2017 MLB Relative Power Index (RPI),as of the games of August 5,2017 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	78	32	.709	.498	0	561	365	77-33	.703
2	Houston Astros	.534	70	40	.636	.500	0	649	480	71-39	.646
3	Colorado Rockies	.523	64	47	.577	.505	0	591	540	60-51	.545
4	Arizona Diamondbacks	.519	63	47	.573	.501	0	551	434	68-42	.617
5	Washington Nationals	.514	64	44	.593	.488	0	589	482	65-43	.599
6	Boston Red Sox	.510	62	49	.559	.494	0	527	453	64-47	.575
7	New York Yankees	.509	58	51	.532	.501	0	565	457	66-43	.605
8	Chicago Cubs	.508	58	51	.532	.500	0	517	473	59-50	.544
9	Cleveland Indians	.507	59	49	.546	.494	0	529	426	66-42	.607
10	Tampa Bay Rays	.504	57	55	.509	.503	0	505	502	56-56	.503
11	Kansas City Royals	.503	56	52	.519	.498	0	465	478	53-55	.486
12	Baltimore Orioles	.503	54	56	.491	.507	0	510	572	49-61	.443
13	Los Angeles Angels	.502	55	56	.495	.504	0	469	482	54-57	.486
14	Seattle Mariners	.501	56	55	.505	.500	0	524	523	56-55	.501
15	Milwaukee Brewers	.501	59	53	.527	.493	0	521	492	59-53	.529
16	St. Louis Cardinals	.500	54	56	.491	.503	0	483	458	58-52	.527
17	Minnesota Twins	.497	52	56	.481	.503	0	484	558	46-62	.429
18	Texas Rangers	.496	53	57	.482	.501	0	540	538	55-55	.502
19	Toronto Blue Jays	.494	52	58	.473	.501	0	468	554	46-64	.416
20	Pittsburgh Pirates	.492	53	57	.482	.495	0	467	495	52-58	.471
21	Detroit Tigers	.492	51	58	.468	.500	0	526	549	52-57	.479
22	San Diego Padres	.491	49	60	.450	.504	0	416	550	40-69	.364
23	Miami Marlins	.490	51	57	.472	.496	0	510	529	52-56	.482
24	Atlanta Braves	.488	51	58	.468	.495	0	503	556	49-60	.450
25	Oakland Athletics	.486	49	62	.441	.501	0	478	569	46-65	.414
26	New York Mets	.485	49	59	.454	.496	0	512	568	48-60	.448
27	Cincinnati Reds	.482	45	65	.409	.506	0	496	591	45-65	.413
28	San Francisco Giants	.478	43	69	.384	.510	0	447	556	44-68	.393
29	Chicago White Sox	.471	41	67	.380	.502	0	462	545	45-63	.418
30	Philadelphia Phillies	.468	39	69	.361	.504	0	434	524	44-64	.407

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.