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

MLB RPI Rankings
RK	TEAM	RPI	W	L	PCT	SOS	PWR	RS	RA	EXPW-L	EXPWP
1	New York Mets	.573	13	4	.765	.509	6	74	53	11-6	.661
2	New York Yankees	.569	10	7	.588	.563	20	91	66	11-6	.655
3	Chicago Cubs	.553	9	7	.563	.550	14	73	65	9-7	.558
4	Los Angeles Dodgers	.547	10	6	.625	.521	3	72	58	10-6	.606
5	Kansas City Royals	.545	12	4	.750	.477	2	84	51	12-4	.731
6	San Diego Padres	.544	10	8	.556	.541	7	85	66	11-7	.624
7	St. Louis Cardinals	.539	11	4	.733	.475	5	58	32	11-4	.767
8	Detroit Tigers	.536	11	6	.647	.498	1	78	69	10-7	.561
9	Atlanta Braves	.533	8	8	.500	.544	16	60	61	8-8	.492
10	Toronto Blue Jays	.523	9	8	.529	.520	10	97	87	9-8	.554
11	Tampa Bay Rays	.522	9	8	.529	.520	21	72	73	8-9	.493
12	Colorado Rockies	.520	10	7	.588	.498	8	73	75	8-9	.486
13	Minnesota Twins	.516	6	10	.375	.563	28	48	74	5-11	.296
14	Boston Red Sox	.507	10	7	.588	.480	4	84	79	9-8	.531
15	Cincinnati Reds	.490	8	9	.471	.496	17	66	73	8-9	.450
16	Baltimore Orioles	.488	7	10	.412	.514	9	81	91	8-9	.442
17	Arizona Diamondbacks	.485	8	8	.500	.480	22	70	65	9-7	.537
18	Los Angeles Angels	.480	8	9	.471	.484	12	67	68	8-9	.493
19	Chicago White Sox	.480	6	9	.400	.507	23	52	64	6-9	.398
20	San Francisco Giants	.479	7	11	.389	.510	26	53	74	6-12	.339
21	Washington Nationals	.474	7	10	.412	.495	13	63	67	8-9	.469
22	Oakland Athletics	.474	8	10	.444	.484	11	87	69	11-7	.614
23	Houston Astros	.470	9	7	.563	.439	25	54	55	8-8	.491
24	Seattle Mariners	.464	7	9	.438	.473	18	60	77	6-10	.378
25	Pittsburgh Pirates	.464	9	8	.529	.443	15	69	59	10-7	.578
26	Miami Marlins	.458	6	11	.353	.494	27	71	76	8-9	.466
27	Cleveland Indians	.452	6	9	.400	.469	19	57	59	7-8	.483
28	Texas Rangers	.432	6	10	.375	.451	24	65	78	7-9	.410
29	Philadelphia Phillies	.430	6	11	.353	.455	30	42	74	4-13	.244
30	Milwaukee Brewers	.397	3	14	.176	.470	29	46	94	3-14	.193

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.