Badminton Score Keeper

A badminton score keeper that knows the serving rules

This badminton score keeper turns a phone into a courtside scoreboard. Tap the side that won the rally and the tool adds the point, tells you who serves and from which court, spots deuce, applies the 30-point cap, and reminds you to change ends and take the interval. Singles and doubles are both covered.

It is meant for the matches that happen on a club night, in a school hall or on a society court with no umpire: the argument about “whose serve is it?” is settled by the screen. Every rally is stored in your browser, so a closed tab or a low battery does not lose the match.

How to use the Badminton Score Keeper

1. Open Match setup: choose the scoring (21-point games or the 15-point system), singles or doubles, one game or best of three, and who serves first. Type the player names.
2. Tap the big pad of the side that won the rally. The pad with the highlighted border is serving; it shows the server’s name and “right court” or “left court”. Doubles also shows the receiver.
3. Watch the message line: it announces the 60-second interval, the change of ends in the deciding game and the 120-second break between games.
4. Use Undo after a mis-tap. The scoreboard is replayed from the rally log, so serve, court and game score all rewind together.
5. At the end press “Copy result” for a WhatsApp-ready summary, or “Save JSON” to reload the match later.

Badminton Score Keeper features

The rules this scoreboard follows

The scoring and serving logic follows the BWF Laws of Badminton, as published at worldbadminton.com/laws (checked 30 October 2026). The 2025 Laws apply until 3 January 2027; the amendments for the 3×15 system were adopted by the BWF on 25 April 2026 and take effect on 4 January 2027.

• Rally scoring (Law 7): every rally scores for the winner, whoever served. A game goes to the side that first reaches 21; at 20-all the side that gains a two-point lead wins; at 29-all the side that scores the 30th point wins.
• 3×15 (from 4 Jan 2027): games to 15, a two-point lead at 14-all, and a cap at 21 (the 21st point wins at 20-all). In the deciding game players change ends when a side first reaches 8, with the mid-game interval at 8.
• Change of ends (Law 8): after the first and second games, and in the third game when a side first scores 11.
• Service court (Laws 9 and 10): right court when the server’s side has an even score, left when odd. The server and receiver stand in diagonally opposite courts.
• Doubles positions: players change courts only after winning a rally while their side is serving. When the receiving side wins, nobody moves; the player standing in the court that matches the new score serves.
• Intervals (Law 16.2): up to 60 seconds when the leading score reaches 11 and up to 120 seconds between games.
• The winner of a game serves first in the next game.

Limits

This tool does not know about faults, lets or umpire decisions: you tell it who won each rally. Doubles start with the first-named player of each side in the right court at the start of every game; if your pair swaps at the start of a game, enter the names in that order. Handicap and “alternative laws” formats are not modelled. Confirm event-specific rules with your tournament organiser.