Chess Clock Time Calculator
Add base minutes and per move increment to get total game time for a move count.
What it does
Chess time controls read like 60 plus 30, yet the real question is how long one player can think across a whole game. Base minutes plus increment per move times moves gives that total, which sets hall bookings and broadcast slots.
The tool above takes base minutes each, increment seconds per move, and planned moves. It returns total time each, total minutes, and increment share, so a 60 plus 30 event with 40 moves reads as 80 minutes a side.
This math fits sudden death with increment from move one. It does not fit multi period controls with a second time scramble at move 40, nor delay clocks where seconds pause instead of adding.
Federation guidance uses the same sum with 60 moves as the reference: G/90 plus 30 seconds equals 120 minutes a side since 60 times 30 seconds adds 30 minutes. Online servers use 40 moves for quick labels such as 5 plus 3.
Plan with 40 moves for club nights and 60 for rated filings. Most games end before either count, so the totals are ceilings, not promises.
How to use
- Enter base minutes each side starts with.
- Enter increment seconds added after each move.
- Enter planned moves, 40 for club or 60 for rated math.
- Read total time each for the schedule block.
- Read total minutes for pairing math.
- Read increment share to see bonus weight.
Formula
- base
- Starting minutes each side.
- increment
- Bonus seconds added per move played.
- moves
- Planned move count for the estimate.
Increment applies from move one in this model. Zero increment returns base as the total. Delay clocks differ since delay pauses rather than adds, so they need their own page.
Worked example
Example: 60 minutes plus 30 seconds for 40 moves
Base 60 minutes, increment 30 seconds, moves 40.
- Increment minutes: 30 x 40 / 60 = 20 min.
- Total: 60 + 20 = 80 min.
- Clock read: 80 minutes is 1 h 20 min.
- Share: 20 / 80 x 100 = 25.0 %.
- Tool shows total 1 h 20 min, 80 min, share 25.0 %.
Reference table
| Control | Increment minutes | Total each |
|---|---|---|
| 10 plus 5 | 3.3 min | 13.3 min |
| 60 plus 30 | 20 min | 80 min |
| 90 plus 30 | 20 min | 110 min |
Limits
- Sudden death with increment only. Multi period controls differ.
- Increment from move one. Late start increments need custom math.
- Delay clocks pause instead of adding, so totals differ.
- Real games vary in length, so totals are planning ceilings.
Common mistakes
- Mixing seconds and minutes without dividing by 60.
- Using delay rules for an increment event.
- Planning hall time for one side instead of both.
- Forgetting that 40 move totals understate long endgames.
- Reading share as extra time beyond the total.
Try it yourself
Quick checks. Answers sit tucked under each question.
10 minutes plus 5 seconds for 40 moves?
Total 0 h 13 min, 13.3 min, increment share 25.0 %.
90 minutes plus 0 for 40 moves?
Total 1 h 30 min, 90 min, increment share 0.0 %.
5 minutes plus 3 seconds for 40 moves?
Total 0 h 07 min, 7 min, increment share 28.6 %.
Questions
How is chess game time figured?
Base minutes plus increment seconds times moves divided by 60. 60 plus 30 for 40 moves is 80 minutes.
What does 5 plus 3 mean?
5 base minutes plus 3 bonus seconds per move. Online servers label by estimated duration at 40 moves.
Increment vs delay?
Increment adds seconds to the clock, delay pauses counting. Totals here fit increment only.
Why 40 or 60 moves?
40 is the online planning standard, 60 is the federation filing standard for rated totals.
How long should I book the hall?
Double one side total for both players, then add setup and tiebreak buffer.
Does unused increment carry?
Yes, unspent bonus stays on the clock up to the game end under increment rules.