2015 MLB Relative Power Index (RPI),as of the games of July 9,2015

MLB RPI Rankings
RK	TEAM	RPI	W	L	PCT	SOS	PWR	RS	RA	EXPW-L	EXPWP
1	St. Louis Cardinals	.545	56	30	.651	.509	1	343	247	57-29	.659
2	Kansas City Royals	.536	50	33	.602	.514	5	364	301	49-34	.594
3	Chicago Cubs	.527	46	38	.548	.520	8	331	312	44-40	.530
4	Detroit Tigers	.519	44	41	.518	.520	16	386	389	42-43	.496
5	Pittsburgh Pirates	.518	50	35	.588	.494	3	339	280	51-34	.594
6	Minnesota Twins	.517	46	40	.535	.511	13	359	348	44-42	.516
7	Houston Astros	.512	49	39	.557	.498	2	391	335	51-37	.577
8	New York Yankees	.512	46	39	.541	.502	7	393	371	45-40	.529
9	Los Angeles Angels	.509	46	39	.541	.499	9	351	324	46-39	.540
10	Cleveland Indians	.507	41	44	.482	.515	17	338	358	40-45	.471
11	Los Angeles Dodgers	.506	49	38	.563	.487	6	368	302	52-35	.598
12	Chicago White Sox	.501	39	44	.470	.511	27	285	361	32-51	.384
13	Toronto Blue Jays	.500	44	44	.500	.500	12	470	388	52-36	.595
14	Baltimore Orioles	.499	43	42	.506	.497	11	378	336	47-38	.559
15	Tampa Bay Rays	.498	43	45	.489	.502	14	322	337	42-46	.477
16	Washington Nationals	.498	46	38	.548	.482	4	360	327	46-38	.548
17	Texas Rangers	.496	41	44	.482	.501	15	360	384	40-45	.468
18	Seattle Mariners	.495	40	46	.465	.505	25	301	343	37-49	.435
19	San Diego Padres	.493	39	48	.448	.509	21	341	390	38-49	.433
20	New York Mets	.493	44	42	.512	.487	18	297	305	42-44	.487
21	Arizona Diamondbacks	.493	42	42	.500	.491	20	385	379	43-41	.508
22	Oakland Athletics	.491	39	49	.443	.507	24	382	337	49-39	.562
23	Cincinnati Reds	.490	38	45	.458	.501	22	326	357	38-45	.455
24	Boston Red Sox	.489	41	45	.477	.494	23	364	403	39-47	.449
25	Milwaukee Brewers	.489	37	50	.425	.511	28	348	401	37-50	.430
26	San Francisco Giants	.487	43	43	.500	.483	10	350	342	44-42	.512
27	Atlanta Braves	.481	42	44	.488	.479	19	339	366	40-46	.462
28	Miami Marlins	.475	36	50	.419	.494	26	308	349	38-48	.438
29	Colorado Rockies	.469	36	49	.424	.484	29	370	435	36-49	.420
30	Philadelphia Phillies	.453	29	59	.330	.494	30	299	441	28-60	.315

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.