Strength of Schedule Calculator
Measure how tough a team’s schedule is from the combined win–loss record of its opponents — the simple opponents’ winning-percentage method.
How it works
SOS = opponents’ wins ÷ (opponents’ wins + opponents’ losses)
The simplest strength-of-schedule measure is just the combined winning percentage of every team you have faced. A value above .500 means your opponents win more than they lose, so your schedule has been harder than average; below .500 means it has been easier. It ignores game-by-game context and opponents-of-opponents, but it is the transparent baseline most standings and tiebreakers start from.
Worked example
If your opponents have a combined record of 85 wins and 77 losses, the strength of schedule is 85 ÷ (85 + 77) = 85 ÷ 162 = 0.525 — a schedule a touch tougher than average.
Frequently asked questions
What is a hard schedule number?
Anything meaningfully above 0.500 is harder than average. Roughly, 0.520+ is tough and 0.550+ is very tough, while 0.480 or below is a soft slate.
Is this the same as the NFL or RPI formula?
No. This is the basic opponents’ winning-percentage method. The NFL’s official SOS and the college RPI weight opponents and even opponents’ opponents; this calculator gives the underlying first-order number.
Should I include ties?
Count a tie as half a win and half a loss (add 0.5 to each side) before entering the totals, matching how winning percentage normally treats ties.
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This calculator is for educational purposes. Double-check important results before acting on them.