2015 MLB Relative Power Index (RPI),as of the games of May 26,2015

MLB RPI Rankings
RK	TEAM	RPI	W	L	PCT	SOS	PWR	RS	RA	EXPW-L	EXPWP
1	Detroit Tigers	.548	27	20	.574	.540	4	201	187	25-22	.536
2	Kansas City Royals	.547	28	17	.622	.521	1	213	165	28-17	.625
3	St. Louis Cardinals	.541	30	16	.652	.504	2	198	140	31-15	.667
4	Minnesota Twins	.532	27	18	.600	.509	10	206	187	25-20	.548
5	Houston Astros	.529	30	17	.638	.493	5	209	180	27-20	.574
6	Los Angeles Dodgers	.519	28	17	.622	.485	6	207	153	29-16	.647
7	New York Yankees	.515	24	22	.522	.513	13	213	199	25-21	.534
8	Chicago Cubs	.513	25	20	.556	.499	9	189	185	23-22	.511
9	San Diego Padres	.512	22	25	.468	.526	17	200	210	22-25	.476
10	Washington Nationals	.511	27	19	.587	.486	3	216	191	26-20	.561
11	San Francisco Giants	.511	27	20	.574	.490	7	195	184	25-22	.529
12	New York Mets	.509	26	21	.553	.494	12	173	170	24-23	.509
13	Cleveland Indians	.504	20	25	.444	.524	18	197	207	21-24	.475
14	Pittsburgh Pirates	.500	23	22	.511	.497	15	184	152	27-18	.594
15	Los Angeles Angels	.499	23	23	.500	.499	11	171	178	22-24	.480
16	Seattle Mariners	.499	22	23	.489	.502	16	172	188	21-24	.456
17	Arizona Diamondbacks	.498	21	24	.467	.509	22	210	201	23-22	.522
18	Texas Rangers	.497	23	23	.500	.497	23	210	210	23-23	.500
19	Chicago White Sox	.490	19	24	.442	.506	21	156	204	16-27	.369
20	Tampa Bay Rays	.489	24	23	.511	.481	8	179	169	25-22	.529
21	Toronto Blue Jays	.483	22	26	.458	.491	24	252	225	27-21	.556
22	Baltimore Orioles	.479	20	23	.465	.484	14	187	185	22-21	.505
23	Cincinnati Reds	.479	19	26	.422	.498	25	166	201	18-27	.405
24	Colorado Rockies	.478	18	26	.409	.501	28	188	227	18-26	.407
25	Boston Red Sox	.477	21	25	.457	.483	20	179	217	19-27	.405
26	Oakland Athletics	.475	17	31	.354	.516	29	203	207	24-24	.490
27	Atlanta Braves	.472	22	23	.489	.466	19	182	197	21-24	.460
28	Philadelphia Phillies	.468	19	29	.396	.493	26	153	210	17-31	.347
29	Milwaukee Brewers	.465	16	31	.340	.506	27	177	235	17-30	.362
30	Miami Marlins	.465	18	29	.383	.492	30	176	198	21-26	.441

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.