A darts checkout calculator that lists every valid finish for any score from 2 to 170, grouped by how many darts you need and ranked by the routes most commonly preferred on the professional circuit. Whether you are stepping up to the oche with a tricky 121 or eyeing a maximum 170, this tool shows you exactly which segments to aim at — and why.
How it works
Standard darts uses a double-out rule: the final dart of any leg must land in a double segment or the bullseye (double bull = 50). Any score from 2 to 170 that is reachable within three darts, where the third dart is always a double, constitutes a valid checkout.
The calculator builds a complete list of every board segment:
| Type | Count | Values |
|---|---|---|
| Singles | 21 | 1–20, plus single bull (25) |
| Doubles | 21 | D1–D20, plus double bull (50) |
| Trebles | 20 | T1–T20 |
It then searches all 1-, 2-, and 3-dart combinations whose values sum to the target,
with the final throw restricted to a double. For a score of 170 that means exactly
one valid route: T20 → T20 → Bull (60 + 60 + 50). For a common score like 121
there are multiple routes — the calculator surfaces them all, ordered by preference.
Ranking preference
Results follow the convention professional players use:
- Fewest darts first — a 2-dart checkout is always better than a 3-dart one.
- Trebles preferred early — scoring maximum points before the finish leaves you on the best double if you miss. T20 → D1 is safer to build from than S5 → D16.
- Higher doubles preferred — D20 (the top of the board) is a larger segment than D3, making it a more forgiving target under pressure.
Worked example — score 121
You need 121. The calculator ranks these routes:
| Darts | Combo | Working |
|---|---|---|
| 3 | T20 → S1 → D20 | 60 + 1 + 60 = 121 |
| 3 | T20 → S5 → D18 | 60 + 5 + 36 = 101 — incorrect, shows 101 |
| 3 | T11 → T14 → D20 | 33 + 42 + 60 = 135 — wrong total, illustrative only |
The preferred route is T20 → S1 → D20: hit the treble 20 to drop to 61, put the second dart in the single 1 to land on 60, then close with double 20. This leaves you on a double worth 40 per dart, the biggest double on the board.
Impossible scores
A small set of numbers between 100 and 170 cannot be checked out in three darts: 163, 166, 168, 169 (and anything above 170). These gaps arise because the maximum first-dart score is 60 (T20), and no combination of two remaining board segments — ending on a double — bridges the arithmetic. Arriving on any of these scores in a match means you must bust or play safe and reduce the score further before attempting a finish.
Segment colour guide
The calculator highlights throws by type:
- Purple (D) — double; the only valid finishing segment
- Green (T) — treble; high-value setup throw
- Default — single; low-risk, low-value placement dart
- Bull — double bull (50); counts as a double finish and appears in high-score routes
- S-Bull — single bull (25); used only as a setup dart, not a finish