{
    "name": "Poultry Feed Conversion Calculator",
    "url": "https://calculators.geekmidst.com/calculators/poultry-feed-conversion-calculator",
    "markdown": "https://calculators.geekmidst.com/calculators/poultry-feed-conversion-calculator.md",
    "category": "Agriculture",
    "description": "Calculate a broiler flock’s feed conversion ratio, FCR on weight gain, livability and European Production Efficiency Factor from feed, birds and weights.",
    "summary": "Feed conversion ratio is the feed eaten per kilogram of live weight produced; lower is better. EPEF combines livability, weight, age and FCR into one flock score.",
    "also_called": [
        "Broiler FCR calculator",
        "EPEF calculator",
        "Feed conversion ratio 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": "feed",
            "label": "Total feed consumed",
            "type": "number",
            "default": "39168",
            "unit": "kg"
        },
        {
            "name": "placed",
            "label": "Birds placed",
            "type": "number",
            "default": "10000"
        },
        {
            "name": "alive",
            "label": "Birds at the end (sold or weighed)",
            "type": "number",
            "default": "9600"
        },
        {
            "name": "weight",
            "label": "Average live weight",
            "type": "number",
            "default": "2.4",
            "unit": "kg"
        },
        {
            "name": "chick_weight",
            "label": "Average weight at placement",
            "type": "number",
            "default": "0.04",
            "unit": "kg",
            "optional": true
        },
        {
            "name": "age",
            "label": "Age at the end",
            "type": "number",
            "default": "40",
            "unit": "days"
        }
    ],
    "outputs": [
        {
            "key": "fcr",
            "label": "Feed conversion ratio",
            "format": "number"
        },
        {
            "key": "fcr_gain",
            "label": "FCR on weight gain",
            "format": "number"
        },
        {
            "key": "livability",
            "label": "Livability",
            "format": "percent"
        },
        {
            "key": "epef",
            "label": "European Production Efficiency Factor",
            "format": "number"
        },
        {
            "key": "live_weight",
            "label": "Live weight produced",
            "format": "number"
        },
        {
            "key": "feed_per_bird",
            "label": "Feed per bird placed",
            "format": "number"
        },
        {
            "key": "daily_gain_g",
            "label": "Average daily gain",
            "format": "number"
        }
    ],
    "formula": {
        "text": "FCR = Feed ÷ (Birds at end × Average weight);  EPEF = Livability% × Weight (kg) × 100 ÷ (Age × FCR)",
        "variables": {
            "Feed": "all feed delivered minus feed left over, kg",
            "Livability": "birds at end ÷ birds placed × 100",
            "Age": "days from placement to the end"
        }
    },
    "worked_example": {
        "inputs": {
            "feed": "39168",
            "placed": "10000",
            "alive": "9600",
            "weight": "2.4",
            "chick_weight": "0.04",
            "age": "40"
        },
        "steps": [
            "Live weight = 9,600 × 2.4 = 23,040 kg; FCR = 39,168 ÷ 23,040 = 1.70.",
            "Livability = 9,600 ÷ 10,000 = 96%.",
            "EPEF = 96 × 2.4 × 100 ÷ (40 × 1.70) = 23,040 ÷ 68 = 338.8."
        ],
        "result": "The flock converted feed at 1.70 kg per kg of live weight, with 96% livability and an EPEF of about 339."
    },
    "interpretation": "Compare FCR only between flocks of similar age and weight, because FCR rises as birds grow. EPEF lets you compare flocks finished at different ages; your breed’s performance objectives give the targets.",
    "assumptions": [
        "Feed consumed excludes feed left in bins and tanks at the end.",
        "FCR uses live weight of the birds at the end, not of birds that died."
    ],
    "limitations": [
        "Mortality-adjusted FCR (adding the weight of dead birds) is not calculated."
    ],
    "rules": null,
    "faqs": [
        {
            "question": "Why are there two FCR figures?",
            "answer": "The usual FCR divides feed by live weight at the end. FCR on gain subtracts the chicks’ starting weight, which matters more for short cycles."
        },
        {
            "question": "What is a good EPEF?",
            "answer": "Higher is better. Targets depend on breed, climate and market weight, so compare with your own past flocks and your breed company’s objectives."
        }
    ],
    "sources": [],
    "related": [
        {
            "name": "Poultry Mortality Calculator",
            "url": "https://calculators.geekmidst.com/calculators/poultry-mortality-calculator"
        },
        {
            "name": "Livestock Feed Ration Calculator",
            "url": "https://calculators.geekmidst.com/calculators/livestock-feed-ration-calculator"
        },
        {
            "name": "Ratio Calculator",
            "url": "https://calculators.geekmidst.com/calculators/ratio-calculator"
        }
    ],
    "disclaimer": null,
    "publisher": "GM¹X CalcVerse"
}