for pitch usage percentages.
Type coverage: Pitch Type Coverage. The percentage of delivered pitches with a recognized type label. Pitch labels can be revised later. Missing labels are never guessed. Formula: 100 × pitches with a recognized type ÷ all delivered pitches.

Pitch type

Movement is in inches. Sideways: positive is to the pitcher's right, negative is left, when looking toward home plate. Vertical: positive is upward, negative is downward from the initial flight direction. No-grav removes gravity's effect; it does not mean the ball rose. Counts show how many pitches were measured.

Jack Kochanowicz, pitching by season: four-seam fastball (FF)Regular season, oldest first
Season	Team	FF pitches	FF %	FF mph	FF max mph	FF rpm	FF ext ft	FF side in	FF vert in	FF no-grav in	FF whiff%	FF swings	FF speed count	FF spin count	FF ext count	FF side count	FF vert count	FF no-grav count	Type coverage
2024LAA	LAAAngels	52	6.1%	96.2	98.7	2164	6.4	9.3	-16.2	13.3	36.4%	22	52	52	52	52	52	52	100.0%
2025LAA	LAAAngels	348	18.7%	95.5	99.1	2249	6.4	7.1	-15.9	14.2	25.3%	162	348	348	348	348	348	348	100.0%
2026LAA	LAAAngels	246	22.2%	96.2	98.7	2285	6.3	6.8	-15.9	13.7	18.6%	113	246	246	246	246	246	246	100.0%

FF pitches: Four-seam fastball pitches. Number of delivered pitches with this recorded type. Zero means no pitch was recorded with this label.
FF %: Four-seam fastball usage. The percentage of all delivered pitches recorded as this type. Pitches with unknown types stay in the total. These percentages describe the recorded labels, so check type coverage. Formula: 100 × pitches of this recorded type ÷ all delivered pitches.
FF mph: Four-seam fastball average speed. Average recorded speed in miles per hour. Only pitches with a usable speed measurement are included. Speed count shows how many were measured. Formula: Sum of recorded speeds ÷ pitches with speed measurements.
FF max mph: Four-seam fastball fastest recorded pitch. Highest recorded speed in miles per hour. This uses available measurements and may miss a faster pitch that was not measured.
FF rpm: Four-seam fastball average spin. How fast the ball spins, measured in turns per minute. Only measured pitches are included. More spin is not always better. Formula: Sum of recorded spin rates ÷ pitches with spin measurements.
FF ext ft: Four-seam fastball average extension. How far toward home plate the pitcher releases the ball, measured in feet from the pitching rubber. Only pitches with this measurement are included. Formula: Sum of recorded extensions ÷ pitches with extension measurements.
FF side in: Four-seam fastball average sideways movement. Average sideways bend from the pitch's initial flight direction, in inches. Positive is to the pitcher's right when looking toward home plate; negative is left. This direction stays the same for left- and right-handed pitchers. Zero is a real measurement. More movement is not automatically better. Formula: Sum of recorded sideways movement ÷ pitches with sideways movement measured.
FF vert in: Four-seam fastball average vertical movement with gravity. Average upward or downward bend from the pitch's initial flight direction, in inches. Includes gravity. Positive is upward; negative is downward. This is not the change in height from the pitcher's hand to the plate. Only measured pitches are included. Formula: Sum of recorded vertical movement including gravity ÷ pitches with this measurement.
FF no-grav in: Four-seam fastball average vertical movement without gravity. Average vertical bend in inches after removing gravity's downward effect. Positive is upward; negative is downward. A positive number does not mean the ball actually rose on its way to the plate. Only measured pitches are included. Formula: Sum of recorded vertical movement with gravity removed ÷ pitches with this measurement.
FF whiff%: Four-seam fastball misses per swing. The percentage of swings that miss. Caught foul tips count as misses; ordinary fouls count as contact. N/A means no swings or an unclear pitch result. Formula: 100 × missed swings ÷ swings at this pitch type.
FF swings: Four-seam fastball swings. Recorded swings at this type of pitch, including bunts.
FF speed count: Four-seam fastball pitches with speed. Number of pitches with a usable speed measurement. This is the sample behind average speed.
FF spin count: Four-seam fastball pitches with spin. Number of pitches with a usable spin measurement. This is the sample behind average spin.
FF ext count: Four-seam fastball pitches with extension. Number of pitches with a usable release extension measurement. This is the sample behind average extension.
FF side count: Four-seam fastball pitches with sideways movement. Number of pitches with sideways movement recorded. This is the sample behind average sideways movement. Missing measurements are left out; recorded zeroes are included.
FF vert count: Four-seam fastball pitches with vertical movement. Number of pitches with vertical movement including gravity recorded. This is the sample behind that average. Missing measurements are left out; recorded zeroes are included.
FF no-grav count: Four-seam fastball pitches with vertical movement without gravity. Number of pitches with vertical movement recorded after gravity's effect is removed. This is the sample behind that average. Missing measurements are left out; recorded zeroes are included.
Type coverage: Pitch Type Coverage. The percentage of delivered pitches with a recognized type label. Pitch labels can be revised later. Missing labels are never guessed. Formula: 100 × pitches with a recognized type ÷ all delivered pitches.

Jack Kochanowicz, pitching by season: sinker (SI)Regular season, oldest first
Season	Team	SI pitches	SI %	SI mph	SI max mph	SI rpm	SI ext ft	SI side in	SI vert in	SI no-grav in	SI whiff%	SI swings	SI speed count	SI spin count	SI ext count	SI side count	SI vert count	SI no-grav count	Type coverage
2024LAA	LAAAngels	624	72.6%	95.8	98.5	2044	6.5	15.4	-27.0	2.7	12.0%	349	624	624	624	624	624	624	100.0%
2025LAA	LAAAngels	874	47.0%	95.5	99.8	2137	6.4	14.2	-27.0	3.0	14.5%	427	874	874	874	874	874	874	100.0%
2026LAA	LAAAngels	423	38.2%	95.7	98.9	2136	6.3	13.0	-25.2	4.6	16.9%	195	423	423	423	423	423	423	100.0%

SI pitches: Sinker pitches. Number of delivered pitches with this recorded type. Zero means no pitch was recorded with this label.
SI %: Sinker usage. The percentage of all delivered pitches recorded as this type. Pitches with unknown types stay in the total. These percentages describe the recorded labels, so check type coverage. Formula: 100 × pitches of this recorded type ÷ all delivered pitches.
SI mph: Sinker average speed. Average recorded speed in miles per hour. Only pitches with a usable speed measurement are included. Speed count shows how many were measured. Formula: Sum of recorded speeds ÷ pitches with speed measurements.
SI max mph: Sinker fastest recorded pitch. Highest recorded speed in miles per hour. This uses available measurements and may miss a faster pitch that was not measured.
SI rpm: Sinker average spin. How fast the ball spins, measured in turns per minute. Only measured pitches are included. More spin is not always better. Formula: Sum of recorded spin rates ÷ pitches with spin measurements.
SI ext ft: Sinker average extension. How far toward home plate the pitcher releases the ball, measured in feet from the pitching rubber. Only pitches with this measurement are included. Formula: Sum of recorded extensions ÷ pitches with extension measurements.
SI side in: Sinker average sideways movement. Average sideways bend from the pitch's initial flight direction, in inches. Positive is to the pitcher's right when looking toward home plate; negative is left. This direction stays the same for left- and right-handed pitchers. Zero is a real measurement. More movement is not automatically better. Formula: Sum of recorded sideways movement ÷ pitches with sideways movement measured.
SI vert in: Sinker average vertical movement with gravity. Average upward or downward bend from the pitch's initial flight direction, in inches. Includes gravity. Positive is upward; negative is downward. This is not the change in height from the pitcher's hand to the plate. Only measured pitches are included. Formula: Sum of recorded vertical movement including gravity ÷ pitches with this measurement.
SI no-grav in: Sinker average vertical movement without gravity. Average vertical bend in inches after removing gravity's downward effect. Positive is upward; negative is downward. A positive number does not mean the ball actually rose on its way to the plate. Only measured pitches are included. Formula: Sum of recorded vertical movement with gravity removed ÷ pitches with this measurement.
SI whiff%: Sinker misses per swing. The percentage of swings that miss. Caught foul tips count as misses; ordinary fouls count as contact. N/A means no swings or an unclear pitch result. Formula: 100 × missed swings ÷ swings at this pitch type.
SI swings: Sinker swings. Recorded swings at this type of pitch, including bunts.
SI speed count: Sinker pitches with speed. Number of pitches with a usable speed measurement. This is the sample behind average speed.
SI spin count: Sinker pitches with spin. Number of pitches with a usable spin measurement. This is the sample behind average spin.
SI ext count: Sinker pitches with extension. Number of pitches with a usable release extension measurement. This is the sample behind average extension.
SI side count: Sinker pitches with sideways movement. Number of pitches with sideways movement recorded. This is the sample behind average sideways movement. Missing measurements are left out; recorded zeroes are included.
SI vert count: Sinker pitches with vertical movement. Number of pitches with vertical movement including gravity recorded. This is the sample behind that average. Missing measurements are left out; recorded zeroes are included.
SI no-grav count: Sinker pitches with vertical movement without gravity. Number of pitches with vertical movement recorded after gravity's effect is removed. This is the sample behind that average. Missing measurements are left out; recorded zeroes are included.
Type coverage: Pitch Type Coverage. The percentage of delivered pitches with a recognized type label. Pitch labels can be revised later. Missing labels are never guessed. Formula: 100 × pitches with a recognized type ÷ all delivered pitches.

Jack Kochanowicz, pitching by season: slider (SL)Regular season, oldest first
Season	Team	SL pitches	SL %	SL mph	SL max mph	SL rpm	SL ext ft	SL side in	SL vert in	SL no-grav in	SL whiff%	SL swings	SL speed count	SL spin count	SL ext count	SL side count	SL vert count	SL no-grav count	Type coverage
2024LAA	LAAAngels	121	14.1%	85.4	89.5	2725	6.4	-7.2	-37.8	-0.3	27.0%	63	121	121	121	121	121	121	100.0%
2025LAA	LAAAngels	273	14.7%	87.3	91.5	2732	6.4	-3.3	-36.7	-0.7	26.7%	101	273	273	273	273	273	273	100.0%
2026LAA	LAAAngels	180	16.3%	85.6	89.6	2824	6.3	-5.8	-41.3	-4.0	37.5%	56	180	180	180	180	180	180	100.0%

SL pitches: Slider pitches. Number of delivered pitches with this recorded type. Zero means no pitch was recorded with this label.
SL %: Slider usage. The percentage of all delivered pitches recorded as this type. Pitches with unknown types stay in the total. These percentages describe the recorded labels, so check type coverage. Formula: 100 × pitches of this recorded type ÷ all delivered pitches.
SL mph: Slider average speed. Average recorded speed in miles per hour. Only pitches with a usable speed measurement are included. Speed count shows how many were measured. Formula: Sum of recorded speeds ÷ pitches with speed measurements.
SL max mph: Slider fastest recorded pitch. Highest recorded speed in miles per hour. This uses available measurements and may miss a faster pitch that was not measured.
SL rpm: Slider average spin. How fast the ball spins, measured in turns per minute. Only measured pitches are included. More spin is not always better. Formula: Sum of recorded spin rates ÷ pitches with spin measurements.
SL ext ft: Slider average extension. How far toward home plate the pitcher releases the ball, measured in feet from the pitching rubber. Only pitches with this measurement are included. Formula: Sum of recorded extensions ÷ pitches with extension measurements.
SL side in: Slider average sideways movement. Average sideways bend from the pitch's initial flight direction, in inches. Positive is to the pitcher's right when looking toward home plate; negative is left. This direction stays the same for left- and right-handed pitchers. Zero is a real measurement. More movement is not automatically better. Formula: Sum of recorded sideways movement ÷ pitches with sideways movement measured.
SL vert in: Slider average vertical movement with gravity. Average upward or downward bend from the pitch's initial flight direction, in inches. Includes gravity. Positive is upward; negative is downward. This is not the change in height from the pitcher's hand to the plate. Only measured pitches are included. Formula: Sum of recorded vertical movement including gravity ÷ pitches with this measurement.
SL no-grav in: Slider average vertical movement without gravity. Average vertical bend in inches after removing gravity's downward effect. Positive is upward; negative is downward. A positive number does not mean the ball actually rose on its way to the plate. Only measured pitches are included. Formula: Sum of recorded vertical movement with gravity removed ÷ pitches with this measurement.
SL whiff%: Slider misses per swing. The percentage of swings that miss. Caught foul tips count as misses; ordinary fouls count as contact. N/A means no swings or an unclear pitch result. Formula: 100 × missed swings ÷ swings at this pitch type.
SL swings: Slider swings. Recorded swings at this type of pitch, including bunts.
SL speed count: Slider pitches with speed. Number of pitches with a usable speed measurement. This is the sample behind average speed.
SL spin count: Slider pitches with spin. Number of pitches with a usable spin measurement. This is the sample behind average spin.
SL ext count: Slider pitches with extension. Number of pitches with a usable release extension measurement. This is the sample behind average extension.
SL side count: Slider pitches with sideways movement. Number of pitches with sideways movement recorded. This is the sample behind average sideways movement. Missing measurements are left out; recorded zeroes are included.
SL vert count: Slider pitches with vertical movement. Number of pitches with vertical movement including gravity recorded. This is the sample behind that average. Missing measurements are left out; recorded zeroes are included.
SL no-grav count: Slider pitches with vertical movement without gravity. Number of pitches with vertical movement recorded after gravity's effect is removed. This is the sample behind that average. Missing measurements are left out; recorded zeroes are included.
Type coverage: Pitch Type Coverage. The percentage of delivered pitches with a recognized type label. Pitch labels can be revised later. Missing labels are never guessed. Formula: 100 × pitches with a recognized type ÷ all delivered pitches.

Jack Kochanowicz, pitching by season: sweeper (ST)Regular season, oldest first
Season	Team	ST pitches	ST %	ST mph	ST max mph	ST rpm	ST ext ft	ST side in	ST vert in	ST no-grav in	ST whiff%	ST swings	ST speed count	ST spin count	ST ext count	ST side count	ST vert count	ST no-grav count	Type coverage
2024LAA	LAAAngels	37	4.3%	83.7	88.2	2784	6.4	-14.2	-41.9	-2.8	15.4%	13	37	37	37	37	37	37	100.0%
2025LAA	LAAAngels	103	5.5%	82.4	88.2	2838	6.4	-13.2	-43.8	-3.2	22.0%	41	103	103	103	103	103	103	100.0%
2026LAA	LAAAngels	0	0.0%	N/A	N/A	N/A	N/A	N/A	N/A	N/A	N/A	0	0	0	0	0	0	0	100.0%

ST pitches: Sweeper pitches. Number of delivered pitches with this recorded type. Zero means no pitch was recorded with this label.
ST %: Sweeper usage. The percentage of all delivered pitches recorded as this type. Pitches with unknown types stay in the total. These percentages describe the recorded labels, so check type coverage. Formula: 100 × pitches of this recorded type ÷ all delivered pitches.
ST mph: Sweeper average speed. Average recorded speed in miles per hour. Only pitches with a usable speed measurement are included. Speed count shows how many were measured. Formula: Sum of recorded speeds ÷ pitches with speed measurements.
ST max mph: Sweeper fastest recorded pitch. Highest recorded speed in miles per hour. This uses available measurements and may miss a faster pitch that was not measured.
ST rpm: Sweeper average spin. How fast the ball spins, measured in turns per minute. Only measured pitches are included. More spin is not always better. Formula: Sum of recorded spin rates ÷ pitches with spin measurements.
ST ext ft: Sweeper average extension. How far toward home plate the pitcher releases the ball, measured in feet from the pitching rubber. Only pitches with this measurement are included. Formula: Sum of recorded extensions ÷ pitches with extension measurements.
ST side in: Sweeper average sideways movement. Average sideways bend from the pitch's initial flight direction, in inches. Positive is to the pitcher's right when looking toward home plate; negative is left. This direction stays the same for left- and right-handed pitchers. Zero is a real measurement. More movement is not automatically better. Formula: Sum of recorded sideways movement ÷ pitches with sideways movement measured.
ST vert in: Sweeper average vertical movement with gravity. Average upward or downward bend from the pitch's initial flight direction, in inches. Includes gravity. Positive is upward; negative is downward. This is not the change in height from the pitcher's hand to the plate. Only measured pitches are included. Formula: Sum of recorded vertical movement including gravity ÷ pitches with this measurement.
ST no-grav in: Sweeper average vertical movement without gravity. Average vertical bend in inches after removing gravity's downward effect. Positive is upward; negative is downward. A positive number does not mean the ball actually rose on its way to the plate. Only measured pitches are included. Formula: Sum of recorded vertical movement with gravity removed ÷ pitches with this measurement.
ST whiff%: Sweeper misses per swing. The percentage of swings that miss. Caught foul tips count as misses; ordinary fouls count as contact. N/A means no swings or an unclear pitch result. Formula: 100 × missed swings ÷ swings at this pitch type.
ST swings: Sweeper swings. Recorded swings at this type of pitch, including bunts.
ST speed count: Sweeper pitches with speed. Number of pitches with a usable speed measurement. This is the sample behind average speed.
ST spin count: Sweeper pitches with spin. Number of pitches with a usable spin measurement. This is the sample behind average spin.
ST ext count: Sweeper pitches with extension. Number of pitches with a usable release extension measurement. This is the sample behind average extension.
ST side count: Sweeper pitches with sideways movement. Number of pitches with sideways movement recorded. This is the sample behind average sideways movement. Missing measurements are left out; recorded zeroes are included.
ST vert count: Sweeper pitches with vertical movement. Number of pitches with vertical movement including gravity recorded. This is the sample behind that average. Missing measurements are left out; recorded zeroes are included.
ST no-grav count: Sweeper pitches with vertical movement without gravity. Number of pitches with vertical movement recorded after gravity's effect is removed. This is the sample behind that average. Missing measurements are left out; recorded zeroes are included.
Type coverage: Pitch Type Coverage. The percentage of delivered pitches with a recognized type label. Pitch labels can be revised later. Missing labels are never guessed. Formula: 100 × pitches with a recognized type ÷ all delivered pitches.

Jack Kochanowicz, pitching by season: changeup (CH)Regular season, oldest first
Season	Team	CH pitches	CH %	CH mph	CH max mph	CH rpm	CH ext ft	CH side in	CH vert in	CH no-grav in	CH whiff%	CH swings	CH speed count	CH spin count	CH ext count	CH side count	CH vert count	CH no-grav count	Type coverage
2024LAA	LAAAngels	25	2.9%	88.2	90.7	2058	6.6	11.2	-31.6	3.5	7.1%	14	25	25	25	25	25	25	100.0%
2025LAA	LAAAngels	261	14.0%	89.9	92.9	2109	6.4	9.2	-31.3	2.5	29.4%	153	261	261	261	261	261	261	100.0%
2026LAA	LAAAngels	257	23.2%	89.9	93.4	2172	6.3	10.3	-32.8	0.9	31.6%	136	257	257	257	257	257	257	100.0%

CH pitches: Changeup pitches. Number of delivered pitches with this recorded type. Zero means no pitch was recorded with this label.
CH %: Changeup usage. The percentage of all delivered pitches recorded as this type. Pitches with unknown types stay in the total. These percentages describe the recorded labels, so check type coverage. Formula: 100 × pitches of this recorded type ÷ all delivered pitches.
CH mph: Changeup average speed. Average recorded speed in miles per hour. Only pitches with a usable speed measurement are included. Speed count shows how many were measured. Formula: Sum of recorded speeds ÷ pitches with speed measurements.
CH max mph: Changeup fastest recorded pitch. Highest recorded speed in miles per hour. This uses available measurements and may miss a faster pitch that was not measured.
CH rpm: Changeup average spin. How fast the ball spins, measured in turns per minute. Only measured pitches are included. More spin is not always better. Formula: Sum of recorded spin rates ÷ pitches with spin measurements.
CH ext ft: Changeup average extension. How far toward home plate the pitcher releases the ball, measured in feet from the pitching rubber. Only pitches with this measurement are included. Formula: Sum of recorded extensions ÷ pitches with extension measurements.
CH side in: Changeup average sideways movement. Average sideways bend from the pitch's initial flight direction, in inches. Positive is to the pitcher's right when looking toward home plate; negative is left. This direction stays the same for left- and right-handed pitchers. Zero is a real measurement. More movement is not automatically better. Formula: Sum of recorded sideways movement ÷ pitches with sideways movement measured.
CH vert in: Changeup average vertical movement with gravity. Average upward or downward bend from the pitch's initial flight direction, in inches. Includes gravity. Positive is upward; negative is downward. This is not the change in height from the pitcher's hand to the plate. Only measured pitches are included. Formula: Sum of recorded vertical movement including gravity ÷ pitches with this measurement.
CH no-grav in: Changeup average vertical movement without gravity. Average vertical bend in inches after removing gravity's downward effect. Positive is upward; negative is downward. A positive number does not mean the ball actually rose on its way to the plate. Only measured pitches are included. Formula: Sum of recorded vertical movement with gravity removed ÷ pitches with this measurement.
CH whiff%: Changeup misses per swing. The percentage of swings that miss. Caught foul tips count as misses; ordinary fouls count as contact. N/A means no swings or an unclear pitch result. Formula: 100 × missed swings ÷ swings at this pitch type.
CH swings: Changeup swings. Recorded swings at this type of pitch, including bunts.
CH speed count: Changeup pitches with speed. Number of pitches with a usable speed measurement. This is the sample behind average speed.
CH spin count: Changeup pitches with spin. Number of pitches with a usable spin measurement. This is the sample behind average spin.
CH ext count: Changeup pitches with extension. Number of pitches with a usable release extension measurement. This is the sample behind average extension.
CH side count: Changeup pitches with sideways movement. Number of pitches with sideways movement recorded. This is the sample behind average sideways movement. Missing measurements are left out; recorded zeroes are included.
CH vert count: Changeup pitches with vertical movement. Number of pitches with vertical movement including gravity recorded. This is the sample behind that average. Missing measurements are left out; recorded zeroes are included.
CH no-grav count: Changeup pitches with vertical movement without gravity. Number of pitches with vertical movement recorded after gravity's effect is removed. This is the sample behind that average. Missing measurements are left out; recorded zeroes are included.
Type coverage: Pitch Type Coverage. The percentage of delivered pitches with a recognized type label. Pitch labels can be revised later. Missing labels are never guessed. Formula: 100 × pitches with a recognized type ÷ all delivered pitches.

Last 5 games

Jack Kochanowicz, pitching in the last 5 gamesNewest first
Date	Game	Result	IP	H	R	ER	BB	SO
Jun 6	@ LAD@ Los Angeles Dodgers	L 2-9	0.1	6	7	7	1	1
May 31	@ TB@ Tampa Bay Rays	L 2-5	2.1	5	3	3	4	1
May 26	@ DET@ Detroit Tigers	W 10-6	4.0	6	5	5	2	4
May 20	vs ATHvs Athletics	L 5-6	6.0	3	3	3	4	7
May 15	vs LADvs Los Angeles Dodgers	L 0-6	6.0	7	6	6	2	4

Bio

Full name: Jack Von Kochanowicz
Position: Pitcher (P)
Bats / Throws: L / R
Height / Weight: 6' 7", 228 lb
Number: 41
Born: Dec 22, 2000, Philadelphia, PA, United States
Age: 25
MLB debut: Jul 11, 2024
Draft: 2019 draft, round 3, pick 92, Los Angeles Angels
School: Harriton HS

Trade & Transaction History

4 recorded moves.

Jun 10, 2026

Status Change

Los Angeles Angels transferred RHP Jack Kochanowicz from the 15-day injured list to the 60-day injured list. Right elbow inflammation.

To Los Angeles Angels

Jun 7, 2026

Status Change

Los Angeles Angels placed RHP Jack Kochanowicz on the 15-day injured list. Right elbow inflammation.

To Los Angeles Angels

Apr 16, 2026

Number Change

RHP Jack Kochanowicz changed number to 41.

To Los Angeles Angels

Apr 15, 2026

Number Change

RHP Jack Kochanowicz changed number to 42.

To Los Angeles Angels