Chess ELO Rating Calculator
Instantly estimate your rating adjustments. Input your game details below to calculate the expected performance impact.
Game Configuration
Projected Rating Change
+0
New Rating (You)
New Rating (Opp)
Note: This tool uses the standard FIDE/USCF formula. The K-factor represents the maximum possible rating change per game. Higher values imply more rapid rating adjustments.
How it Works
Expected Score
The formula calculates an "expected score" based on the rating difference. If you beat a higher rated player, your gain is greater.
The K-Factor
This multiplier determines the sensitivity of your rating. FIDE typically uses 40 for new players (to stabilize) and 10-20 for established players.
Real-time Calculation
Our engine updates the projection instantly as you modify inputs, ensuring you always see accurate performance estimates.