{
    "name": "Asphalt Road Tonnage Calculator",
    "url": "https://calculators.geekmidst.com/calculators/asphalt-road-tonnage-calculator",
    "markdown": "https://calculators.geekmidst.com/calculators/asphalt-road-tonnage-calculator.md",
    "category": "Construction",
    "description": "Work out asphalt tonnage from paved length, width, compacted thickness and mix density, in metric tonnes and US short tons, plus volume and area.",
    "summary": "Asphalt is ordered by weight: area × compacted thickness gives volume, and volume × compacted density gives tonnes.",
    "also_called": [
        "Blacktop calculator",
        "Tarmac 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": "units",
            "label": "Units",
            "type": "segmented",
            "default": "metric",
            "options": {
                "metric": "Metric",
                "imperial": "Imperial"
            }
        },
        {
            "name": "length",
            "label": "Length",
            "type": "number",
            "default": "100"
        },
        {
            "name": "width",
            "label": "Width",
            "type": "number",
            "default": "7"
        },
        {
            "name": "thickness",
            "label": "Compacted thickness",
            "type": "number",
            "default": "50"
        },
        {
            "name": "density",
            "label": "Compacted density",
            "type": "number",
            "default": "2400",
            "unit": "kg/m³"
        },
        {
            "name": "waste",
            "label": "Waste allowance",
            "type": "number",
            "default": "5",
            "unit": "%",
            "optional": true
        }
    ],
    "outputs": [
        {
            "key": "tonnes",
            "label": "Asphalt to order",
            "format": "number"
        },
        {
            "key": "short_tons",
            "label": "Asphalt to order",
            "format": "number"
        },
        {
            "key": "volume_m3",
            "label": "Compacted volume (no waste)",
            "format": "number"
        },
        {
            "key": "area_m2",
            "label": "Paved area",
            "format": "number"
        },
        {
            "key": "area_yd2",
            "label": "Paved area",
            "format": "number"
        }
    ],
    "formula": {
        "text": "Tonnes = L × W × t × ρ × (1 + Waste) ÷ 1000",
        "variables": {
            "L, W": "paved length and width",
            "t": "compacted layer thickness",
            "ρ": "compacted density in kg/m³"
        }
    },
    "worked_example": {
        "inputs": {
            "units": "metric",
            "length": "100",
            "width": "7",
            "thickness": "50",
            "density": "2400",
            "waste": "5"
        },
        "steps": [
            "Volume = 100 × 7 × 0.05 = 35 m³.",
            "Mass = 35 × 2400 = 84,000 kg = 84 t.",
            "With 5% waste: 84 × 1.05 = 88.2 t (97.22 US tons)."
        ],
        "result": "A 100 m × 7 m road with a 50 mm course needs about 88.2 tonnes of asphalt including 5% waste."
    },
    "interpretation": "Calculate each course (base, binder, surface) separately because their thickness and density differ. Loose material is laid thicker than its compacted thickness.",
    "assumptions": [
        "Uniform compacted thickness over a rectangular area."
    ],
    "limitations": [
        "Tack coat, kerbs and patching are not included."
    ],
    "rules": null,
    "faqs": [
        {
            "question": "What is a typical asphalt density?",
            "answer": "Dense-graded hot-mix asphalt is commonly around 2.3–2.4 t/m³ when compacted, but each mix design states its own value."
        },
        {
            "question": "Metric tonne or US ton?",
            "answer": "A metric tonne is 1000 kg; a US short ton is 2000 lb (907.2 kg). Both are shown."
        }
    ],
    "sources": [],
    "related": [
        {
            "name": "Paver Block Quantity Calculator",
            "url": "https://calculators.geekmidst.com/calculators/paver-block-quantity-calculator"
        },
        {
            "name": "Excavation Earthwork Calculator",
            "url": "https://calculators.geekmidst.com/calculators/excavation-earthwork-calculator"
        },
        {
            "name": "Concrete Calculator",
            "url": "https://calculators.geekmidst.com/calculators/concrete-calculator"
        }
    ],
    "disclaimer": "Quantities are estimates. Confirm requirements with your engineer or supplier before ordering materials.",
    "publisher": "GM¹X CalcVerse"
}