2015 MLB Relative Power Index (RPI),as of the games of June 16,2015

MLB RPI Rankings
RK	TEAM	RPI	W	L	PCT	SOS	PWR	RS	RA	EXPW-L	EXPWP
1	St. Louis Cardinals	.548	43	21	.672	.507	1	253	183	42-22	.657
2	Kansas City Royals	.535	36	25	.590	.517	3	266	213	37-24	.609
3	Chicago Cubs	.521	34	28	.548	.512	9	250	250	31-31	.500
4	Los Angeles Dodgers	.519	37	28	.569	.502	2	281	225	40-25	.609
5	Detroit Tigers	.516	34	31	.523	.514	15	272	265	33-32	.513
6	New York Yankees	.516	34	30	.531	.511	8	290	278	33-31	.521
7	Houston Astros	.515	38	28	.576	.495	7	287	254	37-29	.561
8	Pittsburgh Pirates	.511	37	27	.578	.489	4	264	205	40-24	.624
9	Minnesota Twins	.508	34	30	.531	.500	11	267	267	32-32	.500
10	Tampa Bay Rays	.508	36	30	.545	.495	10	246	239	34-32	.514
11	Texas Rangers	.507	35	30	.538	.497	12	296	281	34-31	.526
12	Toronto Blue Jays	.506	34	32	.515	.503	5	361	292	40-26	.604
13	Los Angeles Angels	.505	33	32	.508	.503	17	255	258	32-33	.494
14	Cleveland Indians	.504	30	33	.476	.513	19	265	269	31-32	.493
15	Baltimore Orioles	.504	33	31	.516	.500	16	288	253	36-28	.564
16	New York Mets	.503	36	30	.545	.489	13	254	252	33-33	.504
17	San Diego Padres	.501	32	35	.478	.508	18	284	299	32-35	.474
18	Arizona Diamondbacks	.499	31	33	.484	.504	22	291	285	33-31	.510
19	San Francisco Giants	.496	35	31	.530	.485	6	265	259	34-32	.511
20	Chicago White Sox	.493	28	35	.444	.509	23	221	288	23-40	.371
21	Washington Nationals	.492	34	31	.523	.481	14	289	280	34-31	.516
22	Seattle Mariners	.491	29	36	.446	.506	21	223	268	27-38	.409
23	Cincinnati Reds	.484	29	35	.453	.495	24	257	277	30-34	.463
24	Oakland Athletics	.484	28	39	.418	.506	26	288	264	36-31	.543
25	Milwaukee Brewers	.482	24	42	.364	.521	29	241	313	25-41	.372
26	Atlanta Braves	.479	31	34	.477	.480	20	278	295	31-34	.470
27	Miami Marlins	.478	29	37	.439	.490	25	259	270	32-34	.479
28	Colorado Rockies	.477	28	36	.438	.490	27	277	318	28-36	.431
29	Boston Red Sox	.475	28	38	.424	.492	28	258	315	26-40	.401
30	Philadelphia Phillies	.449	22	44	.333	.487	30	200	311	19-47	.293

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.