2015 MLB Relative Power Index (RPI),as of August 7,2015

MLB RPI Rankings
RK	TEAM	RPI	W	L	PCT	SOS	PWR	RS	RA	EXPW-L	EXPWP
1	St. Louis Cardinals	.540	70	39	.642	.505	1	433	314	71-38	.655
2	Kansas City Royals	.529	64	44	.593	.507	2	464	403	62-46	.570
3	Pittsburgh Pirates	.520	63	44	.589	.497	3	441	391	60-47	.560
4	Chicago Cubs	.520	60	48	.556	.508	10	422	407	56-52	.518
5	New York Yankees	.516	61	47	.565	.499	7	529	460	61-47	.569
6	Los Angeles Dodgers	.512	62	47	.569	.493	4	456	391	63-46	.576
7	Houston Astros	.512	61	50	.550	.499	5	494	414	65-46	.587
8	Los Angeles Angels	.509	58	50	.537	.500	8	455	407	60-48	.556
9	New York Mets	.507	59	50	.541	.496	12	402	386	57-52	.520
10	Toronto Blue Jays	.507	59	52	.532	.499	11	589	468	68-43	.613
11	Minnesota Twins	.505	55	54	.505	.505	14	460	475	53-56	.484
12	Detroit Tigers	.504	53	56	.486	.509	17	483	522	50-59	.461
13	Texas Rangers	.502	54	54	.500	.502	15	480	518	50-58	.462
14	Baltimore Orioles	.500	55	53	.509	.497	13	475	426	60-48	.554
15	San Francisco Giants	.500	59	50	.541	.486	6	479	423	61-48	.562
16	Chicago White Sox	.500	51	56	.477	.507	20	398	469	45-62	.419
17	Washington Nationals	.499	56	52	.519	.492	9	449	425	57-51	.527
18	Tampa Bay Rays	.497	54	56	.491	.499	16	407	418	54-56	.487
19	San Diego Padres	.496	52	58	.473	.504	18	431	488	48-62	.438
20	Arizona Diamondbacks	.496	53	55	.491	.497	19	477	469	55-53	.508
21	Seattle Mariners	.493	51	59	.464	.503	22	412	464	48-62	.441
22	Cleveland Indians	.492	49	59	.454	.504	21	417	458	49-59	.453
23	Cincinnati Reds	.490	48	59	.449	.504	24	419	466	48-59	.447
24	Milwaukee Brewers	.490	47	64	.423	.512	28	438	492	49-62	.442
25	Oakland Athletics	.489	49	62	.441	.505	26	456	423	60-51	.537
26	Boston Red Sox	.486	49	61	.445	.500	25	459	529	47-63	.430
27	Atlanta Braves	.479	50	60	.455	.487	23	413	484	46-64	.421
28	Colorado Rockies	.479	46	61	.430	.495	27	492	557	47-60	.438
29	Philadelphia Phillies	.469	43	67	.391	.495	30	409	536	40-70	.368
30	Miami Marlins	.468	43	67	.391	.493	29	394	450	48-62	.434

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.