PORT CALCULATOR
Elo Calculator
Calculate your new Elo rating after a match with our professional Elo sports calculator.
What is the Elo Calculator & How does it work?
The Elo rating system is a method for calculating the relative skill levels of players in two-player games such as chess. It was invented by Arpad Elo, a Hungarian-American physics professor.
The formula to calculate the new rating after a match is:
R’ = R + K(S – E)
R = current rating
K = scaling factor (commonly 32)
S = score of the game (1 for a win, 0.5 for a draw, 0 for a loss)
E = expected score based on opponent’s rating
K = scaling factor (commonly 32)
S = score of the game (1 for a win, 0.5 for a draw, 0 for a loss)
E = expected score based on opponent’s rating
The expected score is calculated using:
E = frac{1}{1 + 10^{frac{(R_{opponent} – R)}{400}}}
R = your current rating
R_{opponent} = opponent’s rating
R_{opponent} = opponent’s rating
Parameters
New Rating:—
Frequently Asked Questions
How do I calculate my new Elo rating?
Use the formula R’ = R + K(S – E), where R is your current rating, K is the scaling factor (usually 32), S is your game score (1 for a win, 0.5 for a draw, 0 for a loss), and E is the expected score based on your opponent’s rating.
What is the expected score in Elo ratings?
The expected score (E) is calculated using the formula E = 1 / (1 + 10^((R_opponent – R_player) / 400)), where R_opponent and R_player are the ratings of the opponent and player, respectively.
Can I use this calculator for games other than chess?
Yes, the Elo rating system can be applied to any two-player game, though the specific scaling factor (K) might vary depending on the game.
What does the K value represent in the Elo formula?
The K value is a scaling factor that determines how much a player’s rating changes after each game. It is typically set to 32 for most games, but can be adjusted based on the level of play or other factors.
How often should I update my Elo rating?
Your Elo rating should be updated immediately after each completed game using the Elo formula to reflect the outcome accurately.
Results are for informational purposes only and do not constitute professional advice.