2015 MLB Relative Power Index (RPI),as of the games of June 28,2015

MLB RPI Rankings
RK	TEAM	RPI	W	L	PCT	SOS	PWR	RS	RA	EXPW-L	EXPWP
1	St. Louis Cardinals	.546	51	24	.680	.501	1	309	211	51-24	.682
2	Kansas City Royals	.530	44	28	.611	.503	3	316	258	43-29	.600
3	New York Yankees	.519	41	35	.539	.512	7	363	339	41-35	.534
4	Chicago Cubs	.518	39	35	.527	.514	10	295	288	38-36	.512
5	Toronto Blue Jays	.514	41	36	.532	.508	9	420	332	47-30	.615
6	Houston Astros	.514	44	34	.564	.497	4	346	297	45-33	.576
7	Los Angeles Dodgers	.513	43	34	.558	.498	6	324	258	47-30	.612
8	Baltimore Orioles	.513	41	34	.547	.501	12	348	294	44-31	.584
9	Tampa Bay Rays	.512	42	35	.545	.501	5	283	267	41-36	.529
10	Detroit Tigers	.511	39	36	.520	.508	17	327	330	37-38	.495
11	Minnesota Twins	.508	40	35	.533	.500	15	313	309	38-37	.506
12	Los Angeles Angels	.506	39	37	.513	.504	14	296	300	37-39	.493
13	Pittsburgh Pirates	.505	42	33	.560	.486	2	298	252	44-31	.583
14	Washington Nationals	.500	42	34	.553	.483	13	336	307	41-35	.545
15	San Francisco Giants	.500	42	35	.545	.484	8	329	305	41-36	.538
16	San Diego Padres	.496	37	41	.474	.504	21	327	359	35-43	.453
17	Texas Rangers	.496	38	38	.500	.495	11	326	329	38-38	.495
18	Cleveland Indians	.495	33	41	.446	.511	20	291	330	32-42	.437
19	Seattle Mariners	.494	34	42	.447	.509	22	255	306	31-45	.410
20	Arizona Diamondbacks	.493	36	39	.480	.498	19	334	344	36-39	.485
21	New York Mets	.493	40	37	.519	.484	16	276	287	37-40	.480
22	Oakland Athletics	.490	34	44	.436	.509	24	348	308	44-34	.561
23	Boston Red Sox	.489	34	43	.442	.504	26	314	359	33-44	.433
24	Cincinnati Reds	.487	34	40	.459	.496	23	295	312	35-39	.472
25	Chicago White Sox	.487	32	42	.432	.505	28	257	338	27-47	.366
26	Milwaukee Brewers	.482	29	48	.377	.517	29	283	363	29-48	.378
27	Atlanta Braves	.481	36	40	.474	.483	18	304	331	35-41	.458
28	Colorado Rockies	.477	33	42	.440	.489	27	344	384	33-42	.445
29	Miami Marlins	.474	31	46	.403	.498	25	280	317	34-43	.438
30	Philadelphia Phillies	.460	27	50	.351	.497	30	256	379	24-53	.313

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.