2015 MLB Relative Power Index (RPI),as of the games of April 19,2015

MLB RPI Rankings
RK	TEAM	RPI	W	L	PCT	SOS	PWR	RS	RA	EXPW-L	EXPWP
1	Los Angeles Dodgers	.622	9	3	.750	.580	0	63	46	8-4	.652
2	Detroit Tigers	.585	10	2	.833	.502	0	68	35	9-3	.791
3	Chicago Cubs	.571	6	5	.545	.579	0	45	43	6-5	.523
4	San Diego Padres	.566	8	5	.615	.549	0	59	47	8-5	.612
5	St. Louis Cardinals	.564	8	3	.727	.509	0	43	24	8-3	.762
6	Kansas City Royals	.558	9	3	.750	.494	0	68	40	9-3	.743
7	New York Mets	.546	10	3	.769	.471	0	57	41	9-4	.659
8	Baltimore Orioles	.534	7	5	.583	.518	0	61	53	7-5	.570
9	Chicago White Sox	.522	4	7	.364	.575	0	38	52	4-7	.348
10	Cincinnati Reds	.522	5	7	.417	.558	0	37	50	4-8	.354
11	Minnesota Twins	.521	5	7	.417	.556	0	39	59	4-8	.304
12	Atlanta Braves	.516	8	4	.667	.465	0	54	44	7-5	.601
13	New York Yankees	.512	6	6	.500	.516	0	64	56	7-5	.566
14	Boston Red Sox	.505	7	5	.583	.479	0	63	64	6-6	.492
15	Toronto Blue Jays	.502	6	7	.462	.516	0	70	61	7-6	.568
16	Colorado Rockies	.498	7	5	.583	.469	0	51	45	7-5	.562
17	Arizona Diamondbacks	.481	7	6	.538	.462	22	60	49	8-5	.600
18	Cleveland Indians	.474	4	7	.364	.511	0	35	46	4-7	.367
19	Miami Marlins	.469	3	10	.231	.548	0	50	65	5-8	.372
20	Seattle Mariners	.467	5	7	.417	.484	18	47	62	4-8	.365
21	Oakland Athletics	.465	6	7	.462	.467	0	67	43	9-4	.708
22	Tampa Bay Rays	.464	6	7	.462	.465	0	51	63	5-8	.396
23	Los Angeles Angels	.456	5	7	.417	.469	0	43	50	5-7	.425
24	San Francisco Giants	.439	4	10	.286	.490	0	37	62	4-10	.263
25	Washington Nationals	.434	6	7	.462	.425	0	53	52	7-6	.510
26	Houston Astros	.430	6	6	.500	.406	0	34	40	5-7	.419
27	Pittsburgh Pirates	.421	6	6	.500	.395	0	46	37	7-5	.607
28	Philadelphia Phillies	.420	4	9	.308	.458	0	32	56	3-10	.246
29	Texas Rangers	.407	5	8	.385	.415	0	51	66	5-8	.374
30	Milwaukee Brewers	.336	2	10	.167	.393	0	30	65	2-10	.176

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.