Use this free chess accuracy calculator and checker to score games from Chess.com, Lichess, or PGN. Compare your result by rating and see how closely your moves matched Stockfish.
What Chess Accuracy Means
Chess accuracy estimates how closely your moves follow the engine line. A higher score means you stayed closer to the best moves throughout the game.
The number is most useful when you compare it against your own rating, your time control, and your previous games. A 78 percent game can be excellent for one player and disappointing for another.
Good Chess Accuracy by Rating
Use these ranges as a baseline, not as a strict rule:
| Rating range | Typical accuracy | What it usually means |
|---|---|---|
| Under 800 | 50-60% | Many blunders are normal while basic patterns are still forming. |
| 800-1200 | 60-70% | Major mistakes start dropping, but tactical misses are still common. |
| 1200-1600 | 70-80% | More stable play with fewer large evaluation swings. |
| 1600-2000 | 80-88% | Good positional play and cleaner conversion in simpler positions. |
| 2000-2400 | 85-92% | Strong precision with fewer unforced errors. |
| 2400+ | 90-98% | Master-level accuracy with only small losses in hard positions. |
Time pressure, sharp openings, and winning or defending difficult endgames can move these numbers up or down.
What Changes Your Accuracy
- Time control — Bullet and blitz usually produce lower accuracy than rapid or classical because you simply have less time to calculate.
- Position type — Wild tactical positions punish one inaccurate move much harder than calm endgames.
- Game state — Winning positions can still lead to low accuracy if the engine sees cleaner conversions than the moves you chose.
- Opponent pressure — Strong opposition creates more practical mistakes even when the position is theoretically holdable.
Is 80% Accuracy Good in Chess?
It depends on your rating. As a rough guide: 80% is good around 1200-1600, 87% is strong club-to-expert play, 90% is very clean, and 92%+ is master-level precision. At beginner level 80% is excellent; for a master it would be a slightly off day. Compare your score to the rating table above rather than to a single fixed target.
How Is Chess Accuracy Calculated?
chess.rodeo uses engine evaluations rather than a simple blunder count:
- Stockfish evaluates each position and the best available move.
- Your played move is compared to that engine recommendation.
- The evaluation loss is converted into win-probability loss.
- Those losses are aggregated into a final accuracy score for the game.
Chess.com, Lichess, and chess.rodeo
Different platforms calculate accuracy differently. Chess.com uses CAPS, while chess.rodeo follows the Lichess-style win-probability approach.
That means the exact percentage may differ across sites, but the trend still matters. Track your games on the same platform if you want a stable measure of improvement.
Related Analysis Tools
- Free Chess Analysis — Compare unlimited analysis on chess.rodeo with Chess.com and Lichess.
- PGN Analyzer — Upload PGN files and review full games move by move with Stockfish.
- FEN Analyzer — Analyze a specific position when you care about one critical moment.