A Swiss tournament needs the base-two logarithm of its entrant count, rounded up: 8 players take 3 rounds, 16 take 4, 32 take 5, 64 take 6, 128 take 7, and 256 take 8.
Round up to the next power of two and count the exponent. A 40-player event takes 6 rounds, the same as 64, because 5 rounds could leave more than one undefeated player. A 100-player event takes 7. The calculator on this page returns the number and the total match load for any entrant count.
Run the recommended rounds to sort the field by record, then take the top finishers into an elimination playoff. A top 8 double-elimination cut is the usual choice, and Brackify runs that stage as a live bracket with a shareable link.
A 64-player Swiss tournament needs 6 rounds. Two to the power of 6 is 64, so 6 rounds leave exactly one undefeated player.
A 256-player Swiss tournament needs 8 rounds, because two to the power of 8 is 256.
A 128-player Swiss tournament needs 7 rounds.
A 32-player Swiss tournament needs 5 rounds.
A Swiss tournament runs a fixed number of rounds, pairing players with similar records each round. Nobody is eliminated, everyone plays every round, and players are ranked by record at the end.
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