Darts Calculator — Score Tracker and Checkout Calculator
Free darts calculator for scoring and checkouts. Track dart scores, calculate darts checkout combinations, and find the best dart out route for any remaining score.
Enter each turn's 3-dart total (0–180). Reaching exactly 0 wins; going below 0 or to 1 is a bust and your turn is skipped.
About the Darts Scorer & Checkout Calculator
You're sitting on a finish — 121, 85, 170 — and you need to know the actual route to zero before it's your turn again, not five minutes from now. This scorer runs a real checkout search over every legal 1-, 2- and 3-dart route and hands you a sequence that ends on a double, exactly the way the rules require, instead of you doing mental arithmetic under pressure at the oche.
It's built for two kinds of moments: mid-leg, when you want to glance at a checkout instead of guessing at it, and off the board entirely, when you're memorizing the standard finishes players are expected to know cold — 170 (T20, T20, Bull), 121 (T20, 11, D25), and the rest of the classic 501/301 checkout chart.
Feed it any remaining score from 2 to 170 and it works out the same way a chalker would: search for a one-dart finish first, then two darts, then three, always landing the last dart on a double or the bullseye.
How it’s calculated
Darts' most important rule for checkouts: the finishing dart must land on a double (including the outer bull as D25, worth 50). A treble 20 followed by a treble 19 doesn't finish anything if the last dart isn't a double — no matter how much score it removes.
The calculator searches shortest-path-first. It checks whether your remaining score is itself a double (a 1-dart out, like 40 = D20); if not, it looks for any single dart plus a double that adds up to your score; if that fails too, it searches every combination of two darts plus a closing double. That mirrors how a real player should be thinking, just faster.
Not every score has a checkout in three darts. Nine scores between 2 and 170 — 169, 168, 166, 165, 163, 162, and 159 — are the well-known "bogey numbers": no combination of three darts lands on a double from those totals, so the standard advice is to bust that score down into something else on your next visit rather than aim straight at it.
Frequently asked questions
What is the highest possible checkout in darts?
170, known as the "big fish" — hit with treble 20, treble 20, then the bullseye (double 25). It's the highest finish achievable in three darts and one of the most celebrated shots in the sport.
Why can't I check out on 169?
169 is one of darts' nine "bogey numbers" (169, 168, 166, 165, 163, 162, 159) — there's no legal combination of three darts that reduces 169 to zero while finishing on a double. The standard play is to score down to a different, checkout-friendly number instead.
Does the last dart have to land on a double to win?
Yes — in standard 501 and 301, the leg only ends on a double (D1 through D20) or the bullseye counted as double 25. Any other finish, including a treble or the single bull, doesn't count and the remaining score carries over.
What happens if I score more than I have left — is that a bust?
Yes, that's a "bust." If a dart would take your remaining score below zero, to exactly 1, or to zero without the last dart being a double, the entire turn's score is voided and your total resets to what it was before that turn started.
What's a good checkout to memorize for 501?
The three every player learns first are 170 (T20, T20, Bull), 121 (T20, 11, D25 or T20, 15, D18 depending on preference), and 40 (D20) — that last one because so many legs end with a simple double-20 look.
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