2017 MLB Relative Power Index (RPI),as of the games of August 6,2017 from ESPN.GO.COM

MLB RPI Rankings
RK	TEAM	RPI	W	L	PCT	SOS	PWR	RS	RA	EXPW-L	EXPWP
1	Los Angeles Dodgers	.551	79	32	.712	.497	0	569	365	79-32	.708
2	Houston Astros	.535	71	40	.640	.500	0	656	486	72-39	.646
3	Colorado Rockies	.521	64	48	.571	.504	0	593	543	61-51	.544
4	Arizona Diamondbacks	.517	63	48	.568	.500	0	554	440	68-43	.613
5	Washington Nationals	.515	65	44	.596	.488	0	598	486	66-43	.602
6	Boston Red Sox	.511	63	49	.563	.494	0	533	456	65-47	.577
7	New York Yankees	.510	59	51	.536	.502	0	573	458	67-43	.610
8	Chicago Cubs	.507	58	52	.527	.501	0	521	482	59-51	.539
9	Tampa Bay Rays	.506	58	55	.513	.503	0	507	503	57-56	.504
10	Cleveland Indians	.506	59	50	.541	.494	0	530	434	65-44	.599
11	Baltimore Orioles	.504	55	56	.495	.507	0	522	575	50-61	.452
12	Kansas City Royals	.503	57	53	.518	.498	0	481	487	54-56	.494
13	Seattle Mariners	.502	57	56	.504	.501	0	533	539	56-57	.494
14	Los Angeles Angels	.501	55	57	.491	.504	0	479	493	54-58	.486
15	Milwaukee Brewers	.500	59	54	.522	.493	0	522	494	60-53	.528
16	St. Louis Cardinals	.500	55	56	.495	.502	0	496	462	59-52	.535
17	Minnesota Twins	.498	53	56	.486	.502	0	490	563	47-62	.431
18	Texas Rangers	.495	53	58	.477	.501	0	545	544	56-55	.501
19	Toronto Blue Jays	.494	52	59	.468	.502	0	474	561	46-65	.417
20	Pittsburgh Pirates	.493	54	57	.486	.495	0	472	499	52-59	.472
21	Miami Marlins	.491	52	57	.477	.496	0	514	530	53-56	.485
22	Detroit Tigers	.490	51	59	.464	.499	0	529	561	52-58	.471
23	San Diego Padres	.489	49	61	.445	.503	0	420	555	40-70	.364
24	Oakland Athletics	.488	50	62	.446	.501	0	489	579	47-65	.416
25	Atlanta Braves	.487	51	59	.464	.495	0	504	560	49-61	.448
26	New York Mets	.485	49	60	.450	.497	0	512	576	48-61	.441
27	Cincinnati Reds	.481	45	66	.405	.506	0	500	604	45-66	.407
28	San Francisco Giants	.479	44	69	.389	.509	0	453	559	45-68	.396
29	Chicago White Sox	.470	41	68	.376	.501	0	465	551	45-64	.416
30	Philadelphia Phillies	.470	40	69	.367	.504	0	437	526	45-64	.408

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.