{
    "name": "Basketball Effective Field Goal Percentage Calculator",
    "url": "https://calculators.geekmidst.com/calculators/basketball-effective-field-goal-percentage-calculator",
    "markdown": "https://calculators.geekmidst.com/calculators/basketball-effective-field-goal-percentage-calculator.md",
    "category": "Everyday tools",
    "description": "Calculate basketball effective field goal percentage (eFG%), plain FG% and true shooting percentage (TS%) from makes and attempts.",
    "summary": "Effective field goal percentage gives a three-pointer 1.5 times the weight of a two: eFG% = (FG + 0.5 × 3P) ÷ FGA. Add free throws to get true shooting percentage.",
    "also_called": [
        "eFG% calculator",
        "True shooting calculator"
    ],
    "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": "fgm",
            "label": "Field goals made (FG, incl. threes)",
            "type": "number",
            "default": "8"
        },
        {
            "name": "tpm",
            "label": "Three-pointers made (3P)",
            "type": "number",
            "default": "3"
        },
        {
            "name": "fga",
            "label": "Field goal attempts (FGA)",
            "type": "number",
            "default": "15"
        },
        {
            "name": "ftm",
            "label": "Free throws made (FT)",
            "type": "number",
            "default": "4",
            "optional": true
        },
        {
            "name": "fta",
            "label": "Free throw attempts (FTA)",
            "type": "number",
            "default": "5",
            "optional": true
        }
    ],
    "outputs": [
        {
            "key": "efg",
            "label": "Effective field goal percentage (eFG%)",
            "format": "percent"
        },
        {
            "key": "fg_pct",
            "label": "Field goal percentage (FG%)",
            "format": "percent"
        },
        {
            "key": "ts_pct",
            "label": "True shooting percentage (TS%)",
            "format": "percent"
        },
        {
            "key": "points",
            "label": "Points",
            "format": "integer"
        }
    ],
    "formula": {
        "text": "eFG% = (FG + 0.5 × 3P) ÷ FGA;  PTS = 2 × FG + 3P + FT;  TS% = PTS ÷ (2 × (FGA + 0.44 × FTA))",
        "variables": {
            "FG": "all field goals made, twos and threes",
            "3P": "three-pointers made",
            "0.44": "the standard estimate of free-throw trips that use a possession"
        }
    },
    "worked_example": {
        "inputs": {
            "fgm": "8",
            "tpm": "3",
            "fga": "15",
            "ftm": "4",
            "fta": "5"
        },
        "steps": [
            "eFG% = (8 + 0.5 × 3) ÷ 15 = 9.5 ÷ 15 = 63.33%.",
            "Points = 2 × 8 + 3 + 4 = 23.",
            "TS% = 23 ÷ (2 × (15 + 0.44 × 5)) = 23 ÷ 34.4 = 66.86%."
        ],
        "result": "Going 8 for 15 with three threes is a 53.3% FG%, but a 63.3% eFG%; adding 4 of 5 free throws gives a 66.9% TS%."
    },
    "interpretation": "eFG% is one of Dean Oliver’s “four factors” and rewards efficient three-point shooting. TS% goes further by including free throws, so it is the better single measure of scoring efficiency.",
    "assumptions": [
        "Formulas as defined in the Basketball-Reference glossary."
    ],
    "limitations": [
        "Small samples (a single game) swing these percentages a lot."
    ],
    "rules": null,
    "faqs": [
        {
            "question": "Why does a three count as 1.5 field goals?",
            "answer": "A made three is worth 3 points against 2 for a two, so it is worth 1.5 made twos."
        },
        {
            "question": "Why 0.44 in true shooting?",
            "answer": "Not every free throw uses a possession (and-ones, three-shot fouls, technicals). 0.44 is the standard estimate of possessions per free-throw attempt."
        }
    ],
    "sources": [
        {
            "title": "Glossary (Basketball-Reference)",
            "url": "https://www.basketball-reference.com/about/glossary.html"
        }
    ],
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            "url": "https://calculators.geekmidst.com/calculators/baseball-batting-average-calculator"
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    ],
    "disclaimer": null,
    "publisher": "GM¹X CalcVerse"
}