How to Umpire a Badminton Match: Calls, Faults & Scoresheet

A badminton umpire has three jobs: keep the score right, make sure the correct player serves from the correct court, and apply the Laws consistently when something goes wrong. Most club matches have no umpire at all, which is exactly why scores, server and end-switch disputes start so often. This guide covers what an umpire says before and after every rally, how to track the server in singles and doubles, the faults and lets you will actually see, and how to keep a scoresheet.

It follows the BWF Laws of Badminton and standard BWF umpiring practice. Club and school matches often simplify some of this (self-umpiring, no service judge, no intervals), and where that is common we say so.

The umpire's role in brief

At an international match the umpire sits on a high chair beside the net and is supported by a service judge (who watches the serve) and line judges (who call the lines). At club level one person usually does everything, or the players officiate themselves.

The umpire's authority covers the whole match: calling faults and lets, announcing the score, controlling intervals and ending the game. At higher levels the umpire can overrule a line judge or service judge on a question of fact within their view. Anyone umpiring a club match can use the same principles: decide quickly, announce clearly, and be consistent from the first rally to the last.

Before the match

1. Toss. A coin or shuttle toss decides who chooses first. The winner can elect to serve or receive first, or to choose an end; the loser takes the remaining choice.
2. Check the equipment and court. Net height, shuttle speed and lines should be right before play. See our court dimensions guide for the measurements.
3. Record the starting positions. Note who serves first and who receives, and in doubles which player starts in which court.
4. Start play with the call "love all, play".

Calling the score after every rally

The server's score is always called first. After each rally, announce the new score so both players, the opponents and any spectators agree.

Situation	What the umpire calls
Start of a game	"Love all, play"
Serving side leads 7–5	"7–5" (server first)
Receiving side wins the rally and leads 8–7	"8–7" with the new server's score first
Scores level at 14	"14 all"
One point from the game	"Game point" then the score
One point from the match	"Match point" then the score
Game won	"Game, 21–17" and who won

At international level umpires also call "service over" when serve passes to the other side; at club level, the scoreboard change tells everyone the same thing.

The scoring rules you are enforcing

The scoring rules are covered in full in our badminton scoring rules explained guide. In short:

• A game is to 21 points, rally-point, and you must win by two clear points.
• At 29–29, the next point wins the game (a 30–29 finish).
• A match is the best of three games.
• The winner of a rally scores the point and serves next.

Tracking the server and the court

This is where most club umpiring errors happen, and it comes down to one rule: the serving side serves from the right court when its score is even (including 0) and from the left court when its score is odd.

Singles

Singles has one server, so the serving side's score decides everything. Serving at 4 → right court. Win the rally, now 5 → left court. Lose the rally and the opponent serves from the court that matches their score.

Doubles: a worked example

Side A is serving at 4–3. The score is even, so the server serves from the right court.

1. A wins the rally: 5–3. A keeps serving, but the score is now odd, so the same server serves from the left court. The server and partner have swapped courts.
2. A loses the next rally: it is 5–4 to B. B is now serving. B's score (4) is even, so B serves from the right court. Whoever is standing in B's right court serves, which is not necessarily the player who served last time.
3. B wins again: 5–5, B's score is odd, so B's server moves to the left court and the partner swaps over.

The pattern: the side that wins a rally serves next, and the score of the serving side decides the court. Players only swap courts after winning a rally while serving, so if a server and partner ever stand in the wrong courts, the score will show it immediately.

A server or receiver in the wrong court is treated specially under the Laws: broadly, an error caught before the next serve is replayed as a let, while one noticed later stands. The exact wording matters if a match depends on it, so check the current Laws of Badminton and your competition's rules.

Faults you will call most often

A fault gives the opponent the point (and the serve if they were receiving). The umpire or service judge calls "fault" for:

• Service faults. The shuttle is struck above the allowed height, the racket head is not below the hand, the server's feet move or touch a line, the shuttle lands outside the correct diagonal service court, or the server delays the serve.
• Shuttle in the net, or under it, or landing outside the boundary lines.
• Touching the net with the racket or body during the rally.
• Double hits — the shuttle struck twice in succession by one player, or by a player and their partner.

Lines are in-or-out, and a shuttle that lands on the line is in. At club level players normally call their own side's lines honestly, and a replay (a let) is a common convention when neither player can say for sure.

Lets: when to replay a rally

A let is a replayed rally, with no point and no change of server. Typical causes:

• The shuttle gets caught on the net after passing over (or sticks on top of it).
• An unforeseen disturbance such as a shuttle from another court landing on yours, or a clear external interruption.
• The receiver was not ready, and the receiver made no attempt to return.

Call "let", reset the score unchanged, and replay with the same server and court.

Intervals and ends

• Change ends after the first game, after the second game if there is a third, and in the deciding game when the leading side reaches 11. Tell players when it happens, and double-check the server and court afterwards.
• 60-second interval when the leading side reaches 11 in each game.
• 120-second interval between games.

The umpire calls "time" to restart play when an interval ends. In club leagues these are often shortened or skipped, so check your competition's rules.

Keeping a scoresheet

A paper scoresheet exists to prove what happened. The standard BWF form records both sides, the first server and receiver, and the running score, marking each rally as it is played. For a club match, a simple version is enough:

1. Header: players or pairs, date, court, and the toss result.
2. Starting positions: who serves first and who starts in each court.
3. Running score: after each rally, record the points won by each side, and mark who served.
4. Event notes: time of the 11-point interval, the ends switch in game three, any lets, faults or warnings.
5. Final result: game scores and the winner, signed or confirmed by both sides.

Doing it on paper while calling the score, tracking the server, and watching the lines is genuinely demanding, which is why many club umpires now use a scoring app.

Common umpiring mistakes to avoid

• Forgetting the ends switch at 11 in the third game. Make it the first thing you check each point from 9 onwards.
• Announcing the receiver's score first. The server's score always goes first.
• Letting the wrong player serve in doubles after a change of service. Check "whose turn is it" against the court the score demands.
• Cutting the 60- and 120-second intervals short when your competition uses them.
• Changing your mind on a call after the players react. Decide, announce, move on.

Let the app do the bookkeeping

Umpiring a league night or tournament match? Smash keeps the score, the server and the service court for you, flags the ends switch at 11 in a deciding game, and records every point so the result is on file when the final rally ends — which leaves you free to watch the shuttle and make the calls.

Running the whole event? Pair this with our guides to running a badminton tournament, a fair round-robin schedule and the americano format.