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This asphalt calculator estimates how many tons of hot-mix asphalt you need to pave a driveway, parking area or path. Enter the area and the compacted thickness, and it converts the volume into US tons, metric tonnes and cubic yards using a standard asphalt density.
How to Use the Asphalt Calculator
- Enter the length and width of the area to pave.
- Enter the compacted thickness of the asphalt layer.
- Add an allowance for uneven ground and edges (5% is typical).
- Optionally enter the price per ton to estimate material cost.
Asphalt Tonnage Formula
Tons = Length (ft) × Width (ft) × Thickness (ft) × 145 lb/cu ft ÷ 2,000
Most hot-mix asphalt weighs 142–148 lb per cubic foot once compacted; the calculator uses the 145 lb average (about 2,323 kg/m³). Suppliers sell asphalt by the ton, so converting volume to weight is the key step.
Example
A 50 × 12 ft driveway paved 3 in thick has a volume of 50 × 12 × 0.25 = 150 cu ft. 150 × 145 = 21,750 lb, or 10.9 tons. With 5% extra, order about 11.4 tons.
Asphalt Coverage per Ton
| Compacted thickness | Coverage per US ton | Coverage per tonne |
|---|---|---|
| 1 in (2.5 cm) | 166 sq ft | 17.0 m² |
| 2 in (5.1 cm) | 83 sq ft | 8.5 m² |
| 3 in (7.6 cm) | 55 sq ft | 5.7 m² |
| 4 in (10.2 cm) | 41 sq ft | 4.2 m² |
| 6 in (15.2 cm) | 28 sq ft | 2.8 m² |
How Thick Should Asphalt Be?
- Residential driveways: 2–3 in of compacted asphalt over 4–8 in of compacted gravel base.
- Paths and patios: 1.5–2 in.
- Parking lots and heavy traffic: 3–4 in or more, often laid in two layers (binder and surface course).
Calculate the gravel base separately with our gravel calculator.
Asphalt vs Concrete Driveways
Asphalt costs less to install and handles freeze-thaw cycles well but needs sealing every few years. Concrete lasts longer and needs less maintenance but costs more upfront; compare with our concrete driveway cost calculator.
Sources
Frequently Asked Questions
How many tons of asphalt do I need for a driveway?
Multiply length × width × thickness in feet, then multiply by 145 and divide by 2,000. A 600 sq ft driveway at 3 in thick needs about 11 tons.
How much does a ton of asphalt cover?
One ton covers about 80 sq ft at 2 in thick or about 55 sq ft at 3 in thick.
How much does asphalt weigh per cubic yard?
Compacted hot-mix asphalt weighs about 3,900 lb (roughly 2 tons) per cubic yard.
How thick should an asphalt driveway be?
Most residential driveways use 2–3 inches of compacted asphalt over a well-compacted gravel base.
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