2016 MLB Relative Power Index (RPI),as of the games of September 17,2016 from ESPN.GO.COM

MLB RPI Rankings

RK	TEAM	RPI	W	L	PCT	SOS	PWR	RS	RA	EXPW-L	EXPWP
1	Chicago Cubs	.529	94	54	.635	.494	0	734	508	100-48	.676
2	Texas Rangers	.528	88	61	.591	.507	0	717	706	76-73	.508
3	Boston Red Sox	.520	84	64	.568	.504	0	825	650	91-57	.617
4	Washington Nationals	.520	88	60	.595	.495	0	700	547	92-56	.621
5	Baltimore Orioles	.519	81	67	.547	.509	0	699	673	77-71	.519
6	Cleveland Indians	.519	86	62	.581	.498	0	724	617	86-62	.579
7	Toronto Blue Jays	.515	81	67	.547	.505	0	708	629	83-65	.559
8	Houston Astros	.512	78	70	.527	.506	0	675	628	79-69	.536
9	Seattle Mariners	.511	78	70	.527	.505	0	701	653	79-69	.535
10	New York Yankees	.511	77	71	.520	.507	0	624	642	72-76	.486
11	Los Angeles Dodgers	.509	84	64	.568	.489	0	656	576	84-64	.565
12	Detroit Tigers	.508	78	70	.527	.501	0	668	671	74-74	.498
13	Kansas City Royals	.505	75	73	.507	.504	0	607	646	69-79	.469
14	New York Mets	.505	79	69	.534	.495	0	582	557	77-71	.522
15	St. Louis Cardinals	.503	77	71	.520	.497	0	709	649	81-67	.544
16	San Francisco Giants	.502	79	69	.534	.491	0	655	588	82-66	.554
17	Chicago White Sox	.500	72	76	.486	.505	0	622	644	71-77	.483
18	Pittsburgh Pirates	.496	74	74	.500	.494	0	678	679	74-74	.499
19	Miami Marlins	.491	73	75	.493	.490	0	606	618	73-75	.490
20	Tampa Bay Rays	.491	64	84	.432	.510	0	631	652	72-76	.484
21	Los Angeles Angels	.490	64	84	.432	.510	0	646	688	69-79	.469
22	Oakland Athletics	.490	65	83	.439	.507	0	610	702	64-84	.430
23	Colorado Rockies	.489	71	77	.480	.492	0	792	781	75-73	.507
24	Philadelphia Phillies	.483	67	82	.450	.494	0	549	702	57-92	.380
25	Milwaukee Brewers	.483	67	82	.450	.494	0	625	679	68-81	.459
26	Cincinnati Reds	.480	62	86	.419	.500	0	651	785	60-88	.407
27	San Diego Padres	.478	62	86	.419	.498	0	628	709	65-83	.440
28	Arizona Diamondbacks	.476	62	86	.419	.495	0	692	837	60-88	.406
29	Minnesota Twins	.470	55	94	.369	.504	0	681	824	60-89	.406
30	Atlanta Braves	.469	57	91	.385	.497	0	582	737	57-91	.384

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.