MLB Relative Power Index (RPI) - 2015

MLB RPI Rankings
RK	TEAM	RPI	W	L	PCT	SOS	PWR	RS	RA	EXPW-L	EXPWP
1	Boston Red Sox	.733	4	1	.800	.711	12	30	15	4-1	.800
2	Detroit Tigers	.693	5	0	1.000	.591	6	39	11	5-0	.926
3	Kansas City Royals	.693	5	0	1.000	.591	15	31	13	4-1	.850
4	Atlanta Braves	.683	5	0	1.000	.578	27	26	9	4-1	.893
5	Chicago Cubs	.656	2	2	.500	.708	20	12	13	2-2	.460
6	St. Louis Cardinals	.656	2	2	.500	.708	3	11	8	3-1	.654
7	Philadelphia Phillies	.640	3	2	.600	.653	30	13	19	2-3	.319
8	Cincinnati Reds	.570	4	1	.800	.493	22	19	16	3-2	.585
9	Colorado Rockies	.570	4	1	.800	.493	28	30	16	4-1	.779
10	San Francisco Giants	.558	3	3	.500	.578	16	19	24	2-4	.385
11	Los Angeles Angels	.537	2	3	.400	.582	7	14	17	2-3	.404
12	Cleveland Indians	.537	2	3	.400	.582	9	17	20	2-3	.419
13	Arizona Diamondbacks	.537	3	2	.600	.516	29	23	19	3-2	.594
14	Miami Marlins	.532	1	4	.200	.642	14	13	27	1-4	.188
15	Baltimore Orioles	.505	3	2	.600	.473	8	24	22	3-2	.543
16	Chicago White Sox	.495	1	4	.200	.593	13	12	31	1-4	.130
17	Minnesota Twins	.495	1	4	.200	.593	26	11	27	1-4	.142
18	Los Angeles Dodgers	.463	2	3	.400	.484	2	19	24	2-3	.385
19	New York Yankees	.447	1	4	.200	.529	18	17	29	1-4	.256
20	San Diego Padres	.442	3	3	.500	.422	10	25	19	4-2	.634
21	Oakland Athletics	.438	3	3	.500	.417	19	36	18	5-1	.800
22	Texas Rangers	.438	3	3	.500	.417	25	20	27	2-4	.354
23	Toronto Blue Jays	.425	3	2	.600	.367	11	28	20	3-2	.662
24	Tampa Bay Rays	.408	2	3	.400	.411	24	20	22	2-3	.452
25	New York Mets	.377	2	3	.400	.369	17	16	16	3-3	.500
26	Seattle Mariners	.349	2	3	.400	.333	5	12	24	1-4	.200
27	Houston Astros	.349	2	3	.400	.333	23	10	14	2-3	.338
28	Milwaukee Brewers	.305	1	4	.200	.340	21	14	26	1-4	.225
29	Pittsburgh Pirates	.305	1	4	.200	.340	4	14	21	2-3	.308
30	Washington Nationals	.250	1	4	.200	.267	1	9	17	1-4	.219

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.