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

MLB RPI Rankings
RK	TEAM	RPI	W	L	PCT	SOS	PWR	RS	RA	EXPW-L	EXPWP
1	Los Angeles Dodgers	.552	84	34	.712	.498	0	604	391	83-35	.705
2	Houston Astros	.527	73	46	.613	.498	0	682	525	75-44	.628
3	Arizona Diamondbacks	.518	66	53	.555	.505	0	585	480	71-48	.598
4	Washington Nationals	.517	71	46	.607	.487	0	631	506	71-46	.609
5	Colorado Rockies	.517	66	53	.555	.504	0	612	568	64-55	.537
6	Boston Red Sox	.515	68	51	.571	.496	0	573	481	70-49	.587
7	Cleveland Indians	.511	65	52	.556	.496	0	564	449	72-45	.612
8	New York Yankees	.509	63	55	.534	.501	0	607	494	71-47	.602
9	Chicago Cubs	.507	62	56	.525	.500	0	563	512	65-53	.547
10	Los Angeles Angels	.505	61	59	.508	.504	0	512	518	59-61	.494
11	St. Louis Cardinals	.504	61	58	.513	.502	0	554	505	65-54	.546
12	Baltimore Orioles	.502	59	61	.492	.506	0	569	612	56-64	.464
13	Tampa Bay Rays	.502	60	61	.496	.504	0	523	532	59-62	.491
14	Minnesota Twins	.502	59	58	.504	.501	0	544	601	53-64	.450
15	Texas Rangers	.499	58	60	.492	.502	0	585	565	61-57	.517
16	Kansas City Royals	.499	60	59	.504	.497	0	534	552	58-61	.483
17	Seattle Mariners	.498	60	61	.496	.499	0	565	582	59-62	.485
18	Milwaukee Brewers	.498	62	59	.512	.494	0	558	542	62-59	.515
19	Toronto Blue Jays	.496	57	62	.479	.502	0	509	588	51-68	.428
20	Miami Marlins	.495	57	61	.483	.498	0	553	570	57-61	.485
21	Pittsburgh Pirates	.492	58	61	.487	.493	0	496	536	55-64	.461
22	San Diego Padres	.488	53	66	.445	.502	0	462	610	43-76	.365
23	Oakland Athletics	.487	53	67	.442	.502	0	531	632	50-70	.414
24	Detroit Tigers	.486	53	66	.445	.499	0	573	619	55-64	.461
25	New York Mets	.485	53	64	.453	.496	0	548	605	53-64	.451
26	Atlanta Braves	.484	53	64	.453	.495	0	528	591	52-65	.444
27	Cincinnati Reds	.483	50	70	.417	.505	0	559	659	50-70	.418
28	San Francisco Giants	.480	48	73	.397	.508	0	484	591	49-72	.401
29	Chicago White Sox	.475	45	71	.388	.504	0	500	587	49-67	.420
30	Philadelphia Phillies	.468	43	74	.368	.501	0	464	569	47-70	.399

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.