How to Run a Tournament with an Odd Number of Teams
You've got 5 teams confirmed. Or 7. Or 9. The bracket doesn't divide evenly, and you're wondering how to make it work. The good news: odd team counts are completely normal, and there are several clean solutions depending on how much time you have and what kind of experience you want.
Why odd numbers feel awkward
Tournament brackets are built on powers of 2 — 4, 8, 16, 32. When your team count doesn't match, someone has to sit out somewhere. In round-robin, you can't pair everyone in a round if the total is odd.
But this isn't a real problem. Every format has a standard way to handle it. Here are your options.
Option 1: Round-robin
Best for small odd numbers (5-9 teams)
Round-robin works perfectly with odd numbers. Every team plays every other team. The only difference from an even-numbered round-robin is that one team has a bye (a rest round) each round — and every team gets the same number of byes, so it's completely fair.
| Teams | Total matches | Rounds | Matches per round | Byes per round |
|---|---|---|---|---|
| 5 | 10 | 5 | 2 | 1 |
| 7 | 21 | 7 | 3 | 1 |
| 9 | 36 | 9 | 4 | 1 |
| 11 | 55 | 11 | 5 | 1 |
With 5 teams, you get 10 matches across 5 rounds — very manageable for a half-day event. With 7 teams, it's 21 matches across 7 rounds, which fits in a full day.
Why it works: No one is eliminated. Everyone plays the same number of matches (N-1). The standings tell you exactly who's best. For odd numbers under 10, this is usually the simplest and fairest option.
For a full breakdown, see our round-robin guide.
Option 2: Single elimination with byes
Best for quick events with any team count
In single elimination, odd numbers are handled with byes. The top-seeded teams skip the first round and enter the bracket later.
The formula: byes = next power of 2 - team count
| Teams | Byes | Round 1 matches | Total matches |
|---|---|---|---|
| 5 | 3 | 1 | 4 |
| 7 | 1 | 3 | 6 |
| 9 | 7 | 1 | 8 |
| 11 | 5 | 3 | 10 |
With 5 teams: 3 teams get a bye, only 2 teams play in round 1, and the bracket fills out from round 2. The top seeds earn their byes through seeding.
Why it works: It's fast. With 5 teams you only need 4 matches total. The trade-off is that some teams play fewer matches than others, and a single bad match can end your tournament.
For more on how brackets work, see our single elimination guide.
Option 3: Group stage + knockout
Best for larger odd numbers (11+ teams)
When you have 11 or more teams and an odd count, a group stage handles the imbalance naturally. You split teams into groups of different sizes, play round-robin within each group, and advance the top teams to a knockout bracket.
Example — 7 teams:
- Group A: 4 teams (6 matches)
- Group B: 3 teams (3 matches)
- Top 2 from each group advance to semifinals (3 knockout matches)
- Total: 12 matches
Example — 11 teams:
- Group A: 4 teams (6 matches)
- Group B: 4 teams (6 matches)
- Group C: 3 teams (3 matches)
- Top 2 from each group + 2 best third-place teams advance to quarterfinals (7 knockout matches)
- Total: 22 matches
Why it works: Groups absorb the uneven numbers. A group of 3 and a group of 4 work just fine side by side. Everyone gets multiple matches before any elimination happens.
Check out our multi-stage tournament guide for a full walkthrough.
Option 4: Swiss system
Works with any number
Swiss is designed to handle any team count. Each round, teams are paired against opponents with similar records. No one is eliminated. After a set number of rounds (usually 4-6), the team with the best record wins.
With an odd number, one team receives a bye each round (typically the lowest-ranked unpaired team), and that bye counts as a win.
Why it works: Swiss is format-agnostic about team count. It's especially good when you want competitive matches without the time commitment of a full round-robin. See our Swiss format guide.
Quick comparison for odd team counts
| Teams | Round-robin | Single elim | Groups + KO |
|---|---|---|---|
| 5 | 10 matches, 5 rounds | 4 matches, 3 rounds | Overkill — use RR |
| 7 | 21 matches, 7 rounds | 6 matches, 3 rounds | 12 matches (2 groups) |
| 9 | 36 matches, 9 rounds | 8 matches, 4 rounds | 18 matches (3 groups of 3) |
| 11 | 55 matches, 11 rounds | 10 matches, 4 rounds | 22 matches (3 groups) |
The short answer
- 5-9 teams: Round-robin is almost always the best choice. It's fair, simple, and finishes in a reasonable time.
- 7+ teams with limited time: Single elimination with byes gets it done fast.
- 11+ teams: Groups + knockout handles the uneven numbers naturally and gives everyone multiple matches.
- Any number, competitive field: Swiss works with everything.
No matter which format you pick, Score7 handles odd team counts automatically — byes are placed correctly, schedules are balanced, and standings account for rest rounds. Create your tournament and the math is taken care of.