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Tournament Bracket Size Calculator

Work out tournament bracket size instantly with clear inputs, formula shown and shareable results.

About Tournament Bracket Size Calculator

The bracket is the next power of two at or above the entry count, byes fill the gap, and a single-elimination event always needs entrants minus one matches to find a winner. The entrants-minus-one rule holds because every match eliminates exactly one team, which is why bracket size affects byes but never the match count.

Formulas

Bracket size

bracket = 2 ^ ceiling(log2(entrants))

Matches

matches = entrants - 1, plus one for a third place playoff

Worked example

With the default values below, Tournament Bracket Size Calculator returns Bracket size of 16. Change any input above and every figure here is recalculated in your browser.

Inputs used

Number of entrantsminimum 2
12
Include a third place playoff
Yes

Results

Bracket size
16
First round byes
4
Rounds to a winner
4
Matches to be played
12

Step by step

  1. 1Values used
  2. 2Bracket size
  3. 3Matches
  4. 4Bracket size= 16
  5. 5First round byes= 4
  6. 6Rounds to a winner= 4
  7. 7Matches to be played= 12

Assumptions and limits

  • The result is derived only from the 2 inputs listed above. Anything not among them is not part of the calculation.
  • In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
  • Figures are rounded for display to whole numbers, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Frequently Asked Questions

How is the Tournament Bracket Size figure worked out?

bracket = 2 ^ ceiling(log2(entrants)). The bracket is the next power of two at or above the entry count, byes fill the gap, and a single-elimination event always needs entrants minus one matches to find a winner.

Why does this matter?

The entrants-minus-one rule holds because every match eliminates exactly one team, which is why bracket size affects byes but never the match count.

What do I need to enter?

Enter number of entrants, include a third place playoff. The defaults shown are a realistic worked example — swap in your own figures to get a result you can use.

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