Win Probability Calculator

Calculate Elo-based win probability and post-match rating updates for head-to-head competition.

Player/Team A Rating

Player/Team B Rating

K-Factor

Actual Result (A)

Home Advantage (Elo pts)

Tab to move between fields

Win Probability A

50%

Win Probability B50%

New Rating A1,516

New Rating B1,484

Rating Change A16

Rating Difference0

Implied Decimal Odds (A)2

Rating Change B-16

How to Use This Calculator

Enter the current Elo rating for Player/Team A and Player/Team B.
Set the K-Factor (32 for general use; chess uses 10-40, NBA/NFL ~20).
Select the Actual Result for Player A (Win, Draw, or Loss).
Optionally add Home Advantage in Elo points (NFL ~48, NBA ~100).
Review Win Probability, updated ratings after the match, and implied decimal odds.

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