How to use it
- Type the Score remaining in the leg, from 2 to 170.
- Read the Preferred checkout, the route to try first.
- Open All checkouts to see every route, with the fewest darts first.
- If Checkout possible? shows a bogey number, play a dart that leaves a score you can finish.
Segments and finishes
A single segment scores its number from 1 to 20 (S20 is the single 20). The double ring scores twice the number (D20 is 40) and the treble ring three times (T20 is 60). The outer bull (SB) scores 25 and the inner bull (DB) scores 50.
A leg is won by reaching exactly zero, with the final dart landing in the bullseye or a double segment. A turn has three darts, and on the last turn the game can finish on any of them. The Darts article gives the highest finish with three darts as 170: T20, T20, inner bull.
Darts used: 1, 2 or 3
Finishing dart: a double (D1 to D20, 2 to 40) or the inner bull (DB, 50)
Sum of the darts = score remainingBogey numbers and the order
A bogey number is a score that no route of up to three darts can finish. The two pages the tool follows do not list them, so the tool works them out from the scoring rules above. The list from 2 to 170 is 159, 162, 163, 165, 166, 168 and 169.
The order of the routes is the tool's own: fewer darts first, then the highest first dart. The Darts article shows finishes as examples, for instance 138 by T20, T18, D12 or by T19, T19, D12, but it does not rank them.
What the calculator does not cover
- The darts thrown already in the turn, and the busts that a missed dart causes. The tool lists the routes from the score only.
- Routes that finish on the outer bull (25): the tool counts the inner bull as the double bull, and does not finish on the outer one.
- The checkout a particular player prefers. Players and checkout charts differ.
Worked example: 170, 169 and 100
170 has one route: T20 (60), T20 (60) and the inner bull (50), which add to 170 with the last dart on the bull.
169 is a bogey number. With the inner bull the other two darts must make 119, and no two segments do. 100 has two-dart routes: T20 then D20 (60 + 40), and the inner bull twice (50 + 50). The tool puts T20, D20 first.
| Score | Preferred checkout | Result |
|---|---|---|
| 170 | T20, T20, DB | one route |
| 169 | — | bogey number, no checkout |
| 100 | T20, D20 | two-dart routes: T20, D20 and DB, DB |
Frequently asked questions
What is a bogey number?
A bogey number is a score that no three darts can finish on a double or the bull. For 169 the inner bull leaves 119 for the other two darts, and no two segments add up to 119.
Why does the last dart have to land on a double?
The Darts article says a leg is won by reaching exactly zero with the final dart in the bullseye or a double segment. The glossary calls the inner circle the double bull, worth 50, so this tool counts it as a finish.
Why is 170 the highest checkout?
With three darts the highest total is 60 + 60 + 50 = 170: treble 20, treble 20 and the inner bull. The Darts article and the glossary both give 170 as the highest finish with three darts.
Which checkout do professional players choose?
The pages the tool follows do not rank the checkouts by what players choose. The order shown is the tool's own: fewest darts, then the highest first dart.
Does the calculator take the darts already thrown into account?
No. It lists the routes that take the score you type to exactly zero. It does not follow the darts thrown in the turn, so a missed dart is not part of any route.
How many darts does a checkout use?
One, two or three. A finish can come on the first, second or third dart, so the table lists the one-dart routes first, then the two-dart and the three-dart routes.
Sources
- Wikipedia: Darts, scoring and finishing a leg
- Wikipedia: Glossary of darts, inner bull and highest checkout
Figures and text last checked on Tuesday, November 10, 2026.