{"success":true,"version":"v1","request":{"tool":"get_calculator_schema","calculator_id":"asphalt-tonnage"},"result":{"entity_type":"calculator","id":"asphalt-tonnage","calculator_id":"asphalt-tonnage","canonical_url":"https://tttkmbb.com/construction/asphalt-tonnage","name":"Asphalt Tonnage Calculator","title":"Asphalt Tonnage Calculator – Hot-Mix Asphalt Weight in Tons and Tonnes from Area, Thickness and Density","category":"construction","category_name":"Construction & Home","tool_name":"estimate_asphalt_tonnage","featured_mcp_tool":false,"description":"Converts a paved area and compacted thickness into asphalt volume and weight with the compacted density of hot-mix asphalt (default 145 lb/ft³ ≈ 2,322 kg/m³), reported in pounds, kilograms, US short tons and metric tonnes with a waste allowance. Planning estimate only.","use_when":"You need to order hot-mix asphalt by the ton for a driveway, parking area or path of known area and compacted thickness.","do_not_use_when":"The pavement is concrete (use concrete-slab) or you need the aggregate base under it (use gravel); the exact density of a specific mix comes from the supplier's job-mix formula.","inputs":[{"name":"area","label":"Area","type":"number","unit":"ft² or m²","required":true,"max":10000000,"exclusive_min":0,"description":"Area to pave in ft² or m² (see area_unit).","example":1000},{"name":"area_unit","label":"Area unit","type":"enum","required":false,"default":"ft2","values":[{"value":"m2","label":"Square metres (m²)","aliases":["m²","sqm","square metres","square meters","metric"]},{"value":"ft2","label":"Square feet (ft²)","aliases":["ft²","sqft","square feet","imperial"]}],"description":"Unit of the area input; areas are reported in both m² and ft².","example":"ft2"},{"name":"thickness","label":"Compacted thickness","type":"number","unit":"in or mm","required":true,"max":1000,"exclusive_min":0,"description":"Compacted lift thickness in inches or millimetres (see thickness_unit): 2–3 in (50–75 mm) for driveways, 4 in (100 mm) or more for roads and parking lots.","example":3},{"name":"thickness_unit","label":"Thickness unit","type":"enum","required":false,"default":"in","values":[{"value":"in","label":"Inches","aliases":["inch","inches"]},{"value":"mm","label":"Millimetres","aliases":["millimetre","millimeter","millimetres","millimeters"]}],"description":"Unit of thickness.","example":"in"},{"name":"density","label":"Compacted density","type":"number","required":false,"max":5000,"exclusive_min":0,"description":"Compacted density of the mix in lb/ft³ or kg/m³ (see density_unit). Default 145 lb/ft³ (2,322 kg/m³), the usual estimating figure for dense-graded hot-mix asphalt.","example":145},{"name":"density_unit","label":"Density unit","type":"enum","required":false,"default":"lb_ft3","values":[{"value":"lb_ft3","label":"lb/ft³","aliases":["lb/ft3","pcf"]},{"value":"kg_m3","label":"kg/m³","aliases":["kg/m3"]}],"description":"Unit of density.","example":"lb_ft3"},{"name":"waste_percent","label":"Waste allowance","type":"number","unit":"%","required":false,"default":5,"min":0,"max":50,"description":"Extra material for cuts, breakage and offcuts, applied as a multiplier (1 + waste_percent/100). 5 % covers an uneven base, hand work at edges and material left in the truck.","example":5}],"outputs":[{"name":"volume_ft3","label":"Compacted volume","type":"number","unit":"ft³","decimals":2,"description":"area × thickness."},{"name":"volume_m3","label":"Compacted volume","type":"number","unit":"m³","decimals":3,"description":"Same volume in cubic metres."},{"name":"weight_lb","label":"Weight","type":"number","unit":"lb","decimals":0,"description":"volume × density."},{"name":"weight_kg","label":"Weight","type":"number","unit":"kg","decimals":0,"description":"Weight in kilograms."},{"name":"tons_us","label":"US short tons","type":"number","unit":"short tons","decimals":3,"description":"weight_lb / 2000."},{"name":"tonnes_metric","label":"Metric tonnes","type":"number","unit":"t","decimals":3,"description":"weight_kg / 1000."},{"name":"with_waste_tons_us","label":"Order (short tons)","type":"number","unit":"short tons","decimals":3,"description":"tons_us × (1 + waste_percent/100)."},{"name":"with_waste_tonnes","label":"Order (tonnes)","type":"number","unit":"t","decimals":3,"description":"tonnes_metric × (1 + waste_percent/100)."}],"input_schema":{"type":"object","properties":{"area":{"description":"Area to pave in ft² or m² (see area_unit). Unit: ft² or m².","type":"number","maximum":10000000,"exclusiveMinimum":0,"examples":[1000],"x-unit":"ft² or m²"},"area_unit":{"description":"Unit of the area input; areas are reported in both m² and ft².","type":"string","enum":["m2","ft2"],"default":"ft2","examples":["ft2"]},"thickness":{"description":"Compacted lift thickness in inches or millimetres (see thickness_unit): 2–3 in (50–75 mm) for driveways, 4 in (100 mm) or more for roads and parking lots. Unit: in or mm.","type":"number","maximum":1000,"exclusiveMinimum":0,"examples":[3],"x-unit":"in or mm"},"thickness_unit":{"description":"Unit of thickness.","type":"string","enum":["in","mm"],"default":"in","examples":["in"]},"density":{"description":"Compacted density of the mix in lb/ft³ or kg/m³ (see density_unit). Default 145 lb/ft³ (2,322 kg/m³), the usual estimating figure for dense-graded hot-mix asphalt.","type":"number","maximum":5000,"exclusiveMinimum":0,"examples":[145]},"density_unit":{"description":"Unit of density.","type":"string","enum":["lb_ft3","kg_m3"],"default":"lb_ft3","examples":["lb_ft3"]},"waste_percent":{"description":"Extra material for cuts, breakage and offcuts, applied as a multiplier (1 + waste_percent/100). 5 % covers an uneven base, hand work at edges and material left in the truck. Unit: %.","type":"number","minimum":0,"maximum":50,"default":5,"examples":[5],"x-unit":"%"}},"additionalProperties":false,"required":["area","thickness"]},"output_schema":{"type":"object","properties":{"volume_ft3":{"description":"area × thickness. Unit: ft³.","type":"number","x-unit":"ft³"},"volume_m3":{"description":"Same volume in cubic metres. Unit: m³.","type":"number","x-unit":"m³"},"weight_lb":{"description":"volume × density. Unit: lb.","type":"number","x-unit":"lb"},"weight_kg":{"description":"Weight in kilograms. Unit: kg.","type":"number","x-unit":"kg"},"tons_us":{"description":"weight_lb / 2000. Unit: short tons.","type":"number","x-unit":"short tons"},"tonnes_metric":{"description":"weight_kg / 1000. Unit: t.","type":"number","x-unit":"t"},"with_waste_tons_us":{"description":"tons_us × (1 + waste_percent/100). Unit: short tons.","type":"number","x-unit":"short tons"},"with_waste_tonnes":{"description":"tonnes_metric × (1 + waste_percent/100). Unit: t.","type":"number","x-unit":"t"}}},"formula":"volume = area × thickness; weight = volume × density; tons_us = weight_lb / 2000; tonnes = weight_kg / 1000; order = weight × (1 + waste_percent/100). 1 lb/ft³ = 16.0185 kg/m³; 145 lb/ft³ ≈ 110 lb per yd² per inch of thickness.","method":"145 lb/ft³ (2.32 t/m³) is the conventional compacted density of dense-graded hot-mix asphalt (actual mixes run about 140–150 lb/ft³ depending on aggregate and air voids); asphalt is sold by weight, so the waste allowance covers base irregularities and yield loss. Planning estimate only; check quantities against the supplier's coverage figures and local code before ordering.","sources":[{"name":"Wikipedia – Asphalt concrete","url":"https://en.wikipedia.org/wiki/Asphalt_concrete","type":"reference","retrieved_at":"2026-09-24"},{"name":"Wikipedia – Asphalt","url":"https://en.wikipedia.org/wiki/Asphalt","type":"reference","retrieved_at":"2026-09-24"}],"freshness":{"type":"static","max_age_seconds":null,"note":"Deterministic formula with fixed constants; results never go stale. Inputs supplied by the caller determine the output."},"examples":[{"name":"1,000 ft² at 3 in, 145 lb/ft³, 5 % waste","inputs":{"area":1000,"area_unit":"ft2","thickness":3,"thickness_unit":"in","density":145,"density_unit":"lb_ft3","waste_percent":5},"expected":{"volume_ft3":250,"volume_m3":7.079,"weight_lb":36250,"tons_us":18.125,"tonnes_metric":16.443,"with_waste_tons_us":19.031,"with_waste_tonnes":17.265},"url":"https://tttkmbb.com/api/v1/calculate/asphalt-tonnage?area=1000&area_unit=ft2&thickness=3&thickness_unit=in&density=145&density_unit=lb_ft3&waste_percent=5"},{"name":"100 m² at 75 mm, 2,322 kg/m³, 5 % waste","inputs":{"area":100,"area_unit":"m2","thickness":75,"thickness_unit":"mm","density":2322,"density_unit":"kg_m3","waste_percent":5},"expected":{"volume_m3":7.5,"volume_ft3":264.86,"weight_kg":17415,"tonnes_metric":17.415,"tons_us":19.197,"with_waste_tonnes":18.286},"url":"https://tttkmbb.com/api/v1/calculate/asphalt-tonnage?area=100&area_unit=m2&thickness=75&thickness_unit=mm&density=2322&density_unit=kg_m3&waste_percent=5"}],"faq":[{"q":"How thick should a driveway be?","a":"Typically 2–3 in (50–75 mm) of compacted asphalt over 6–8 in (150–200 mm) of compacted aggregate base for residential driveways; commercial lots use 3–4 in or more. Thickness is measured after compaction."},{"q":"Where does 145 lb/ft³ come from?","a":"It is the common estimating density for compacted dense-graded hot mix (≈ 2.32 g/cm³, or 110 lb per square yard per inch). Loose mix in the truck is lighter, but suppliers sell by weight."}],"tags":["asphalt calculator","asphalt tonnage","tons of asphalt","hot mix asphalt","asphalt driveway","asphalt weight"],"related":[{"calculator_id":"gravel","reason":"Aggregate base under the asphalt."},{"calculator_id":"concrete-slab","reason":"Concrete alternative for the same area."},{"calculator_id":"density-mass-volume","reason":"Weight from volume and density for other materials."}],"links":{"html":"https://tttkmbb.com/construction/asphalt-tonnage","markdown":"https://tttkmbb.com/construction/asphalt-tonnage.md","json":"https://tttkmbb.com/construction/asphalt-tonnage.json","api":"https://tttkmbb.com/api/v1/calculate/asphalt-tonnage","schema":"https://tttkmbb.com/api/v1/calculators/asphalt-tonnage","openapi":"https://tttkmbb.com/openapi.json","mcp":"https://tttkmbb.com/mcp"},"version":"v1","updated_at":"2026-09-24"},"timestamp":"2026-09-24T03:47:35Z"}