How to seed a tournament bracket

Updated November 1, 2026 · 4 min read · How we work

On this page

1. The basic rule: seeds always add up
2. Seed order for 8 and 16 teams
3. When the numbers don’t fit: byes
4. How to decide the seeds
5. Seeding a double elimination bracket
6. Seeding after pools

Seeding means ranking your entrants before the bracket is drawn, so the strongest are spread out and meet as late as possible. Done well, the final is between the two best teams and nobody’s day is decided by an unlucky draw.

The basic rule: seeds always add up

In a standard bracket, first-round pairings always add up to the bracket size plus one. In an 8-team bracket that’s 9: 1 v 8, 2 v 7, 3 v 6, 4 v 5. The best plays the worst, the second-best plays the second-worst, and so on.

The trick is where those games sit in the bracket. They’re arranged so that if the favourite wins every game:

• Seeds 1 and 2 meet only in the final.
• Seeds 1–4 meet only in the semifinals or later.
• Seeds 1–8 meet only in the quarterfinals or later.

Seed order for 8 and 16 teams

Reading the bracket from top to bottom, the first-round lines are:

You can build any size by doubling: take the previous order and replace each seed s with the pair “s v (size + 1 − s)”. The 16-team bracket page shows the full draw with match numbers.

When the numbers don’t fit: byes

Brackets work in powers of two — 4, 8, 16, 32, 64. With any other number, round up to the next power of two and fill the gaps with byes: a free pass into round 2.

• How many byes? Bracket size minus entrants. 12 teams → 16-slot bracket → 4 byes.
• Who gets them? The top seeds, in order. With 12 teams, seeds 1–4 skip round 1.
• Who plays in round 1? Everyone else: seeds 5–12 play 5 v 12, 6 v 11, 7 v 10 and 8 v 9.

Placing byes anywhere else creates odd results: a bye in the middle of the draw can hand a weak team a free path while two favourites knock each other out in round 1.

How to decide the seeds

In order of preference:

1. Results from this event — a pool stage or short round robin, then seed by finishing position. It’s the fairest because everyone earned their seed on the day.
2. Recent results — last season’s league table, club ladder, or rating (chess, table tennis and pickleball all have common rating systems).
3. Organizer judgement — fine for social events, as long as you’re open about it.
4. Random draw — when nothing above is available, or when you want it to feel like a lottery. Byes then go to whoever is drawn into the top seed positions.

A common middle ground is to seed only the top 2 or 4 and draw everyone else randomly. That keeps favourites apart without pretending you can rank the whole field.

Seeding a double elimination bracket

The upper bracket is seeded exactly like a single elimination bracket. The lower bracket isn’t seeded directly: it fills with upper-bracket losers. Good brackets cross the drop-ins — losers from the top half of the upper bracket land in the bottom half of the lower bracket — so two teams who just played don’t meet again straight away. The single vs. double elimination guide explains how the two brackets fit together.

Seeding after pools

When groups feed a bracket, avoid same-group rematches in the first knockout round. The usual pattern is “cross-seeding”: winner of Group A plays runner-up of Group B, winner of B plays runner-up of A. With four groups, a bracket ordered A1 v B2, C1 v D2, B1 v A2, D1 v C2 puts each group’s two qualifiers in opposite halves, so they can only meet again in the final. The generator’s groups + playoffs format keeps group-mates apart in the first knockout round automatically.

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