2015 MLB Relative Power Index (RPI),as of the games of July 4,2015

MLB RPI Rankings
RK	TEAM	RPI	W	L	PCT	SOS	PWR	RS	RA	EXPW-L	EXPWP
1	St. Louis Cardinals	.539	52	28	.650	.502	1	317	228	53-27	.659
2	Kansas City Royals	.528	45	33	.577	.512	2	328	283	45-33	.573
3	Chicago Cubs	.522	43	36	.544	.515	10	312	293	42-37	.531
4	Houston Astros	.519	48	35	.578	.500	5	375	317	48-35	.583
5	New York Yankees	.516	44	37	.543	.507	9	378	353	43-38	.534
6	Detroit Tigers	.516	41	39	.513	.517	14	354	361	39-41	.490
7	Minnesota Twins	.512	43	38	.531	.506	13	338	333	41-40	.507
8	Pittsburgh Pirates	.512	46	34	.575	.491	4	323	268	47-33	.592
9	Los Angeles Dodgers	.512	46	36	.561	.495	6	345	280	49-33	.603
10	Los Angeles Angels	.511	43	38	.531	.505	15	324	307	43-38	.527
11	Toronto Blue Jays	.504	42	41	.506	.503	12	450	369	50-33	.598
12	Baltimore Orioles	.503	42	39	.519	.498	11	361	318	46-35	.563
13	Cleveland Indians	.502	38	42	.475	.511	20	322	341	38-42	.471
14	Washington Nationals	.501	45	36	.556	.483	3	355	318	45-36	.555
15	Tampa Bay Rays	.501	42	41	.506	.499	7	298	303	41-42	.492
16	Texas Rangers	.500	41	41	.500	.500	17	348	361	39-43	.482
17	Chicago White Sox	.498	36	42	.462	.510	26	270	342	30-48	.384
18	San Diego Padres	.498	39	44	.470	.507	21	335	377	37-46	.441
19	Seattle Mariners	.496	37	44	.457	.509	24	276	317	35-46	.431
20	Arizona Diamondbacks	.494	40	41	.494	.494	19	370	367	41-40	.504
21	Oakland Athletics	.494	38	46	.452	.508	23	371	321	48-36	.572
22	New York Mets	.491	41	41	.500	.488	16	282	301	38-44	.467
23	San Francisco Giants	.491	42	40	.512	.484	8	345	332	43-39	.519
24	Boston Red Sox	.488	38	45	.458	.498	27	349	393	37-46	.441
25	Cincinnati Reds	.488	36	43	.456	.498	18	317	347	36-43	.455
26	Milwaukee Brewers	.487	35	48	.422	.508	29	330	386	35-48	.422
27	Atlanta Braves	.484	40	41	.494	.481	22	322	345	38-43	.466
28	Miami Marlins	.478	35	47	.427	.495	28	300	337	36-46	.442
29	Colorado Rockies	.469	34	47	.420	.485	25	355	415	34-47	.423
30	Philadelphia Phillies	.450	27	56	.325	.491	30	281	418	26-57	.311

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.