2017 MLB Relative Power Index (RPI),as of the games of June 18,2017 from ESPN.GO.COM

MLB RPI Rankings

RK	TEAM	RPI	W	L	PCT	SOS	PWR	RS	RA	EXPW-L	EXPWP
1	Houston Astros	.546	46	24	.657	.509	0	379	273	46-24	.658
2	Colorado Rockies	.536	46	26	.639	.501	0	383	308	44-28	.607
3	Los Angeles Dodgers	.529	44	26	.629	.496	0	348	250	46-24	.660
4	Arizona Diamondbacks	.529	44	26	.629	.496	0	359	270	45-25	.639
5	New York Yankees	.522	38	29	.567	.507	0	383	275	44-23	.660
6	Cleveland Indians	.521	36	31	.537	.516	0	315	277	38-29	.564
7	Baltimore Orioles	.515	34	34	.500	.520	0	313	358	29-39	.433
8	Boston Red Sox	.515	39	30	.565	.498	0	322	293	38-31	.547
9	Tampa Bay Rays	.510	37	35	.514	.509	0	343	326	38-34	.525
10	Washington Nationals	.506	42	27	.609	.472	0	378	309	41-28	.599
11	Minnesota Twins	.505	34	33	.507	.504	0	312	356	29-38	.434
12	Texas Rangers	.504	34	34	.500	.506	0	331	318	35-33	.520
13	Milwaukee Brewers	.503	38	33	.535	.493	0	347	330	37-34	.525
14	Seattle Mariners	.502	34	37	.479	.510	0	338	350	34-37	.483
15	Kansas City Royals	.502	33	35	.485	.508	0	269	302	30-38	.442
16	Detroit Tigers	.502	32	36	.471	.512	0	330	339	33-35	.487
17	Los Angeles Angels	.501	36	37	.493	.504	0	309	312	36-37	.495
18	Toronto Blue Jays	.497	33	35	.485	.501	0	291	308	32-36	.472
19	Oakland Athletics	.497	31	38	.449	.513	0	298	369	27-42	.395
20	Chicago Cubs	.495	34	34	.500	.493	0	323	311	35-33	.519
21	Chicago White Sox	.493	31	37	.456	.505	0	314	310	34-34	.506
22	San Diego Padres	.488	28	42	.400	.518	0	256	369	23-47	.325
23	Pittsburgh Pirates	.485	31	38	.449	.497	0	289	331	30-39	.433
24	St. Louis Cardinals	.485	31	37	.456	.494	0	292	308	32-36	.473
25	Miami Marlins	.476	30	37	.448	.486	0	318	321	33-34	.495
26	San Francisco Giants	.475	26	45	.366	.512	0	265	347	26-45	.368
27	New York Mets	.471	31	37	.456	.476	0	331	359	31-37	.459
28	Cincinnati Reds	.468	29	39	.426	.483	0	334	362	31-37	.460
29	Atlanta Braves	.464	31	37	.456	.467	0	315	354	30-38	.442
30	Philadelphia Phillies	.454	22	46	.324	.497	0	263	353	24-44	.357

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.