How to score badminton: the 21-point game, explained

Badminton settled its great scoring argument in 2006, when the Badminton World Federation retired sideout scoring — the old system in which only the serving side could score — and adopted rally point scoring across the sport. Every rally ends in a point for somebody; there is no such thing as a wasted exchange. Win the rally and you win the point, whether you served or not.

Games are played to 21 points, and a match is the best of three games. That is the whole skeleton. The rest of this guide fills in the joints: how a game actually closes out, who serves from where, how doubles rotation works, what counts as a fault, and when everyone gets to towel off.

Twenty-one, by two, capped at thirty

A game goes to the first side to reach 21 points — with one condition. You must lead by two. At 20-all, the game continues until one side opens a two-point gap: 22-20, 25-23, and so on. There is no separate deuce vocabulary, no advantage scoring borrowed from tennis. The scoreboard alone tells you the state of the game.

The extension is not infinite. If the score reaches 29-all, the cap engages and the next point decides the game: first to 30, full stop. That golden point is rare enough that crowds at professional events audibly lean in when it arrives. A match is the best of three games — two settle most matches, and a third is played only when the sides split the first two.

Where you stand to serve

Service courts follow one rule, and it never varies: when the server's score is even — 0, 2, 4 — the serve comes from the right service court. When it is odd, the serve comes from the left. Every game starts at love-all, an even score, so the first serve of every game travels from the right court to the diagonally opposite box.

In singles this produces a tidy rhythm. Score a point while serving and you keep the serve, switching courts to match your new score. Lose the rally and the serve passes to your opponent, who serves from whichever court their own score dictates. If you ever forget which side you should be standing on, your score remembers for you: even right, odd left.

Doubles rotation, demystified

Doubles service confuses more newcomers than any other law in the book, mostly because older players remember the abandoned "second serve" era. The current rule is leaner: each side gets exactly one serve. When the serving pair loses a rally, the serve passes straight to the opponents — there is no backup server waiting behind the first.

The swap rule is the part to memorize. Partners exchange service courts only when their side wins a point while serving; the same server then serves again from the other box. When the receiving side wins a rally, nobody on either pair changes courts — the new serving side simply serves from wherever its score dictates, even from the right, odd from the left, delivered by the player already standing there.

If a doubles court ever looks scrambled, reconstruct it from the score. Each player's position traces back to where they stood at love-all and how many points their side has scored while serving.

Faults, lets, and the 1.15-meter line

The serve attracts the most faults. For decades the law required contact below the server's waist, defined as the lowest rib. BWF has since replaced that moving target with a fixed one: the entire shuttle must be below 1.15 meters from the court surface at the instant it is struck, judged at sanctioned events by a measuring device at the service judge's chair. Club play in the US still mostly runs on the waist convention, but the written law is now the fixed height.

During the rally, the shuttle may be struck only once per side. A double hit by one player — or one hit each by doubles partners — is a fault, as is a carry, where the shuttle is momentarily caught and slung rather than hit. Touching the net with racket, body, or clothing while the shuttle is in play is also a fault.

A let replays the rally with no point scored: the receiver was not ready, the shuttle lodged on top of the net after crossing during a rally, or some genuine accident interrupted play. A shuttle caught in the net on the serve, though, is a fault, not a let.

Ends, intervals, and the rhythm of a match

Players change ends after the first game and again after the second if the match goes to a third. In the deciding game, ends change once more when the leading side reaches 11 points, so neither side plays the entire decider against the same drift and lighting.

The breaks are written into the laws too. When the leading score reaches 11 in any game, play pauses for up to 60 seconds — coaches step in, water bottles come out. Between games, the interval stretches to 120 seconds. Neither is optional rest the players negotiate; both belong to the official rhythm of the match.

All of this is easier to apply than to recite, and easier still when the bookkeeping is automated. HmBr's scoring app records matches point by point — server, service court, intervals and all — so the laws run quietly in the background while you play.