Tournament calculator
How many matches, rounds and byes to run your tournament.
How it works
Single elimination: n − 1 matches, rounds = ⌈log₂ n⌉. Double elimination: 2n − 2 matches (+1 for a grand final reset). Round robin: n(n − 1)/2 matches.
Results are for guidance only and do not replace professional advice.
Worked example
With the default values:
- Players or teams12
- FormatSingle elimination
- Match length (minutes)20
- Matches at the same time (courts, tables)2
you get:
- Number of matches11
- Rounds4
- First-round byes4
- Minimum duration2 h 00
Frequently asked questions
How does the “Tournament calculator” tool work?
Single elimination: n − 1 matches, rounds = ⌈log₂ n⌉. Double elimination: 2n − 2 matches (+1 for a grand final reset). Round robin: n(n − 1)/2 matches.
What do I need to enter?
Just fill in: players or teams, format, match length, matches at the same time. The result updates as you type.
Can you give an example?
Players or teams: 12; Format: Single elimination; Match length (minutes): 20; Matches at the same time (courts, tables): 2 → Number of matches: 11; Rounds: 4.
Is this calculator free, and is my data private?
Yes. HOD Calc is completely free with no sign-up. The calculation runs in your browser: nothing you type is sent or stored.