{
    "name": "Darts Checkout Calculator",
    "url": "https://calculators.geekmidst.com/calculators/darts-checkout-calculator",
    "markdown": "https://calculators.geekmidst.com/calculators/darts-checkout-calculator.md",
    "category": "Everyday tools",
    "description": "Enter the score you have left to see whether it can be finished in one visit, the fewest darts needed and one double-out checkout route.",
    "summary": "In standard darts you must finish exactly on zero with a double or the bullseye. Every score from 2 to 170 can be checked out in three darts except seven “bogey” numbers.",
    "also_called": [
        "Darts checkout score calculator",
        "Darts out chart"
    ],
    "applies_to": "Worldwide",
    "last_updated": "2026-10-29",
    "computation": "Results are computed in the visitor’s browser on the HTML page. This API describes the calculator; it does not compute results.",
    "inputs": [
        {
            "name": "score",
            "label": "Score left",
            "type": "number",
            "default": "121"
        }
    ],
    "outputs": [
        {
            "key": "route",
            "label": "One checkout route",
            "format": "text"
        },
        {
            "key": "darts",
            "label": "Fewest darts",
            "format": "text"
        },
        {
            "key": "double",
            "label": "Finishing double",
            "format": "text"
        }
    ],
    "formula": {
        "text": "Search every combination of up to two set-up darts (S1–S20, 25, T1–T20, D1–D20, Bull) followed by a double (D1–D20 or Bull = 50) whose total equals the score; report the one with the fewest darts.",
        "variables": {
            "S, D, T": "single, double and treble of a segment",
            "25, Bull": "outer bull (25) and bullseye (50, which counts as a double)"
        }
    },
    "worked_example": {
        "inputs": {
            "score": "170"
        },
        "steps": [
            "No single dart or two darts can make 170 (the most two darts can score while finishing on a double is 110).",
            "Three darts: T20 (60) + T20 (60) = 120 leaves 50, the bullseye.",
            "60 + 60 + 50 = 170, finishing on the bull, which counts as a double."
        ],
        "result": "170, the “big fish”, is the highest checkout: T20, T20, Bull."
    },
    "interpretation": "The route shown is one valid finish chosen with common doubles (D20, D16, D8…) first. Players often choose a different set-up so that a missed dart still leaves a finish.",
    "assumptions": [
        "Double-out rules: the last dart must be a double or the bullseye, and the score must reach exactly zero."
    ],
    "limitations": [
        "It does not choose routes to protect against missed darts, and does not handle straight-out or double-in formats."
    ],
    "rules": null,
    "faqs": [
        {
            "question": "What are the bogey numbers?",
            "answer": "159, 162, 163, 165, 166, 168 and 169 cannot be finished with three darts, even though they are below 170."
        },
        {
            "question": "Can you finish on 1?",
            "answer": "No. Going to 1 is a bust because no double is worth 1."
        }
    ],
    "sources": [],
    "related": [
        {
            "name": "Golf Stableford Points Calculator",
            "url": "https://calculators.geekmidst.com/calculators/golf-stableford-points-calculator"
        },
        {
            "name": "Average Calculator",
            "url": "https://calculators.geekmidst.com/calculators/average-calculator"
        },
        {
            "name": "Percentage Calculator",
            "url": "https://calculators.geekmidst.com/calculators/percentage-calculator"
        }
    ],
    "disclaimer": null,
    "publisher": "GM¹X CalcVerse"
}