2017 MLB Relative Power Index (RPI),as of the games of August 27,2017 from ESPN.GO.COM

MLB RPI Rankings
RK	TEAM	RPI	W	L	PCT	SOS	PWR	RS	RA	EXPW-L	EXPWP
1	Los Angeles Dodgers	.548	91	38	.705	.496	0	645	426	90-39	.696
2	Houston Astros	.528	79	51	.608	.502	0	727	561	81-49	.627
3	Washington Nationals	.517	78	51	.605	.488	0	678	546	78-51	.607
4	Arizona Diamondbacks	.516	73	58	.557	.502	0	634	532	77-54	.587
5	Cleveland Indians	.516	73	56	.566	.499	0	634	489	81-48	.627
6	Boston Red Sox	.514	73	57	.562	.498	0	624	541	74-56	.571
7	Colorado Rockies	.513	71	59	.546	.502	0	669	620	70-60	.538
8	New York Yankees	.511	70	59	.543	.500	0	676	541	79-50	.610
9	Los Angeles Angels	.505	66	65	.504	.506	0	563	565	65-66	.498
10	Chicago Cubs	.505	69	60	.535	.495	0	642	574	72-57	.556
11	Baltimore Orioles	.505	65	65	.500	.507	0	633	656	63-67	.482
12	Minnesota Twins	.504	67	63	.515	.500	0	624	652	62-68	.478
13	Milwaukee Brewers	.501	68	63	.519	.495	0	596	577	68-63	.516
14	Tampa Bay Rays	.501	65	67	.492	.504	0	566	577	65-67	.490
15	St. Louis Cardinals	.500	65	65	.500	.501	0	611	571	69-61	.534
16	Seattle Mariners	.500	66	65	.504	.499	0	607	630	63-68	.481
17	Kansas City Royals	.499	64	65	.496	.500	0	560	606	59-70	.461
18	Texas Rangers	.498	64	66	.492	.500	0	651	630	67-63	.516
19	Miami Marlins	.497	66	63	.512	.492	0	615	621	64-65	.495
20	Toronto Blue Jays	.495	61	69	.469	.503	0	554	646	55-75	.424
21	Pittsburgh Pirates	.492	63	68	.481	.496	0	555	602	60-71	.459
22	Oakland Athletics	.490	58	72	.446	.504	0	576	673	55-75	.423
23	San Diego Padres	.486	57	73	.438	.502	0	498	653	48-82	.368
24	Detroit Tigers	.486	56	73	.434	.503	0	615	685	58-71	.446
25	New York Mets	.484	57	73	.438	.499	0	599	663	58-72	.449
26	Cincinnati Reds	.483	55	76	.420	.503	0	622	730	55-76	.421
27	Atlanta Braves	.482	57	71	.445	.495	0	585	656	57-71	.443
28	Chicago White Sox	.480	52	77	.403	.505	0	558	656	54-75	.420
29	San Francisco Giants	.477	52	80	.394	.504	0	524	645	52-80	.398
30	Philadelphia Phillies	.466	48	81	.372	.498	0	530	647	52-77	.402

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.