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About this tool
Track a persistent Elo rating ladder for friendly matches.
Friend ELO Ladder runs the standard Elo rating formula over a list of casual matches and returns a ranked ladder plus the rating after every game. It uses the textbook maths — expected score E = 1 / (1 + 10^((Rb − Ra) / 400)) and the update R' = R + K × (S − E), with players starting at 1200 and a K-factor of 32 by default — so beating someone stronger moves you further than beating someone weaker. It is for friend groups, office leagues and club nights who want a fair running order for chess, table tennis, pool or FIFA without signing up to a league platform.
Open Friend ELO Ladder on AltFTool — it loads instantly in your browser.
Enter Starting ratings as "Name | rating", one per line, then Matches in order as "Player A | Player B | A score (1 win, 0.5 draw, 0 loss)", and set the K-factor, which defaults to 32.
Matches are processed in the order listed using E = 1 / (1 + 10^((Rb − Ra) / 400)) and R' = R + K × (S − E); anyone named in a match but absent from the ratings list joins the ladder at 1200.
A Rank / Player / Elo table gives the final standings, with one line per match showing both updated ratings and a note for any skipped line; Copy and Download take the ladder away.
Elo weights each result by the rating gap, so wins against stronger players are worth more than padding a record against beginners.
The output lists each match with both players' updated ratings afterwards, so anyone can check how the ladder was arrived at.
Scores accept 1, 0.5 or 0, and you can seed players with existing ratings instead of restarting everyone at 1200.
Each player's expected score comes from the rating gap: E = 1 / (1 + 10^((opponent − player) / 400)), so a 400-point lead implies about a 91% expected score. After the game the rating changes by K × (actual − expected), where actual is 1 for a win, 0.5 for a draw and 0 for a loss.
32 is the default and suits casual ladders because ratings settle quickly — a win between equally rated players moves each by 16 points. Lower values like 16 or 10 make ratings more stable and are used for established or high-rated players; you can set any value from 1 upward.
1200. Anyone named in a match but missing from the starting list is added at 1200 automatically, and you can override the starting figure for any player to carry a rating over from a previous season.
Yes — matches are processed in the order you list them, exactly as they would be in a real league, because each result updates the ratings used to compute the next expected score. Re-ordering the same set of games can give slightly different final numbers.