here's the 2015 strength of schedule for each NFL team (Combined 2014 record of all 16 opponents, combined winning percentage)
1. Pittsburgh Steelers: 147-107-2, .579
2. St. Louis Rams: 147-108-1, .576
3. Cincinnati Bengals: 144-112, .563
4. Seattle Seahawks: 142-112-2, .559
5. Arizona Cardinals:142-113-1, .557
T-6. Oakland Raiders: 139-116-1, .545
T-6. Kansas City Chiefs: 139-116-1, .545
8. Cleveland Browns: 138-116-2, .543
9. Denver Broncos: 138-117-1, .541
10. Baltimore Ravens: 137-117-2, .539
11. Minnesota Vikings: 138-118, .539
12. San Francisco 49ers: 137-118-1, .537
13. Chicago Bears: 136-120, .531
14. Green Bay Packers: 135-120-1, .529
15. Detroit Lions: 135-121, .527
16. San Diego Chargers: 132-123-1, .518
17. Miami Dolphins: 126-130, .492
18. New York Jets: 125-131, .488
19. Buffalo Bills: 124-131-1, .486
T-20. Washington Redskins: 122-133-1, .478
T-20. New York Giants: 122-133-1, .478
22. New England Patriots: 122-134, .477
23. Philadelphia Eagles: 121-134-1, .475
24. Dallas Cowboys: 119-136-1, .467
25. Jacksonville Jaguars: 118-137-1, .463
26. Tennessee Titans: 111-144-1, .435
27. Carolina Panthers: 111-145, .434
28. New Orleans Saints: 109-145-2, .429
29. Tampa Bay Buccaneers: 108-146-2, .425
30. Houston Texans: 106-148-2, .417
31. Indianapolis Colts: 106-149-1, .417
32. Atlanta Falcons: 104-150-2, .409