How to estimate asphalt
- Measure the area to be paved in feet. Break curved or irregular driveways into rectangles, circles and triangles.
- Choose the compacted thickness — the finished depth after rolling, not the loose depth dumped from the truck.
- Multiply by density. Compacted hot mix asphalt weighs about 145 lb per cubic foot (roughly 1.96 tons per cubic yard).
- Add 5–10% for edges, uneven base and waste.
Asphalt tonnage formula
Tons = Cubic feet × 145 ÷ 2,000
Worked example: a two-car driveway
A driveway 50 ft long and 12 ft wide is 600 sq ft. At 3 in compacted, that is 600 × 3 ÷ 12 = 150 cubic feet. At 145 lb/ft³, the mix weighs 21,750 lb, or 10.88 tons. With 5% extra, order about 11.4 tons.
How thick should asphalt be?
| Use | Typical compacted asphalt | Typical aggregate base |
|---|---|---|
| Residential driveway (cars) | 2–3 in | 4–8 in |
| Driveway with occasional trucks or RVs | 3–4 in | 8 in or more |
| Walking path or golf cart path | 2 in | 4 in |
| Light commercial parking | 3–4 in, often in two lifts | 6–10 in |
| Patch or overlay | 1½–2 in | Existing pavement |
These are common planning ranges. Soft soils, cold climates and heavy vehicles call for a thicker section, which a local paving contractor or engineer should set.
Asphalt tonnage chart
Tons of hot mix per 100 sq ft at 145 lb/ft³, before waste:
| Compacted thickness | Tons per 100 sq ft | Sq ft per ton |
|---|---|---|
| 1½ in | 0.91 | 110 |
| 2 in | 1.21 | 83 |
| 2½ in | 1.51 | 66 |
| 3 in | 1.81 | 55 |
| 4 in | 2.42 | 41 |
The base matters more than the blacktop
Most asphalt failures — potholes, alligator cracking, sinking edges — start below the surface. A durable driveway needs firm, well-drained subgrade, a compacted crushed-stone base, and a slight crown or cross-slope so water runs off. Use the gravel calculator to estimate the base stone, and see our gravel driveway layers guide for how base courses are built.
Paving tips
- Hot mix must be placed and rolled while it is hot. Plants often have minimum orders and may not supply very small jobs; for small patches, ask about cold patch or bagged asphalt.
- Thick sections are laid in two or more lifts so each layer compacts properly.
- Asphalt prices track oil prices and change through the season, so get a current per-ton quote and enter it above.
- Seal-coating is usually done after the surface has cured for several months, not right away.
Frequently asked questions
How many tons of asphalt do I need for a driveway?
Multiply the area in square feet by the compacted thickness in inches, divide by 12, then multiply by 145 and divide by 2,000. A 600 sq ft driveway at 3 in needs about 10.9 tons before waste.
How much does a ton of asphalt cover?
At 145 lb per cubic foot, one ton covers about 83 sq ft at 2 in thick, 55 sq ft at 3 in, or 41 sq ft at 4 in.
How much does a cubic yard of asphalt weigh?
Compacted hot mix asphalt weighs about 3,900 lb (roughly 1.96 tons) per cubic yard. Loose, uncompacted mix weighs less per yard.
How thick should an asphalt driveway be?
Residential driveways are commonly 2–3 in of compacted asphalt over 4–8 in of compacted crushed stone. Heavier vehicles need a thicker section.
Should I order extra asphalt?
Yes. About 5–10% extra covers edges, low spots in the base and handling losses. Running short on hot mix leaves a cold joint in the pavement.
Sources & standards
This calculator's formulas and default values are based on the following codes, standards and published data. Codes are adopted and amended locally, so check with your building department for permitted work. See how we build and check our calculators.
- Asphalt Institute, MS-4 The Asphalt Handbook and residential driveway guidance: thickness and base recommendations.
- National Asphalt Pavement Association (NAPA) publications on hot mix asphalt paving and compaction.
- Typical compacted hot mix density of about 145 lb/ft³ (≈ 2,320 kg/m³); actual density varies by mix design.