2015 MLB Relative Power Index (RPI),as of the games of July 25,2015

MLB RPI Rankings
RK	TEAM	RPI	W	L	PCT	SOS	PWR	RS	RA	EXPW-L	EXPWP
1	St. Louis Cardinals	.544	63	34	.649	.508	1	391	283	64-33	.656
2	Kansas City Royals	.536	58	38	.604	.513	3	415	349	56-40	.586
3	Pittsburgh Pirates	.519	56	41	.577	.499	2	392	342	55-42	.568
4	Chicago Cubs	.517	51	45	.531	.512	10	364	357	49-47	.510
5	New York Yankees	.516	54	42	.563	.500	7	443	414	51-45	.534
6	Minnesota Twins	.514	52	45	.536	.507	8	411	398	50-47	.516
7	Los Angeles Angels	.513	54	43	.557	.498	6	410	355	55-42	.572
8	Houston Astros	.512	55	44	.556	.498	9	436	365	58-41	.588
9	Los Angeles Dodgers	.510	56	43	.566	.492	4	411	350	57-42	.580
10	Detroit Tigers	.510	48	49	.495	.515	16	439	453	47-50	.484
11	Chicago White Sox	.503	45	50	.474	.513	21	334	395	40-55	.417
12	Washington Nationals	.502	52	44	.542	.489	5	409	377	52-44	.541
13	San Francisco Giants	.499	53	44	.546	.483	11	422	373	54-43	.561
14	New York Mets	.499	50	48	.510	.495	12	346	353	48-50	.490
15	Toronto Blue Jays	.498	50	49	.505	.496	15	523	427	59-40	.600
16	Tampa Bay Rays	.497	49	50	.495	.498	14	349	369	47-52	.472
17	Texas Rangers	.497	47	49	.490	.500	22	416	438	46-50	.474
18	San Diego Padres	.497	46	52	.469	.506	25	375	430	42-56	.432
19	Cleveland Indians	.497	45	51	.469	.506	17	374	416	43-53	.447
20	Seattle Mariners	.496	45	53	.459	.508	23	353	404	42-56	.433
21	Baltimore Orioles	.495	47	49	.490	.497	13	416	378	53-43	.548
22	Milwaukee Brewers	.493	43	55	.439	.511	28	396	435	44-54	.453
23	Oakland Athletics	.492	44	55	.444	.508	24	418	380	54-45	.548
24	Arizona Diamondbacks	.489	45	51	.469	.496	18	419	422	48-48	.496
25	Cincinnati Reds	.486	43	52	.453	.497	26	377	418	43-52	.449
26	Boston Red Sox	.483	43	55	.439	.498	19	392	464	41-57	.416
27	Atlanta Braves	.481	45	52	.464	.486	20	366	411	43-54	.442
28	Colorado Rockies	.474	41	54	.432	.488	27	419	488	40-55	.424
29	Miami Marlins	.472	41	57	.418	.490	29	356	383	45-53	.464
30	Philadelphia Phillies	.461	36	63	.364	.494	30	345	490	33-66	.331

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.