Chess Rating Calculator: Elo

Know exactly how your chess rating will change — before it's official.

Chess Rating Calculator is a fast, clean tool that computes your Elo rating change using the same formula trusted by FIDE and chess federations worldwide. Whether you just won a single game or finished a full tournament, get your new rating in a tap.

★ SINGLE GAME MODE
Enter your rating, your opponent's rating, and the result (win, draw, or loss). Instantly see:
- Your new rating and exact points gained or lost
- Your win probability shown on a live gauge
- Expected score vs. actual score

★ TOURNAMENT MODE
Add every opponent you faced, mark each result, and calculate your total rating change across all rounds at once — perfect for swiss events and club tournaments.

★ FLEXIBLE K-FACTORS
Choose the K-factor that fits you:
- 40 — new players and juniors
- 20 — standard rated players
- 10 — masters (2400+)
- 32 — USCF style
Or enter a custom value in tournament mode.

★ BUILT FOR SPEED
- Clean, modern Material Design interface
- Automatic light and dark mode
- Works fully offline — no account, no ads, no tracking
- Lightweight and instant

★ LEARN AS YOU GO
The built-in Info tab explains the Elo formula and how K-factors work, so you understand every number.

Perfect for club players, tournament competitors, coaches, and anyone who wants to track and predict their chess rating.

Note: Results are estimates based on the standard Elo formula. Official ratings may vary slightly due to federation-specific rounding, rating floors, and policies.

Download now and take control of your chess rating!