2017 MLB Relative Power Index (RPI),as of the games of September 11,2017 from ESPN.GO.COM

MLB RPI Rankings
RK	TEAM	RPI	W	L	PCT	SOS	PWR	RS	RA	EXPW-L	EXPWP
1	Los Angeles Dodgers	.533	92	52	.639	.497	0	687	521	91-53	.635
2	Cleveland Indians	.526	88	56	.611	.498	0	733	515	96-48	.670
3	Houston Astros	.526	86	57	.601	.500	0	788	644	86-57	.600
4	Arizona Diamondbacks	.524	83	61	.576	.506	0	714	578	87-57	.604
5	Washington Nationals	.519	88	55	.615	.487	0	748	591	88-55	.616
6	Boston Red Sox	.517	81	62	.566	.501	0	681	588	82-61	.573
7	New York Yankees	.515	78	65	.545	.505	0	755	599	88-55	.614
8	Colorado Rockies	.515	79	65	.549	.504	0	738	688	77-67	.535
9	Minnesota Twins	.505	74	69	.517	.501	0	705	715	70-73	.493
10	Chicago Cubs	.505	77	66	.538	.494	0	707	636	79-64	.553
11	Baltimore Orioles	.505	71	73	.493	.508	0	687	729	68-76	.470
12	Los Angeles Angels	.504	73	70	.510	.502	0	635	631	72-71	.503
13	St. Louis Cardinals	.504	75	68	.524	.497	0	678	604	80-63	.558
14	Milwaukee Brewers	.504	75	69	.521	.498	0	648	631	74-70	.513
15	Texas Rangers	.502	72	71	.503	.502	0	741	702	75-68	.527
16	Tampa Bay Rays	.500	71	74	.490	.503	0	621	637	71-74	.487
17	Kansas City Royals	.500	71	72	.497	.501	0	629	701	64-79	.446
18	Seattle Mariners	.498	71	73	.493	.500	0	664	687	70-74	.483
19	Toronto Blue Jays	.494	67	77	.465	.504	0	616	705	62-82	.433
20	San Diego Padres	.491	65	79	.451	.504	0	556	700	56-88	.387
21	Pittsburgh Pirates	.489	68	77	.469	.496	0	600	664	65-80	.449
22	Oakland Athletics	.489	63	80	.441	.505	0	657	749	62-81	.435
23	Miami Marlins	.486	68	75	.476	.490	0	663	701	68-75	.472
24	Detroit Tigers	.484	60	83	.420	.506	0	665	776	61-82	.423
25	Cincinnati Reds	.484	62	82	.431	.502	0	686	780	63-81	.436
26	New York Mets	.482	63	80	.441	.495	0	663	741	64-79	.445
27	Atlanta Braves	.481	64	78	.451	.492	0	657	737	63-79	.443
28	Chicago White Sox	.479	57	86	.399	.505	0	623	731	60-83	.421
29	San Francisco Giants	.474	57	89	.390	.502	0	582	725	57-89	.392
30	Philadelphia Phillies	.467	54	89	.378	.497	0	595	716	58-85	.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.