Elo Rating Calculator
Computes the expected score between two Elo-rated players (1 / (1 + 10^((Rb−Ra)/400))) and the exact rating change for a win, draw or loss at your K-factor — the system used in chess and adapted everywhere from football rankings to matchmaking.
Read the full guide to this tool
Results
Notes
- A 100-point gap means the stronger player scores about 64%; 200 points about 76%; 400 points about 91%.
- Elo is self-correcting: beating players you were expected to beat barely moves your rating.
- Educational estimate for sport and training purposes, not professional coaching or medical advice.
Related tools
Playoff Series Probability Calculator
Chance of winning a best-of-3/5/7 series from your single-game win probability.
Soccer Score Simulator (Poisson)
Win/draw/loss and most likely scorelines from two expected-goals numbers.
Badminton Match Probability Calculator
From serve-rally win % to game and match probability with the 30-point cap.
League Season Simulator
Monte Carlo the rest of the season: title, top-N and relegation odds from the current table.
Squash Match Probability Calculator
From serve-rally win % to game and match probability with PAR-11 scoring.
Table Tennis Match Probability Calculator
From serve-point win % to game, deuce and match probability for best-of-3/5/7.