Chess Clock Calculator
Calculate time per move for any chess time control and increment.
Covers Bullet, Blitz, Rapid, and Classical with expected moves for Fischer and Bronstein.
A chess clock allocates each player a fixed amount of time for all their moves. When time runs out, the player loses (in most formats). Understanding time controls helps players budget moves intelligently across different phases of the game.
Key formulas:
Time per Move (even distribution): Time per Move = Total Time ÷ Expected Number of Moves
Remaining Time per Move: Time Remaining per Move = (Total Time − Time Used) ÷ Remaining Moves
Increment-adjusted time: Effective Time = Base Time + (Increment per Move × Expected Moves)
Fischer increment (most common): Each player receives bonus time after every move. Time After Move = Current Clock − Time Used on Move + Increment
What each variable means:
- Base Time — starting time for each player (e.g., 10 minutes).
- Increment — seconds added per move (e.g., 5 seconds per move).
- Expected Moves — average chess game lasts 40 moves; complex games can go 60–80 moves.
Common time control formats:
- Bullet: 1+0 or 2+1 (1–2 minutes base)
- Blitz: 3+2 or 5+0 (3–5 minutes base)
- Rapid: 10+0, 15+10, or 25+10
- Classical: 90+30 (90 minutes + 30 seconds per move)
- Correspondence: 1–3 days per move
Worked example (10+5 blitz game): Base = 10 minutes; increment = 5 seconds per move. Expected 40 moves.
Effective time = 10 min + (5 sec × 40 moves) = 10 min + 200 sec = 10 min + 3 min 20 sec = 13 min 20 sec effective
Time budget per move = 800 sec ÷ 40 moves = 20 seconds per move average
Moves 1–15 (opening): ~5 sec each. Moves 16–30 (middlegame): ~30 sec each. Last 10 moves: use remaining + increment.