About the Tournament Bracket Generator
This tournament bracket generator turns a list of players or teams into a ready-to-run knockout bracket. Paste one name per line in seed order (best first), choose single or double elimination, and it works out the bracket size, how many byes are needed, the number of rounds and total matches, and every first-round pairing. The table then lays out each round, carrying bye winners straight through so you can see who meets whom.
It is built for organisers of school and club sports days, esports and video-game nights, chess and table-tennis knockouts, pub quizzes, office ping-pong and March-Madness-style office pools. You can print the matchups or copy them into a spreadsheet or group chat.
Seeding follows the standard method used by most sports: the top seed plays the lowest seed, and the top two seeds can only meet in the final. When the field is not a power of two (4, 8, 16, 32…), the highest seeds receive first-round byes. If you prefer to pair names exactly as listed, switch seeding to “in listed order”.
With the default inputs, the total matches (maximum) is 5. Change any value above to recalculate instantly.
How to use the tournament bracket generator
- 1Paste the players or teams, one per line, with the strongest first.
- 2Choose single or double elimination.
- 3Keep standard seeding, or pick “in listed order” to pair names as written.
- 4Read the first-round matchups and the total number of matches to plan your schedule.
- 5Use the round-by-round table to fill in winners as the event progresses.
Formula and method
A knockout bracket must have a power-of-two number of slots, so the size is the smallest power of two at or above the number of entrants n, and the empty slots become byes. The number of rounds is log₂ of the size. Because each single-elimination match knocks out exactly one entrant and all but one must be eliminated, there are always n − 1 matches.
In double elimination every entrant except the champion must lose twice, which gives 2n − 2 matches, plus one more if the grand final is reset. Standard seeding places seeds so that the sum of each first-round pair is size + 1 (1 v 8, 4 v 5, 2 v 7, 3 v 6 in an 8-slot bracket), which keeps the top seeds apart until the late rounds and hands byes to the highest seeds.
- n
- Number of entrants
- size
- Bracket slots (next power of two)
- byes
- Free passes into round 2
Worked examples
Six teams, single elimination
Six entrants need an 8-slot bracket, leaving 2 byes for the top two seeds. Seeds 4 v 5 and 3 v 6 play in round 1; the winners meet the Lions and the Tigers in the semifinals. Five matches decide the champion.
Six teams, double elimination with reset
Double elimination needs 2 × 6 − 2 = 10 matches, plus one possible grand-final reset for a maximum of 11. With an 8-slot bracket the losers bracket runs 2 × (3 − 1) = 4 rounds.
16-player knockout
Sixteen is a power of two, so there are no byes. Four rounds (round of 16, quarterfinals, semifinals, final) and 15 matches produce a winner.
Frequently asked questions
How many byes do I need in a tournament bracket?+
Find the next power of two at or above the number of entrants and subtract. For example, 12 teams need a 16-slot bracket, so 4 teams get byes. With standard seeding the byes go to the top seeds.
How many games are in a single elimination tournament?+
Always one fewer than the number of entrants. Each game eliminates one team and every team but the champion must be eliminated, so 64 teams play 63 games and 10 teams play 9 games.
How many games are in a double elimination tournament?+
A double elimination event with n entrants takes 2n − 2 games, or 2n − 1 if the losers-bracket winner beats the unbeaten team in the grand final and forces a reset. Eight teams therefore play 14 or 15 games.
How does bracket seeding work?+
In a standard seeded bracket the best seed plays the worst, the second seed plays the second worst, and so on, with the pairs placed so that seeds 1 and 2 can only meet in the final and seeds 1–4 only from the semifinals.
What is the difference between single and double elimination?+
In single elimination one loss knocks you out. In double elimination a first loss drops you into a losers bracket, and you are only out after a second loss, which rewards consistency but roughly doubles the number of matches.
Should I use a round robin instead?+
A round robin, where everyone plays everyone, is fairer for small groups of up to about 8 but needs n(n − 1)/2 games. Knockout brackets suit bigger fields or a single day. Use the round robin generator for league schedules.