How to use the asphalt calculator
Asphalt is ordered by weight, but a driveway is drawn in plan and specified by thickness. This calculator converts the paved area and compacted thickness into volume and then into US tons or metric tonnes using the density of the mix, so you can check a contractor's quote, plan deliveries or compare asphalt with concrete or pavers.
- Choose units and a shape. Use a rectangle for a straight driveway, a circle for a turning area, or enter a known area for anything irregular (split it into rectangles and add them up).
- Enter the compacted thickness, the finished thickness after rolling.
- Pick a mix density. The presets are estimates; use your asphalt plant's figure if you have it.
- Add waste, typically 5–10% for edges, uneven base and hand work.
- Optionally add the aggregate base depth, your supplier's truck load and a price per ton.
Asphalt tonnage formula
Volume = area × compacted thickness
US: tons = area (ft²) × thickness (in) ÷ 12 × density (lb/ft³) ÷ 2,000
Metric: tonnes = area (m²) × thickness (mm) ÷ 1,000 × density (t/m³)
Order = tons × (1 + waste) · truckloads = ⌈order ÷ truck load⌉
Rule of thumb: about 110–115 lb per yd² per inch at 145–150 lb/ft³
The density values below are estimates for planning only. Asphalt density depends on the aggregate, binder content and compaction achieved on site.
| Material | Density used (estimate) | Per yd² per inch |
|---|---|---|
| Hot mix asphalt, compacted | 145 lb/ft³ · 2.32 t/m³ | about 109 lb |
| Dense mix, well compacted | 150 lb/ft³ · 2.40 t/m³ | about 113 lb |
| Recycled millings, compacted | 128 lb/ft³ · 2.05 t/m³ | about 96 lb |
| Crushed stone base, compacted | 112 lb/ft³ · 1.8 t/m³ | about 84 lb |
Worked examples
A single-car driveway in US units
A 50 × 12 ft driveway is paved 3 in thick. The area is 600 ft² and the volume is 600 × 3 ÷ 12 = 150 ft³. At 145 lb/ft³ that is 21,750 lb, or 10.9 US tons. With 5% waste, order about 11.4 tons, which fits in one 15 ton truckload. A 6 in crushed stone base at about 112 lb/ft³ adds 300 ft³, or roughly 17.6 tons with waste.
A metric driveway
A 20 × 4 m driveway gets a 60 mm surface course. The area is 80 m² and the volume 4.8 m³. At 2.32 t/m³ that is 11.1 tonnes, or 11.7 tonnes with 5% waste.
A circular turning area
A turning circle 30 ft across is paved 2 in thick. The area is π × 15² = 707 ft², the volume 118 ft³, and the weight at 145 lb/ft³ about 17,080 lb, or 8.5 tons. With 5% waste that is about 9 tons.
Who this calculator helps
- Architects and landscape architects checking hard-landscape quantities and comparing paving options early in design.
- Paving contractors and estimators pricing driveways and planning truck deliveries.
- Builders and developers budgeting access roads, parking bays and driveways on residential schemes.
- Homeowners sanity-checking a driveway quote before they sign.
Practical tips
- Most driveway failures start in the base, not the asphalt. Get the subgrade and aggregate base right, and work out the stone with the gravel calculator and the dig with the excavation calculator.
- Give the surface a fall so water runs off; the slope calculator converts falls between percent, ratio and degrees.
- Comparing finishes? Price the same area in concrete with the concrete calculator or in block paving with the paver calculator.
- Hot mix has to be laid and rolled while it is hot, so plan the truck schedule so the crew is never waiting or rushing.
- Check local rules on permeable surfaces and drainage before paving a front garden or large area.
Want to see a new driveway in front of the house before you pave? Try surfaces and edging on a photo with AI Exterior Redesign.
