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Isolated Power 2021

Extra bases per at-bat, separating extra-base power from batting average.

Minimum workload: 3.1 plate appearances per game, rounded to the nearest whole appearance. Completed seasons use the league's scheduled regular-season game count; seasons in progress use team games played. Batting-title exceptions are not applied. Data through December 31, 2021. Data refreshed Mar 13, 2026, 3:23 AM UTC.

Isolated Power2021 season
#PlayerTeamPAABISO
1S. OhtaniLAA639537.335
2F. Tatis Jr.SD546478.328
3B. HarperPHI599488.305
4J. VottoCIN533448.297
5V. Guerrero Jr.TOR698604.290
6M. MuncyLAD592497.278
7B. LoweTB615535.277
8T. O'NeillSTL537482.274
9M. SemienTOR724652.273
10J. RamírezCLE636552.272
11S. PerezKC665620.271
12M. OlsonOAK673565.269
13N. CastellanosCIN585531.267
14A. DuvallATL555513.263
15K. TuckerHOU567506.263
16J. GalloNYY616498.259
17R. DeversBOS664591.259
18P. AlonsoNYM637561.257
19A. JudgeNYY633550.256
20Y. AlvarezHOU598537.253
21C. CronCOL547470.249
22G. StantonNYY579510.243
23M. SanóMIN532470.243
24H. RenfroeBOS572521.242
25N. ArenadoSTL653593.239
26J. PolancoMIN644588.235
27M. YastrzemskiSF532468.233
28M. HanigerSEA691620.232
29R. MountcastleBAL586534.232
30J. WalshLAA585530.232
31N. CruzTB584513.232
32J. MartinezBOS634570.232
33E. SuárezCIN574505.230
34J. BáezNYM547502.229
35O. AlbiesATL686629.229
36A. GarcíaMIL515461.228
37C. MullinsBAL675602.228
38J. DonaldsonMIN543457.228
39T. HernándezTOR595550.227
40A. RileyATL662590.227
41K. SeagerSEA670603.226
42A. MeadowsTB591518.224
43B. CrawfordSF549483.224
44M. BettsLAD550466.223
45A. McCutchenPHI574482.222
46J. SotoWSH654502.221
47P. GoldschmidtSTL679603.221
48T. StoryCOL595526.221
49B. ReynoldsPIT646559.220
50W. AdamesMIL555497.219
ISO
Extra bases per at-bat, separating extra-base power from batting average.

Understanding Isolated Power

Extra bases per at-bat, separating extra-base power from batting average.

Formula: (2B + 2 × 3B + 3 × HR) ÷ AB

Read rates alongside playing time. A small sample can produce an extreme result, and a missing value is different from zero.

Season rankings use regular-season records. A player has one combined row across teams; the team label identifies the associated team, not a separate team stint.

Source: MLB statistics and MLBDB derived measures. Formulas describe the measure above. Data refreshed Mar 13, 2026, 3:23 AM UTC.