Tournament brackets look complicated, but single elimination has a beautifully simple math: every team except the champion loses once, so the number of matches is just teams minus one.
Why it's teams minus one
Each match eliminates exactly one team. To go from N teams to one champion, N − 1 teams must be eliminated — so there are always N − 1 matches. That rule never changes regardless of bracket shape.
Rounds from powers of two
The number of rounds is how many halvings get you to one. Clean brackets use team counts that are powers of two; anything else introduces byes to round down to one.
Planning the schedule
Multiplying matches by average length gives the total time, and that's what makes or breaks a schedule. Between the match total and a realistic round time, a tournament's duration stops being a guess.
Frequently asked questions
Always teams − 1. A 16-team bracket needs 15 matches because only the champion avoids elimination.
Five rounds — the number of times you can halve 32 down to one (log base 2 of 32).
Byes are teams given a free first-round pass so the remaining teams form an even power of two. They usually go to the top seeds.