{
    "name": "Knitting Machine Fabric Output Calculator",
    "url": "https://calculators.geekmidst.com/calculators/knitting-machine-fabric-output-calculator",
    "markdown": "https://calculators.geekmidst.com/calculators/knitting-machine-fabric-output-calculator.md",
    "category": "Textile & apparel",
    "description": "Calculate circular knitting machine output in kg per hour and per shift from RPM, feeders, needles, stitch length, yarn count and efficiency.",
    "summary": "Each revolution, every feeder knits one course on every needle. Yarn length per minute is RPM × feeders × needles × stitch length, and its weight follows from the yarn count.",
    "also_called": [
        "Circular knitting production 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": "rpm",
            "label": "Machine speed",
            "type": "number",
            "default": "25",
            "unit": "RPM"
        },
        {
            "name": "feeders",
            "label": "Feeders",
            "type": "number",
            "default": "90"
        },
        {
            "name": "needles",
            "label": "Needles",
            "type": "number",
            "default": "2640"
        },
        {
            "name": "stitch_length",
            "label": "Stitch length",
            "type": "number",
            "default": "2.8",
            "unit": "mm"
        },
        {
            "name": "count",
            "label": "Yarn count",
            "type": "number",
            "default": "20"
        },
        {
            "name": "count_system",
            "label": "Count system",
            "type": "select",
            "default": "tex",
            "options": {
                "tex": "Tex",
                "ne": "Ne (English cotton count)",
                "denier": "Denier",
                "nm": "Nm (metric count)"
            }
        },
        {
            "name": "efficiency",
            "label": "Machine efficiency",
            "type": "number",
            "default": "85",
            "unit": "%"
        },
        {
            "name": "hours",
            "label": "Running hours",
            "type": "number",
            "default": "24",
            "unit": "h"
        }
    ],
    "outputs": [
        {
            "key": "kg_per_hour",
            "label": "Production per hour",
            "format": "number"
        },
        {
            "key": "kg_total",
            "label": "Production for the hours entered",
            "format": "number"
        },
        {
            "key": "kg_per_hour_100",
            "label": "Production at 100% efficiency",
            "format": "number"
        },
        {
            "key": "yarn_m_per_min",
            "label": "Yarn consumed per minute",
            "format": "number"
        },
        {
            "key": "tex",
            "label": "Yarn count in tex",
            "format": "decimal4"
        }
    ],
    "formula": {
        "text": "Yarn m/min = RPM × Feeders × Needles × SL(mm) ÷ 1,000;  kg/h = Yarn m/min × 60 × tex ÷ 1,000,000 × Efficiency",
        "variables": {
            "SL": "stitch (loop) length in mm",
            "tex": "grams per 1,000 m; tex = 590.54 ÷ Ne = denier ÷ 9 = 1,000 ÷ Nm"
        }
    },
    "worked_example": {
        "inputs": {
            "rpm": "25",
            "feeders": "90",
            "needles": "2640",
            "stitch_length": "2.8",
            "count": "20",
            "count_system": "tex",
            "efficiency": "85",
            "hours": "24"
        },
        "steps": [
            "Yarn per minute = 25 × 90 × 2,640 × 2.8 mm = 16,632 m.",
            "At 20 tex: 16,632 × 60 × 20 ÷ 1,000,000 = 19.958 kg/h.",
            "At 85%: 16.96 kg/h; over 24 h: 407.15 kg."
        ],
        "result": "A 30″ 28G machine with 90 feeders at 25 RPM, 2.8 mm stitch length and 20 tex yarn makes about 17 kg an hour, 407 kg a day."
    },
    "interpretation": "Compare the result with actual roll weights. A consistent gap usually means the real efficiency or stitch length differs from the figure used.",
    "assumptions": [
        "Every feeder is active and knits on every needle (single jersey). For rib or interlock with two needle beds, enter the total needles that knit per feeder."
    ],
    "limitations": [
        "Spandex or plated yarns need each yarn calculated separately and added.",
        "Does not include yarn waste or moisture regain."
    ],
    "rules": null,
    "faqs": [
        {
            "question": "How do I convert Ne to tex?",
            "answer": "tex = 590.54 ÷ Ne, because Ne counts 840-yard hanks per pound."
        },
        {
            "question": "Where do I get the stitch length?",
            "answer": "Measure the yarn length in 100 needles of unravelled fabric, or use the setting from your knitting programme."
        }
    ],
    "sources": [],
    "related": [
        {
            "name": "Textile Machine OEE Calculator",
            "url": "https://calculators.geekmidst.com/calculators/textile-machine-oee-calculator"
        },
        {
            "name": "Fabric Price per Kilogram Calculator",
            "url": "https://calculators.geekmidst.com/calculators/fabric-price-per-kilogram-calculator"
        },
        {
            "name": "Fabric Lot Quantity Calculator",
            "url": "https://calculators.geekmidst.com/calculators/fabric-lot-quantity-calculator"
        }
    ],
    "disclaimer": null,
    "publisher": "GM¹X CalcVerse"
}