Tournament Bracket Size Calculator
Plans the shape of a knockout tournament.
Bracket size
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Share sends a link that reopens these numbers. Copy details pastes the full breakdown as a list.
Byes in round one —
Rounds, single elimination —
Matches, single elimination —
Matches, double elimination, plus one if a final reset is played —
Swiss rounds to find one clear winner —
Matches, round robin —
Round by round
The formula
bracket size = the next power of 2 at or above the entrants byes = size − entrants matches = entrants − 1
Every match knocks out one player, and all but one must go out. In double elimination each player but the winner loses twice.
What to watch out for
Byes normally go to the top seeds. Round one is the only round that is short of players.
Frequently Asked Questions
How many byes do 13 entrants need?
3 in a bracket of 16, with 12 matches in all.
How many rounds for 64 players?
6 rounds and 63 matches.