Final MLB Relative Power Index (RPI) - 2015

MLB RPI Rankings
RK	TEAM	RPI	W	L	PCT	SOS	PWR	RS	RA	EXPW-L	EXPWP
1	St. Louis Cardinals	.531	100	62	.617	.503	1	647	525	98-64	.603
2	Kansas City Royals	.527	95	67	.586	.507	5	724	641	91-71	.561
3	Chicago Cubs	.526	97	65	.599	.502	4	689	608	91-71	.562
4	Pittsburgh Pirates	.524	98	64	.605	.497	3	697	596	94-68	.578
5	Toronto Blue Jays	.521	93	69	.574	.503	2	891	670	103-59	.639
6	New York Yankees	.513	87	75	.537	.505	9	764	698	88-74	.545
7	Los Angeles Dodgers	.511	92	70	.568	.491	6	667	595	90-72	.557
8	Texas Rangers	.510	88	74	.543	.499	8	751	733	83-79	.512
9	Minnesota Twins	.510	83	79	.512	.509	13	696	700	81-81	.497
10	Los Angeles Angels	.509	85	77	.525	.504	11	661	675	79-83	.490
11	Houston Astros	.508	86	76	.531	.500	10	729	618	94-68	.582
12	Baltimore Orioles	.505	81	81	.500	.507	16	713	693	83-79	.514
13	Cleveland Indians	.505	81	80	.503	.506	15	669	640	84-77	.522
14	New York Mets	.503	90	72	.556	.485	7	683	613	90-72	.554
15	Tampa Bay Rays	.502	80	82	.494	.505	19	644	642	81-81	.502
16	Detroit Tigers	.500	74	87	.460	.514	23	689	803	68-93	.424
17	Chicago White Sox	.500	76	86	.469	.511	22	622	701	71-91	.440
18	Boston Red Sox	.499	78	84	.481	.505	17	748	753	80-82	.497
19	San Francisco Giants	.497	84	78	.519	.490	12	696	627	89-73	.552
20	Seattle Mariners	.495	76	86	.469	.503	20	656	726	73-89	.449
21	Washington Nationals	.493	83	79	.512	.486	14	703	635	89-73	.551
22	Arizona Diamondbacks	.492	79	83	.488	.494	18	720	713	82-80	.505
23	Milwaukee Brewers	.486	68	94	.420	.508	25	655	737	71-91	.441
24	San Diego Padres	.485	74	88	.457	.494	21	650	731	72-90	.442
25	Oakland Athletics	.484	68	94	.420	.505	26	694	729	77-85	.475
26	Cincinnati Reds	.481	64	98	.395	.510	29	640	754	68-94	.419
27	Colorado Rockies	.476	68	94	.420	.495	27	737	844	70-92	.433
28	Miami Marlins	.474	71	91	.438	.486	24	613	678	73-89	.450
29	Atlanta Braves	.469	67	95	.414	.488	28	573	760	59-103	.362
30	Philadelphia Phillies	.464	63	99	.389	.489	30	626	809	61-101	.375

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.