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Asphalt Tonnage Calculator

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.

Area (ft² or m²)Area to pave in ft² or m² (see area_unit). Area unit (optional)Unit of the area input; areas are reported in both m² and ft². Compacted thickness (in or mm)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. Thickness unit (optional)Unit of thickness. Compacted density (optional)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. Density unit (optional)Unit of density. Waste allowance (%) (optional)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.

When to use

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.

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.

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.

Inputs

Parameter	Type	Unit	Required	Description
`area`	number	ft² or m²	yes	Area to pave in ft² or m² (see area_unit). Range: > 0, ≤ 10000000
`area_unit`	enum: m2 \| ft2		default ft2	Unit of the area input; areas are reported in both m² and ft².
`thickness`	number	in or mm	yes	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. Range: > 0, ≤ 1000
`thickness_unit`	enum: in \| mm		default in	Unit of thickness.
`density`	number		no	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. Range: > 0, ≤ 5000
`density_unit`	enum: lb_ft3 \| kg_m3		default lb_ft3	Unit of density.
`waste_percent`	number	%	default 5	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. Range: ≥ 0, ≤ 50

Outputs

Output	Type	Unit	Description
`volume_ft3`	number	ft³	area × thickness.
`volume_m3`	number	m³	Same volume in cubic metres.
`weight_lb`	number	lb	volume × density.
`weight_kg`	number	kg	Weight in kilograms.
`tons_us`	number	short tons	weight_lb / 2000.
`tonnes_metric`	number	t	weight_kg / 1000.
`with_waste_tons_us`	number	short tons	tons_us × (1 + waste_percent/100).
`with_waste_tonnes`	number	t	tonnes_metric × (1 + waste_percent/100).

Example

1,000 ft² at 3 in, 145 lb/ft³, 5 % waste: {"area":1000,"area_unit":"ft2","thickness":3,"thickness_unit":"in","density":145,"density_unit":"lb_ft3","waste_percent":5} → {"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}

100 m² at 75 mm, 2,322 kg/m³, 5 % waste: {"area":100,"area_unit":"m2","thickness":75,"thickness_unit":"mm","density":2322,"density_unit":"kg_m3","waste_percent":5} → {"volume_m3":7.5,"volume_ft3":264.86,"weight_kg":17415,"tonnes_metric":17.415,"tons_us":19.197,"with_waste_tonnes":18.286}

GET 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

Machine access

API: GET https://tttkmbb.com/api/v1/calculate/asphalt-tonnage (query parameters) or POST with a JSON body {"inputs": {...}}
Schema: https://tttkmbb.com/api/v1/calculators/asphalt-tonnage · Markdown: https://tttkmbb.com/construction/asphalt-tonnage.md · JSON definition: https://tttkmbb.com/construction/asphalt-tonnage.json
MCP: server https://tttkmbb.com/mcp, tool run_calculator with calculator_id="asphalt-tonnage"
OpenAPI operationId: estimate_asphalt_tonnage
Freshness: static. Authentication: none. Rate limit: fair use (see rate limits).

Sources

Wikipedia – Asphalt concrete (reference)
Wikipedia – Asphalt (reference)

FAQ

How thick should a driveway be?

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.

Where does 145 lb/ft³ come from?

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.

Related calculators

Gravel Calculator — Aggregate base under the asphalt.
Concrete Slab Calculator — Concrete alternative for the same area.
Density Calculator — Weight from volume and density for other materials.