Current 2014 MLB Relative Power Index (RPI), as of the games of May 17,2014

MLB RPI Rankings
RK	TEAM	RPI	W	L	PCT	SOS	PWR	RS	RA	EXPW-L	EXPWP
1	Detroit Tigers	.554	26	12	.684	.511	1	183	132	25-13	.658
2	San Francisco Giants	.536	27	17	.614	.510	2	184	160	25-19	.569
3	Oakland Athletics	.519	27	16	.628	.482	3	222	137	31-12	.724
4	Atlanta Braves	.517	22	19	.537	.510	7	129	129	21-21	.500
5	Milwaukee Brewers	.516	27	16	.628	.479	4	167	155	23-20	.537
6	Miami Marlins	.516	23	21	.523	.513	11	203	180	25-19	.560
7	Minnesota Twins	.515	21	20	.512	.517	26	193	202	20-21	.477
8	San Diego Padres	.515	21	23	.477	.528	27	133	154	19-25	.427
9	Los Angeles Dodgers	.515	23	21	.523	.512	8	189	190	22-22	.497
10	Baltimore Orioles	.514	22	19	.537	.507	6	161	167	20-21	.482
11	Los Angeles Angels	.511	23	19	.548	.499	12	208	172	25-17	.594
12	Washington Nationals	.510	22	20	.524	.505	9	166	166	21-21	.500
13	Colorado Rockies	.508	24	20	.545	.496	5	241	192	27-17	.612
14	Boston Red Sox	.506	20	22	.476	.516	13	173	181	20-22	.477
15	Kansas City Royals	.503	21	21	.500	.504	20	158	157	21-21	.503
16	New York Yankees	.503	22	19	.537	.491	10	181	188	20-21	.481
17	Seattle Mariners	.499	20	22	.476	.506	16	172	169	21-21	.509
18	Cleveland Indians	.498	19	24	.442	.517	21	177	196	19-24	.449
19	New York Mets	.496	20	22	.476	.503	23	170	176	20-22	.483
20	Toronto Blue Jays	.496	23	21	.523	.487	17	213	202	23-21	.526
21	Chicago White Sox	.489	21	23	.477	.493	18	217	222	21-23	.489
22	St. Louis Cardinals	.487	23	20	.535	.471	14	163	151	23-20	.538
23	Texas Rangers	.483	20	23	.465	.490	15	169	206	17-26	.402
24	Philadelphia Phillies	.483	18	22	.450	.494	25	156	182	17-23	.424
25	Tampa Bay Rays	.480	19	25	.432	.496	24	177	195	20-24	.452
26	Cincinnati Reds	.477	19	22	.463	.482	19	147	146	21-20	.503
27	Pittsburgh Pirates	.476	17	24	.415	.496	22	159	178	18-23	.444
28	Houston Astros	.475	15	28	.349	.517	30	153	212	15-28	.342
29	Arizona Diamondbacks	.467	17	28	.378	.497	28	178	240	16-29	.355
30	Chicago Cubs	.444	14	27	.341	.478	29	162	167	20-21	.485

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.