Matchmaking Rating Calculator

Calculate Elo rating changes from match results.

Player Rating

Opponent Rating

K-Factor

Result (1=Win, 0.5=Draw, 0=Loss)

Tab to move between fields

New Rating

1,520

Rating Change20

Expected Win %36%

Change if Win20

Change if Loss-12

Change If Draw4

How to Use This Calculator

Enter the Player Rating and Opponent Rating on the Elo scale.
Enter the K-Factor: 16 for established players, 32 for standard, 64 for new/provisional accounts.
Enter the Match Result: 1 for win, 0.5 for draw, 0 for loss.
Review the New Rating and Rating Change after the match.
Check Expected Win percentage and Change If Win/Loss to understand the stakes before the match.

How the result changes with Player Rating

Player Rating: Current Elo rating of the player.
Opponent Rating: Elo rating of the opponent.
K-Factor: Rating sensitivity (16 = established, 32 = standard, 64 = provisional).
Result (1=Win, 0.5=Draw, 0=Loss): Match outcome: 1 for win, 0.5 for draw, 0 for loss.

Identify Input Parameters
4 parameters
Player Rating = 1500, Opponent Rating = 1600, K-Factor = 32, Result (1=Win, 0.5=Draw, 0=Loss) = 1 = 4 input(s) provided
Calculate New Rating
New Rating
1520 = 1520
Calculate Rating Change
Rating Change
20 = 20
Calculate Expected Win %
Expected Win %
36 = 36