2015 MLB Relative Power Index (RPI), as of the games of April 14,2015

MLB RPI Rankings
RK	TEAM	RPI	W	L	PCT	SOS	PWR	RS	RA	EXPW-L	EXPWP
1	Kansas City Royals	.691	7	0	1.000	.588	2	52	18	6-1	.893
2	Chicago Cubs	.656	4	3	.571	.684	22	27	27	4-4	.500
3	Atlanta Braves	.589	6	2	.750	.535	14	34	23	5-3	.686
4	St. Louis Cardinals	.583	3	3	.500	.610	4	22	18	4-2	.599
5	Colorado Rockies	.573	6	2	.750	.514	11	41	23	6-2	.761
6	Cincinnati Reds	.559	5	3	.625	.537	7	33	32	4-4	.515
7	Detroit Tigers	.540	7	1	.875	.429	1	53	21	7-1	.864
8	Los Angeles Dodgers	.540	5	3	.625	.512	8	38	38	4-4	.500
9	Los Angeles Angels	.534	3	5	.375	.587	10	24	37	2-6	.296
10	New York Mets	.529	5	3	.625	.497	18	28	24	5-3	.576
11	San Diego Padres	.514	5	4	.556	.500	16	40	32	5-4	.610
12	Baltimore Orioles	.511	4	4	.500	.515	6	40	41	4-4	.488
13	Boston Red Sox	.509	6	2	.750	.429	3	51	40	5-3	.619
14	Arizona Diamondbacks	.507	4	4	.500	.509	21	36	35	4-4	.514
15	Toronto Blue Jays	.503	4	4	.500	.505	5	41	32	5-3	.621
16	Miami Marlins	.499	2	6	.250	.583	23	28	40	3-5	.329
17	New York Yankees	.497	3	5	.375	.538	26	40	42	4-4	.476
18	Tampa Bay Rays	.493	5	3	.625	.450	28	33	30	4-4	.548
19	Chicago White Sox	.493	3	4	.429	.515	24	22	34	2-5	.295
20	San Francisco Giants	.470	3	6	.333	.515	15	24	36	3-6	.308
21	Philadelphia Phillies	.455	3	5	.375	.481	20	21	31	3-5	.315
22	Pittsburgh Pirates	.450	3	5	.375	.476	19	29	29	4-4	.500
23	Seattle Mariners	.444	3	5	.375	.467	12	30	43	3-5	.327
24	Minnesota Twins	.444	1	6	.143	.544	30	16	45	1-6	.112
25	Cleveland Indians	.440	2	5	.286	.491	17	23	32	2-5	.341
26	Oakland Athletics	.416	5	4	.556	.369	13	55	27	7-2	.806
27	Texas Rangers	.414	4	5	.444	.404	27	35	41	4-5	.422
28	Washington Nationals	.414	2	6	.250	.468	9	24	37	2-6	.296
29	Milwaukee Brewers	.413	2	5	.286	.455	29	21	40	2-5	.216
30	Houston Astros	.354	3	5	.375	.347	25	17	30	2-6	.243

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.