2015 MLB Relative Power Index (RPI),as of the games of July 11,2015

MLB RPI Rankings
RK	TEAM	RPI	W	L	PCT	SOS	PWR	RS	RA	EXPW-L	EXPWP
1	St. Louis Cardinals	.541	56	32	.636	.509	1	350	258	57-31	.648
2	Kansas City Royals	.535	51	34	.600	.514	5	369	307	50-35	.591
3	Chicago Cubs	.523	46	40	.535	.519	8	332	318	45-41	.522
4	Minnesota Twins	.520	48	40	.545	.512	13	376	359	46-42	.523
5	Pittsburgh Pirates	.520	52	35	.598	.495	3	350	287	52-35	.598
6	Detroit Tigers	.518	44	43	.506	.522	16	397	406	43-44	.489
7	New York Yankees	.512	47	40	.540	.503	7	401	377	46-41	.531
8	Houston Astros	.510	49	41	.544	.498	2	392	341	51-39	.569
9	Los Angeles Angels	.508	47	40	.540	.498	9	358	332	47-40	.538
10	Cleveland Indians	.506	42	45	.483	.514	17	347	364	41-46	.476
11	Los Angeles Dodgers	.505	50	39	.562	.486	6	372	311	52-37	.589
12	Chicago White Sox	.505	41	44	.482	.512	27	291	362	33-52	.393
13	Tampa Bay Rays	.502	45	45	.500	.503	14	328	338	44-46	.485
14	Toronto Blue Jays	.502	45	45	.500	.503	12	476	393	54-36	.595
15	Baltimore Orioles	.501	44	43	.506	.499	11	385	345	48-39	.555
16	Washington Nationals	.497	47	39	.547	.481	4	369	334	47-39	.550
17	Texas Rangers	.496	42	45	.483	.500	15	369	393	41-46	.469
18	Seattle Mariners	.495	41	47	.466	.505	25	309	350	39-49	.438
19	New York Mets	.495	46	42	.523	.486	18	305	309	43-45	.493
20	San Diego Padres	.493	40	49	.449	.507	21	350	399	39-50	.435
21	Arizona Diamondbacks	.491	42	44	.488	.492	20	389	387	43-43	.503
22	Boston Red Sox	.491	42	46	.477	.496	23	370	411	39-49	.448
23	Oakland Athletics	.491	40	50	.444	.506	24	388	346	50-40	.557
24	Milwaukee Brewers	.490	38	51	.427	.511	28	357	405	39-50	.437
25	San Francisco Giants	.489	45	43	.511	.482	10	373	349	47-41	.533
26	Cincinnati Reds	.489	39	46	.459	.499	22	330	371	38-47	.442
27	Atlanta Braves	.479	42	46	.477	.479	19	344	374	40-48	.458
28	Miami Marlins	.475	37	51	.420	.494	26	322	353	40-48	.454
29	Colorado Rockies	.471	38	49	.437	.483	29	378	440	37-50	.425
30	Philadelphia Phillies	.451	29	61	.322	.494	30	306	464	27-63	.303

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.