ISOLATED POWER (ISO)

Isolated Power [ISO]
A player's slugging average minus his batting average. Bill James provided its current name. Branch Rickey championed the stat, calling it "Power Average." A measure of a player's ability to hit for power considered apart from his ability to hit singles.

ISO= SLG - AVG

For an individual, ISO under .080 means he can be considered a singles hitter; ISO over .200 is very good power.


SEASON
MODERN (1900-)
ALL- TIME
CAREER


ISOLATED POWER
1 Babe Ruth .348
2 Mark McGwire .325
3 Barry Bonds .305
4 Lou Gehrig .292
5 Hank Greenberg .292
6 Ted Williams .289
7 Jimmie Foxx .284
8 Jim Thome .283
9 Manny Ramirez .281
10 Albert Pujols .279
11 Todd Helton .279
12 Carlos Delgado .275
13 Alex Rodriguez .273
14 Ralph Kiner .269
15 Albert Belle .269
16 Sammy Sosa .268
17 Ken Griffey Jr. .268
18 Juan Gonzalez .267
19 Vladimir Guerrero .265
20 Lance Berkman .262
21 Brian Giles .261
22 Mike Schmidt .260
23 Mickey Mantle .259
24 Frank Thomas .258
25 Willie Mays .256
26 Joe DiMaggio .254
27 Richie Sexson .254
28 Larry Walker .253
29 Harmon Killebrew .252
30 Mike Piazza .252
31 Johnny Mize .250
32 Hank Aaron .250
33 Jeff Bagwell .249
34 Jose Canseco .249
35 Jason Giambi .247
36 Willie Stargell .247
37 Darryl Strawberry .247
38 Willie McCovey .245
39 Russ Branyan .245
40 Duke Snider .244
41 Adam Dunn .243
42 Frank Robinson .243
43 Dave Kingman .242
44 Dick Allen .242
45 Ken Phelps .241
46 Jim Edmonds .240
47 Jay Buhner .240
48 Ryan Klesko .239
49 Troy Glaus .239
50 Eddie Mathews .238

ALL TIME
SINGLE SEASON

ISOLATED POWER YEAR
1 Barry Bonds 2001 .536
2 Babe Ruth 1920 .472
3 Babe Ruth 1921 .469
4 Mark McGwire 1998 .454
5 Barry Bonds 2002 .429
6 Mark McGwire 1996 .418
7 Mark McGwire 1999 .418
8 Babe Ruth 1927 .417
9 Sammy Sosa 2001 .409
10 Barry Bonds 2003 .408
11 Lou Gehrig 1927 .392
12 Babe Ruth 1928 .386
13 Jimmie Foxx 1932 .385
14 Barry Bonds 2000 .381
15 Frank Thomas 1994 .376
16 Albert Belle 1995 .374
17 Jim Thome 2002 .373
18 Babe Ruth 1930 .373
19 Mark McGwire 1997 .372
20 Babe Ruth 1923 .372
21 Mickey Mantle 1961 .370
22 Hank Greenberg 1938 .369
23 Hack Wilson 1930 .368
24 Babe Ruth 1926 .366
25 Luis Gonzalez 2001 .363
26 Babe Ruth 1924 .361
27 Jimmie Foxx 1938 .356
28 Larry Walker 1997 .354
29 Rogers Hornsby 1925 .353
30 Mickey Mantle 1956 .353
31 Babe Ruth 1929 .353
32 Roger Maris 1961 .351
33 Todd Helton 2001 .349
34 Ralph Kiner 1949 .348
35 Jimmie Foxx 1933 .347
36 Sammy Sosa 1999 .347
37 Willie Stargell 1973 .347
38 Manny Ramirez 2000 .346
39 Kevin Mitchell 1989 .344
40 Lou Gehrig 1934 .344
41 Jim Gentile 1961 .344
42 Ted Williams 1957 .343
43 Lou Gehrig 1930 .343
44 Jim Edmonds 2003 .342
45 Ken Griffey Jr. 1997 .342
46 Lou Gehrig 1936 .342
47 Hank Aaron 1971 .341
48 Barry Bonds 1993 .341
49 Brady Anderson 1996 .340
50 Willie Mays 1955 .340
51 Sammy Sosa 1998 .339
52 Mike Schmidt 1980 .338
53 Willie McCovey 1969 .336
54 Babe Ruth 1919 .336
55 Jimmie Foxx 1939 .334
56 Reggie Jackson 1969 .333
57 Jim Thome 2001 .333
58 Willie Stargell 1971 .333
59 Hank Greenberg 1937 .332
60 Larry Walker 1999 .331
61 Hank Greenberg 1940 .330
62 Manny Ramirez 1999 .330
63 Juan Gonzalez 1996 .329
64 Ted Williams 1941 .329
65 Mark McGwire 1987 .329
66 Willie Mays 1965 .328
67 Babe Ruth 1931 .328
68 Ken Griffey Jr. 1998 .327
69 Hank Greenberg 1946 .327
70 Joe DiMaggio 1937 .327
71 Albert Belle 1998 .327
72 Al Simmons 1930 .327
73 Todd Helton 2000 .326
74 Stan Musial 1948 .326
75 Ralph Kiner 1947 .326
76 Dave Kingman 1979 .325
77 Ted Williams 1946 .325
78 Ken Griffey Jr. 1996 .325
79 Eddie Mathews 1953 .325
80 Greg Vaughn 1998 .325
81 Brian Giles 2002 .324
82 Alex Rodriguez 2002 .324
83 Willie McCovey 1970 .323
84 Juan Gonzalez 1993 .323
85 Richard Hidalgo 2000 .323
86 Willie Mays 1954 .322
87 Lou Gehrig 1931 .321
88 Johnny Mize 1940 .321
89 Frank Robinson 1966 .321
90 Rogers Hornsby 1922 .321
91 Carlos Delgado 2000 .320
92 Troy Glaus 2000 .320
93 Duke Snider 1955 .320
94 Babe Ruth 1932 .319
95 Jimmie Foxx 1934 .319
96 Vladimir Guerrero 2000 .319
97 Ralph Kiner 1951 .318
98 Ralph Kiner 1950 .318
99 Harmon Killebrew 1961 .318
100 Gary Sheffield 2000 .317


SEASON
2004
ISOLATED POWER ISO
1 Barry Bonds .450
2 Jim Edmonds .341
3 Albert Pujols .326
4 Jim Thome .307
5 Manny Ramirez .305
6 Adam Dunn .303
7 David Ortiz .302
8 Adrian Beltre .294
9 Scott Rolen .284
10 Carlos Beltran .280
11 Mark Teixeira .279
12 Jeromy Burnitz .276
13 Todd Helton .272
14 Travis Hafner .272
15 Carlos Delgado .266
16 Moises Alou .265
17 J.D. Drew .264
18 Vinny Castilla .264
19 Sammy Sosa .264
20 Vladimir Guerrero .261
21 Aramis Ramirez .260
22 Jose Valentin .258
23 Paul Konerko .258
24 Lance Berkman .250
25 Mike Cameron .247



SEASON
2003

ISOLATED POWER
1 Barry Bonds .408
2 Jim Edmonds .342
3 Albert Pujols .308
4 Jim Thome .306
5 David Ortiz .304
6 Alex Rodriguez .301
7 Frank Thomas .295
8 Carlos Delgado .291
9 Jason Giambi .277
10 Richie Sexson .276
11 Sammy Sosa .275
12 Gary Sheffield .274
13 Trot Nixon .272
14 Todd Helton .271
15 Richard Hidalgo .263
16 Manny Ramirez .262
17 Jose Guillen .258
18 Preston Wilson .255
19 Mike Lowell .254
20 Jeromy Burnitz .248
21 Rafael Palmeiro .248
22 Jeff Bagwell .246
23 Aubrey Huff .244
24 Geoff Jenkins .242
25 Scott Rolen .242


SEASON
2002

ISOLATED POWER
1 Barry Bonds .429
2 Jim Thome .373
3 Brian Giles .324
4 Alex Rodriguez .324
5 Sammy Sosa .306
6 Rafael Palmeiro .299
7 Manny Ramirez .298
8 Lance Berkman .285
9 Jason Giambi .284
10 Magglio Ordonez .276
11 Shawn Green .273
12 Carlos Delgado .271
13 Larry Walker .264
14 Mike Piazza .264
15 Pat Burrell .263
16 Vladimir Guerrero .257
17 Mark Bellhorn .254
18 Jeff Kent .252
19 Jim Edmonds .250
20 Andruw Jones .248
21 Todd Helton .248
22 Albert Pujols .247
23 Alfonso Soriano .247
24 Cliff Floyd .244
25 Raul Ibanez .243


SEASON
2001

ISOLATED POWER
1 Barry Bonds .536
2 Sammy Sosa .409
3 Luis Gonzalez .363
4 Todd Helton .349
5 Jim Thome .333
6 Jason Giambi .317
7 Larry Walker .312
8 Alex Rodriguez .304
9 Manny Ramirez .302
10 Shawn Green .300
11 Rafael Palmeiro .290
12 Lance Berkman .289
13 Phil Nevin .282
14 Albert Pujols .281
15 Brian Giles .281
16 Troy Glaus .281
17 Jeff Bagwell .280
18 Richie Sexson .276
19 Chipper Jones .274
20 Mike Piazza .272
21 Gary Sheffield .272
22 Juan Gonzalez .265
23 Ellis Burks .262
24 Carlos Delgado .261
25 Cliff Floyd .261


SEASON
2000

ISOLATED POWER
1 Barry Bonds .381
2 Manny Ramirez .346
3 Todd Helton .326
4 Richard Hidalgo .323
5 Carlos Delgado .320
6 Troy Glaus .320
7 Vladimir Guerrero .319
8 Gary Sheffield .317
9 Sammy Sosa .315
10 Jason Giambi .314
11 Jeff Bagwell .305
12 David Justice .298
13 Frank Thomas .297
14 Alex Rodriguez .291
15 Mike Piazza .290
16 Jim Edmonds .288
17 Carl Everett .286
18 Geoff Jenkins .285
19 Ken Griffey Jr. .285
20 Brian Giles .279
21 Rafael Palmeiro .269
22 Moises Alou .269
23 Brad Fullmer .263
24 Steve Finley .263
25 Jeff Kent .262