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GameCalc
See how a win, draw, or loss changes your rating.
The Elo system, invented by Arpad Elo, predicts the probability of winning based on rating differences — if you're rated 200 points higher than your opponent, the formula expects you to win about 76% of the time, and you gain fewer points for a predictable win than for an upset.
The K-factor determines how much a single game can change your rating — beginners use K=40 so their rating adjusts quickly to their true level, while established players use K=16 or K=32 for more stability.
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OpenLast updated: August 2026
New Rating
1,516
What you entered
Calculate expected score
1 / (1 + 10^((1500 - 1500) / 400))= 0.5Actual score from result
win = 1= 1Rating change
32 × (1 - 0.5)= +16New rating
1500 + (16)= 1,516Result
New Rating: 1,516