Free tools
Free tool
Elo calculator.
See how a result changes your rating. The formula is the standard Elo expectation curve; K-factor controls how quickly ratings move.
Result
Expected score
50.0%
Against a 1500-rated opponent, a 1500-rated player is expected to score about 50 points per 100 games.
Rating change+16.0
New rating1516
K-factor comparison
KChangeNew rating
K = 10 +5.0 1505
K = 20 +10.0 1510
K = 32 +16.0 1516
K = 40 +20.0 1520
Elo is a statistical model, not a promise. Online sites use different K-factors, provisional ratings and rating floors, so your platform rating may move by a different amount. FIDE rounds the final change to the nearest integer.