MLB Relative Power Index (RPI) - 2021

Season:
MLB RPI Rankings
RK TEAM RPI W L PCT SOS PWR RS RA EXPW-L EXPWP
1 Boston Red Sox .526 21 13 .618 .496 0 183 148 21-13 .605
2 Chicago White Sox .526 18 13 .581 .508 0 155 108 21-10 .673
3 Philadelphia Phillies .524 18 16 .529 .522 0 144 147 17-17 .490
4 New York Mets .524 15 13 .536 .520 0 97 102 13-15 .475
5 San Francisco Giants .524 20 13 .606 .496 0 150 113 21-12 .638
6 Tampa Bay Rays .519 18 17 .514 .520 0 149 149 18-18 .500
7 St. Louis Cardinals .519 20 14 .588 .495 0 159 138 19-15 .570
8 Toronto Blue Jays .516 17 15 .531 .511 0 156 128 19-13 .598
9 Seattle Mariners .516 18 16 .529 .511 0 140 147 16-18 .476
10 Oakland Athletics .513 21 14 .600 .484 0 147 156 16-19 .470
11 Baltimore Orioles .512 15 18 .455 .531 0 128 143 15-18 .445
12 Milwaukee Brewers .511 18 16 .529 .505 0 132 139 16-18 .474
13 San Diego Padres .510 18 16 .529 .503 0 128 119 18-16 .536
14 Houston Astros .509 17 16 .515 .508 0 165 135 20-13 .599
15 Miami Marlins .507 15 17 .469 .520 0 135 114 19-13 .584
16 Cleveland Indians .505 18 14 .563 .486 0 136 121 18-14 .558
17 Los Angeles Dodgers .504 18 16 .529 .495 0 173 140 21-13 .604
18 Cincinnati Reds .502 15 16 .484 .508 0 157 161 15-16 .487
19 Atlanta Braves .500 16 17 .485 .505 0 153 170 15-18 .448
20 Texas Rangers .498 17 18 .486 .502 0 148 160 16-19 .461
21 New York Yankees .498 17 16 .515 .492 0 135 123 18-15 .546
22 Washington Nationals .491 13 16 .448 .505 0 107 123 12-17 .431
23 Chicago Cubs .489 17 16 .515 .481 0 152 156 16-17 .487
24 Los Angeles Angels .489 14 18 .438 .507 0 155 183 13-19 .418
25 Kansas City Royals .485 16 16 .500 .479 0 134 159 13-19 .415
26 Arizona Diamondbacks .475 15 18 .455 .482 0 160 173 15-18 .461
27 Colorado Rockies .468 12 21 .364 .503 0 159 181 14-19 .436
28 Pittsburgh Pirates .460 13 19 .406 .478 0 110 141 12-20 .378
29 Minnesota Twins .454 12 20 .375 .480 0 150 152 16-16 .493
30 Detroit Tigers .438 10 24 .294 .486 0 111 179 9-25 .278
Glossary
  • W: Wins
  • L: Losses
  • PCT: Winning percentage
  • RPI: Relative Power Index+
  • SOS: Strength of schedule
  • PWR: ESPN Power Ranking
  • RS: Runs scored
  • RA: Runs allowed
  • EXW-L: Expected W-L*
  • EXWP: Expected winning percentage*
+The basic formula is 25% team winning percentage, 50% opponents' average winning percentage, and 25% opponents' opponents' average winning percentage.
*ExW-L and ExWP are derived from Bill James' Pythagorean theorem of baseball: Runs scored [squared] / (Runs scored [squared] + runs allowed [squared]). This formula was designed to relate a team's runs scored and runs allowed to its won-lost record.