Elo Calculator
Single-game rating change with live win expectancy — exact FIDE formula, including the 400-point rule.
Game Setup
Every change recalculates instantly
Result
K-Factor
Rating System
New Rating
1811.4
+11.4rating points
Win Expectancy
Model probabilities before the game
You wins 27.1%draw 31.5%Opponent wins 41.4%
Expected score0.429
Actual score1
Δ = K × (W − We) = 20 × (1 − 0.429)+11.43