Darts Sets & Legs Explained: How the Competitive Format Works
You're watching a professional darts match and hear terms like 'set', 'leg' and 'best-of-7'. What exactly do these mean? And how do you apply this format in a casual game at home? This guide explains it step by step.
What is a leg?
A leg is the smallest unit of a darts match. Each player starts at 501 points and alternates turns of three darts. Scores are subtracted until someone reaches exactly zero — with the final dart on a double or bullseye.
The player who reaches zero first wins the leg. A leg typically lasts 15–25 minutes for two average players. At higher levels (average > 90) a leg can be played in as few as 9 to 12 darts.
Shortest possible leg
The shortest theoretically possible 501 leg takes 9 darts: T20 + T20 + T20 = 180, T20 + T20 + T20 = 180, T20 + T19 + D12 = 141. Total = 501. This 'nine-darter' is the holy grail of darts.
What is a set?
A set groups multiple legs together. You win a set by winning a predetermined number of legs. The most common format is best-of-5 legs per set: the first player to win 3 legs wins the set.
A match then consists of multiple sets. The player who wins the predetermined number of sets wins the match. This layered system (legs within sets, sets within a match) creates exciting comebacks and longer, competitive formats.
Best-of formats explained
'Best-of' indicates the maximum number of legs or sets to be played. Best-of-5 means: up to 5 played, winner has won 3. Best-of-7 means: up to 7 played, winner has won 4.
| Format | Max. games | Wins at |
|---|---|---|
| Best-of-3 | 3 | 2 |
| Best-of-5 | 5 | 3 |
| Best-of-7 | 7 | 4 |
| Best-of-9 | 9 | 5 |
| Best-of-13 | 13 | 7 |
Example: how a match unfolds
Suppose: a match is best-of-5 sets, with best-of-5 legs per set. Player A wins the first set 3–2 (three legs to two). Player B wins the second set 3–1. Player A wins the third set 3–0. Score: A 2–1. They continue until someone has 3 sets.
Score overview (example)
Player A wins the match 3–1 in sets.
Why does professional darts use sets?
Sets were introduced to create longer, more dramatic matches. Without sets, one good run of darts could decide an entire match. With sets, players need to perform consistently across multiple legs and sets — reducing the effect of a single lucky run.
For casual players, a set format is optional. ScoreApp supports both single legs (casual) and full sets & legs formats (competitive). You choose the format when starting a new game.
Sets & legs in ScoreApp
ScoreApp fully supports sets and legs for darts 501. When creating a new game, you choose:
- ✓Number of legs to win per set (e.g. 3 for best-of-5)
- ✓Number of sets to win (e.g. 3 for best-of-5 sets)
- ✓Whether to use sets or play legs only
The running score per set and leg is tracked live. After the match, your statistics (average, 180s, best leg) are automatically saved in the progress tracker.
Frequently asked questions
What is a leg in darts?
A leg is one complete game of 501 (or 301). Each player starts at 501 and takes turns throwing until someone reaches exactly zero via a double. The first player to reach zero wins the leg.
What is a set in darts?
A set is a collection of legs. You win a set by winning a predetermined number of legs — typically best-of-5 legs (first to 3 legs wins the set). Professional matches consist of multiple sets.
How many sets do professional darts players play?
It varies by tournament and round. In early rounds of the PDC World Championship players play best-of-5 sets. In the final this can increase to best-of-13 sets (first to 7 sets wins the title).
Does ScoreApp support sets and legs?
Yes. ScoreApp provides full sets and legs support for darts 501. You can configure the number of legs per set and the total number of sets before starting a game.
Written by ScoreApp
Last updated March 9, 2026