About the Asphalt Calculator
This asphalt calculator estimates the tonnage of hot-mix asphalt needed to pave a driveway, walkway, patio or parking area. Enter the length, width and compacted thickness, and it converts the volume to weight using the density of compacted asphalt — about 145 pounds per cubic foot — then adds an allowance for waste and uneven base before pricing the job by the ton.
Asphalt plants and paving contractors quote by the ton, so this is the number you need to compare bids or order material. It suits homeowners planning a new driveway or overlay, property managers budgeting a lot resurfacing and small contractors running a quick take-off.
Residential driveways are commonly paved 2–3 inches thick over a compacted gravel base, while areas used by heavy trucks often need 4 inches or more. The cost shown is material only; installed prices also include base preparation, equipment and labor.
With the default inputs, the asphalt needed is 11.42 tons. Change any value above to recalculate instantly.
How to use the asphalt calculator
- 1Measure the length and width of the area to be paved in feet.
- 2Enter the compacted thickness — usually 2–3 in for a driveway.
- 3Keep the default density of 145 lb/ft³ unless your supplier gives another figure.
- 4Add a waste allowance and the price per ton from your local plant.
- 5Use the tonnage to order material or compare contractor bids.
Formula and method
The paved volume in cubic feet is length × width in feet times the thickness in inches divided by 12. Multiplying by the compacted density ρ (pounds per cubic foot) gives the weight in pounds, and dividing by 2,000 converts it to US short tons — the unit asphalt plants sell by.
A waste or overage allowance (typically 5–10%) covers low spots in the base, edge loss and the material left in the truck. Material cost is simply tons × price per ton. Cubic yards are shown too because some suppliers quote volume: one cubic yard of compacted asphalt weighs roughly 3,900 lb, or close to 2 tons.
- L, W
- Length and width of the paved area (ft)
- T
- Compacted thickness (in)
- ρ
- Asphalt density (lb/ft³), about 145
- waste%
- Overage allowance
Worked examples
Single-car driveway, 50 × 12 ft at 3 in
A 600 sq ft driveway at 3 in thick holds 150 cu ft of asphalt. At 145 lb/ft³ that is 21,750 lb or 10.88 tons, and 5% overage brings it to 11.42 tons — about $1,370 at $120 per ton.
Small parking area, 100 × 20 ft at 4 in
A 2,000 sq ft lot paved 4 in thick needs 666.7 cu ft of asphalt, which weighs 48.3 tons; with 5% overage you should order about 50.75 tons, costing roughly $5,583 at $110 per ton.
2-inch overlay on a 40 × 10 ft path, no waste
A 400 sq ft path overlaid 2 in thick is 66.7 cu ft or 2.47 cu yd. At 145 lb/ft³ that is 4.83 tons, costing about $628 at $130 per ton.
Frequently asked questions
How many tons of asphalt do I need for a driveway?+
Multiply length × width × thickness (in feet) to get cubic feet, multiply by about 145 lb/ft³ and divide by 2,000. A typical 600 sq ft single-car driveway at 3 in needs roughly 11 tons.
How much does a ton of asphalt weigh per square foot?+
Compacted asphalt weighs about 145 lb per cubic foot, so each inch of thickness adds about 12 lb per square foot. One ton covers roughly 55 sq ft at 3 in thick or 80 sq ft at 2 in.
How thick should an asphalt driveway be?+
Most residential driveways are 2–3 inches of compacted asphalt over 4–8 inches of compacted gravel base. Driveways that carry RVs, delivery trucks or heavy equipment often use 3–4 inches or more.
How many cubic yards are in a ton of asphalt?+
At 145 lb/ft³ a cubic yard of compacted asphalt weighs about 3,915 lb, so one ton is roughly 0.51 cubic yards and one cubic yard is close to 2 tons.
Does this include the gravel base?+
No. This tool covers the asphalt layer only. Use the gravel calculator to estimate the crushed stone base, which is usually 4–8 inches deep under a driveway.