2017 MLB Relative Power Index (RPI),as of the games of June 15,2017 from ESPN.GO.COM

MLB RPI Rankings

RK	TEAM	RPI	W	L	PCT	SOS	PWR	RS	RA	EXPW-L	EXPWP
1	Houston Astros	.548	45	22	.672	.507	0	366	264	44-23	.658
2	Colorado Rockies	.533	43	26	.623	.502	0	361	294	41-28	.601
3	New York Yankees	.530	38	26	.594	.509	0	372	259	43-21	.674
4	Arizona Diamondbacks	.527	41	26	.612	.499	0	344	261	43-24	.635
5	Los Angeles Dodgers	.525	41	26	.612	.496	0	327	240	44-23	.650
6	Baltimore Orioles	.519	32	33	.492	.527	0	288	335	28-37	.425
7	Minnesota Twins	.512	34	29	.540	.503	0	304	328	29-34	.462
8	Cleveland Indians	.511	32	31	.508	.512	0	287	269	34-29	.532
9	Boston Red Sox	.511	37	29	.561	.494	0	313	280	37-29	.555
10	Tampa Bay Rays	.510	35	34	.507	.512	0	327	310	36-33	.527
11	Los Angeles Angels	.505	35	35	.500	.507	0	296	302	34-36	.490
12	Washington Nationals	.505	40	26	.606	.471	0	363	298	39-27	.597
13	Seattle Mariners	.504	33	35	.485	.510	0	323	327	34-34	.494
14	Milwaukee Brewers	.503	36	32	.529	.495	0	334	317	36-32	.526
15	Texas Rangers	.503	32	33	.492	.507	0	308	303	33-32	.508
16	Detroit Tigers	.502	31	34	.477	.511	0	314	323	32-33	.486
17	Toronto Blue Jays	.500	32	33	.492	.503	0	278	289	31-34	.481
18	Kansas City Royals	.500	31	34	.477	.508	0	259	289	29-36	.445
19	Chicago Cubs	.495	32	33	.492	.496	0	304	301	33-32	.505
20	Chicago White Sox	.491	29	36	.446	.505	0	295	297	32-33	.497
21	Oakland Athletics	.489	28	38	.424	.511	0	282	358	25-41	.383
22	Pittsburgh Pirates	.487	30	36	.455	.497	0	279	312	29-37	.444
23	St. Louis Cardinals	.486	30	35	.462	.494	0	269	283	31-34	.475
24	San Diego Padres	.486	27	40	.403	.513	0	243	356	21-46	.318
25	Miami Marlins	.479	29	35	.453	.488	0	302	308	31-33	.490
26	San Francisco Giants	.477	26	42	.382	.508	0	251	325	25-43	.374
27	Cincinnati Reds	.472	29	36	.446	.480	0	324	341	31-34	.474
28	New York Mets	.470	30	35	.462	.473	0	320	344	30-35	.464
29	Atlanta Braves	.464	29	36	.446	.470	0	302	338	29-36	.444
30	Philadelphia Phillies	.455	22	43	.338	.493	0	254	338	23-42	.361

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.