2015 MLB Relative Power Index (RPI),as of the games of August 24,2015

MLB RPI Rankings
RK	TEAM	RPI	W	L	PCT	SOS	PWR	RS	RA	EXPW-L	EXPWP
1	St. Louis Cardinals	.538	79	45	.637	.505	1	490	372	79-45	.634
2	Kansas City Royals	.534	76	48	.613	.508	2	545	463	72-52	.581
3	Pittsburgh Pirates	.530	75	48	.610	.503	3	526	446	72-51	.582
4	Chicago Cubs	.524	72	51	.585	.503	4	511	471	67-56	.541
5	New York Yankees	.515	69	55	.556	.501	5	586	518	70-54	.561
6	Toronto Blue Jays	.515	69	55	.556	.501	6	670	506	79-45	.637
7	Houston Astros	.511	69	57	.548	.498	7	532	452	73-53	.581
8	Minnesota Twins	.508	63	61	.508	.508	16	533	547	60-64	.487
9	New York Mets	.507	68	56	.548	.493	9	496	450	68-56	.549
10	Los Angeles Dodgers	.505	67	56	.545	.491	8	505	454	68-55	.553
11	Texas Rangers	.505	64	59	.520	.499	11	548	571	59-64	.479
12	Detroit Tigers	.504	59	65	.476	.513	18	549	601	56-68	.455
13	Los Angeles Angels	.503	63	61	.508	.502	12	499	501	62-62	.498
14	Chicago White Sox	.502	58	65	.472	.513	20	472	528	55-68	.444
15	San Francisco Giants	.501	66	58	.532	.491	10	532	470	70-54	.562
16	Tampa Bay Rays	.500	62	62	.500	.500	14	460	474	60-64	.485
17	Baltimore Orioles	.499	62	62	.500	.499	13	547	498	68-56	.547
18	Cleveland Indians	.498	58	66	.468	.508	22	493	518	59-65	.475
19	San Diego Padres	.497	61	63	.492	.498	19	505	544	57-67	.463
20	Washington Nationals	.494	62	61	.504	.491	15	518	497	64-59	.521
21	Arizona Diamondbacks	.493	62	62	.500	.491	17	567	529	66-58	.535
22	Seattle Mariners	.490	57	68	.456	.502	23	479	577	51-74	.408
23	Boston Red Sox	.490	57	68	.456	.501	21	569	612	58-67	.464
24	Oakland Athletics	.488	55	71	.437	.505	25	517	500	65-61	.517
25	Milwaukee Brewers	.488	53	72	.424	.510	24	495	561	55-70	.438
26	Cincinnati Reds	.486	52	71	.423	.507	27	487	543	55-68	.446
27	Atlanta Braves	.474	54	71	.432	.488	26	460	562	50-75	.401
28	Colorado Rockies	.470	49	74	.398	.494	28	551	665	50-73	.407
29	Philadelphia Phillies	.467	50	75	.400	.489	29	472	626	45-80	.362
30	Miami Marlins	.467	50	75	.400	.489	30	464	522	55-70	.441

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.