2017 MLB Relative Power Index (RPI),as of the games of August 18,2017 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	86	34	.717	.497	0	617	400	84-36	.704
2	Houston Astros	.528	75	47	.615	.499	0	694	535	77-45	.627
3	Arizona Diamondbacks	.517	67	55	.549	.506	0	597	499	72-50	.589
4	Colorado Rockies	.517	68	54	.557	.504	0	641	584	67-55	.546
5	Washington Nationals	.517	73	47	.608	.486	0	642	511	73-47	.612
6	Boston Red Sox	.517	70	51	.579	.496	0	587	491	71-50	.588
7	Cleveland Indians	.512	67	53	.558	.497	0	585	457	75-45	.621
8	New York Yankees	.510	65	56	.537	.501	0	625	511	73-48	.599
9	Chicago Cubs	.507	64	57	.529	.499	0	587	535	66-55	.546
10	Los Angeles Angels	.506	62	60	.508	.505	0	522	529	60-62	.493
11	St. Louis Cardinals	.506	63	59	.516	.502	0	580	527	67-55	.548
12	Minnesota Twins	.504	61	59	.508	.502	0	561	615	55-65	.454
13	Baltimore Orioles	.503	60	62	.492	.507	0	584	626	57-65	.465
14	Seattle Mariners	.501	62	61	.504	.499	0	579	589	60-63	.491
15	Texas Rangers	.500	60	61	.496	.501	0	609	583	63-58	.522
16	Tampa Bay Rays	.499	60	64	.484	.505	0	529	547	60-64	.483
17	Kansas City Royals	.499	61	60	.504	.497	0	542	568	58-63	.477
18	Milwaukee Brewers	.498	63	60	.512	.493	0	569	556	63-60	.512
19	Toronto Blue Jays	.498	59	63	.484	.502	0	521	600	52-70	.430
20	Miami Marlins	.495	59	61	.492	.497	0	564	572	59-61	.493
21	Pittsburgh Pirates	.489	58	64	.475	.493	0	519	565	56-66	.458
22	San Diego Padres	.487	54	68	.443	.502	0	467	619	44-78	.363
23	Oakland Athletics	.486	53	69	.434	.503	0	538	642	50-72	.413
24	Detroit Tigers	.485	53	68	.438	.501	0	584	639	55-66	.455
25	Cincinnati Reds	.484	52	71	.423	.504	0	583	679	52-71	.424
26	Atlanta Braves	.483	54	66	.450	.494	0	543	617	52-68	.436
27	New York Mets	.482	53	67	.442	.496	0	557	620	54-66	.447
28	San Francisco Giants	.480	50	74	.403	.506	0	500	605	50-74	.406
29	Chicago White Sox	.476	46	73	.387	.506	0	516	604	50-69	.422
30	Philadelphia Phillies	.464	43	77	.358	.499	0	470	587	47-73	.391

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.