Asphalt is bought by the ton but laid by area and thickness. Residential driveways typically get 2–3 in of compacted hot-mix asphalt over 4–8 in of compacted aggregate base; parking lots and roads carry more. Compacted asphalt weighs about 145 lb per cubic foot – about 110 lb per square yard per inch of thickness.
How to use the Asphalt Calculator
- Length
- Width
- Compacted thickness
- Asphalt density
- Waste
- Price
- Every result field is editable: type into Asphalt needed and Compacted thickness plus every other field update to match.
Results update as you type, and every field accepts the units shown in its menu.
How it works
Enter the length, width and compacted thickness, the density of the mix, waste and the price per ton. The calculator returns the area, volume, tonnage and cost.
Tips for an accurate estimate
- Plan driveways and paths in layers – a compacted base of larger stone does most of the structural work.
- Add 10–25% for compaction: loose stone shrinks once it is rolled or driven on.
- Ask the quarry whether prices are per US ton, metric tonne or cubic yard before comparing quotes.
- Grade surfaces at 1–2% so water runs off rather than soaking into the base.
Common mistakes to avoid
- Skipping the base layer or geotextile on soft soil, which leads to ruts and potholes.
- Using rounded stone (pea gravel, river rock) on surfaces that carry vehicles.
- Ordering compacted volume when the supplier delivers loose material.
Inputs explained
| Field | What to enter |
|---|---|
| Length | Units: ft, m, in, yd, cm |
| Width | Units: ft, m, in, yd, cm |
| Compacted thickness | Units: in, cm, mm, ft, m |
| Asphalt density | Units: kg/m³, lb/ft³, g/cm³, lb/yd³ |
| Waste | In % |
| Price | Units: /US ton, /t, /lb, /kg |
What each result means
- Area = [Length]×[Width]
- Volume = [Length]×[Width]×[Compacted thickness]
- Asphalt needed = [Volume]×[Asphalt density]×(1 + [Waste]÷100)
- Cost = [Asphalt needed]×[Price]
Example values
How the main result changes when Compacted thickness changes and everything else stays at the example values above:
| Compacted thickness (in) | Asphalt needed (US ton) |
|---|---|
| 1.5 | 5.51 |
| 2.25 | 8.27 |
| 3 | 11.03 |
| 3.75 | 13.78 |
| 4.5 | 16.54 |
| 6 | 22.05 |
Formula
Volume = L × W × thicknessWeight = volume × density (≈ 2,243 kg/m³ or 145 lb/ft³ compacted)Cost = weight × (1 + waste) × price per tonWorked example
Inputs — Length: 50 ft; Width: 12 ft; Compacted thickness: 3 in; Asphalt density: 2,243 kg/m³; Waste: 5 %; Price: $100 /US ton.
Results — Area = 600 ft²; Volume = 5.56 yd³; Asphalt needed = 11.03 US ton; Cost = $1,102.70.
Frequently asked questions
How many tons of asphalt do I need?
About 0.055 US tons per square yard per inch (110 lb). A 12 × 50 ft driveway at 3 in needs about 11 tons.
How thick should an asphalt driveway be?
2–3 in compacted for cars over a good base; 3–4 in for heavier traffic.
What is the density of asphalt?
140–150 lb/ft³ (2,240–2,400 kg/m³) compacted.
What formula does the Asphalt Calculator use?
Volume = L × W × thickness.