Understanding your result
The base weight represents the finished geometry. Order weight adds your allowance for the job; the scenario table shows how different allowances change the estimate, without recommending one.
Estimate an aggregate layer separately with the Gravel Calculator .
The formula
Density is mass per unit volume. Multiplying the finished pavement volume by a compatible compacted density gives mass. Compaction changes volume and air voids, so a loose-layer depth should not be paired blindly with a compacted density.
Worked example
A 100 m² surface with a finished thickness of 5 cm has a volume of 5 m³. At 2,400 kg/m³ it contains 12 tonnes. A 5% allowance gives 12.6 tonnes, costing 1,260 at 100 per tonne.
How to use this calculator
- Measure the paving area and specify the finished thickness of this asphalt lift.
- Enter the compacted density for the selected mix.
- Choose an order allowance and a supplier price per metric tonne.
Keep the thickness basis consistent
The depth field describes the finished compacted layer, not the loose material immediately behind the paver. Density should correspond to that same finished state. Different mixes and compaction results produce different values. Obtain project-specific information instead of assuming that the example density applies to every driveway or road.
What the cost leaves out
The subtotal prices asphalt material only. Site preparation, aggregate base, tack coat, transport, plant minimums, equipment, labor, and traffic management may be separate items. Multiple lifts with different thicknesses or mixes should be calculated individually. The tool estimates a quantity; it does not decide whether a pavement design is adequate for traffic or soil conditions.
Assumptions & limitations
What this calculation assumes
- The measured area, thickness, and density refer to one uniform asphalt lift.
What to keep in mind
- No pavement design, load-capacity assessment, or complete contractor quotation.
Common questions
Does the allowance change finished thickness?
No. It adds material to the order while preserving the entered finished dimensions.
Can I enter a percentage density?
No. Enter mass density in kg/m³. Relative density expressed as a percentage of a reference is a different quantity.