How to use the asphalt calculator
Enter the driveway's size and the finished, compacted thickness you want. Asphalt is laid loose and rolled down by about a quarter, so always work from the compacted figure; the density of 145 lb per cubic foot is for compacted hot-mix. The result is in short tons (2,000 lb), the unit asphalt plants sell by.
If you're paving over an existing gravel drive in good shape, set the base depth to 0. For a new drive, the gravel base is usually the bigger job.
The formula
cubic feet = area (ft²) × thickness (ft)
pounds = cubic feet × 145
tons = pounds ÷ 2,000
Worked example: a 50 × 12 ft driveway, 3 inches compacted
- Area: 50 × 12 = 600 ft².
- Volume: 600 × (3 ÷ 12) = 150 ft³.
- Add 5%: 150 × 1.05 = 157.5 ft³.
- Weight: 157.5 × 145 = 22,838 lb, which is 11.42 tons.
A 6 inch gravel base under it is another 300 ft³ (11.1 yd³), about 16 tons of crushed stone.
Recommended thickness
| Use | Asphalt (compacted) | Gravel base |
|---|---|---|
| Path, cart track | 2 in | 4 in |
| Home driveway, cars | 2-3 in | 4-8 in |
| Driveway with RVs or delivery trucks | 3-4 in, often in two lifts | 8 in or more |
| Overlay on sound old asphalt | 1½-2 in | None |
These are typical residential figures. A paving contractor will size the base to your soil: clay and wet ground need more.
Things that change the estimate
- Edges and flares. Driveways widen where they meet the street. Measure the flare as a triangle or trapezoid and add it.
- Uneven base. Low spots fill with asphalt, which is expensive. A well-graded base keeps the tonnage close to the estimate.
- Minimum loads. Plants and contractors have minimums, so small patches often cost more per ton. For a pothole or two, bagged cold patch is the practical choice.
- Season. Hot-mix plants in cold climates close for winter, and asphalt can't be laid well on cold ground.
Questions people ask
How many tons of asphalt do I need for a driveway?
Multiply length × width × compacted thickness in feet, multiply by 145 lb per cubic foot and divide by 2,000. A 50 × 12 ft driveway at 3 inches is 150 cubic feet, about 10.9 tons, or 11.4 tons with 5% extra.
How thick should an asphalt driveway be?
Residential driveways are usually 2 to 3 inches of compacted asphalt over 4 to 8 inches of compacted gravel base. Driveways that see heavy trucks, or sit on poor soil, need more of both.
How much does a ton of asphalt cover?
At 2 inches compacted, one ton covers about 83 square feet. At 3 inches about 55, and at 4 inches about 41. The industry shorthand is roughly 110 lb per square yard per inch of thickness.
How much does a cubic yard of asphalt weigh?
Compacted hot-mix asphalt weighs about 145 to 150 lb per cubic foot, so roughly 1.96 to 2.0 tons per cubic yard. Loose asphalt in the truck is lighter, around 110 to 120 lb per cubic foot.
Is asphalt sold by the ton or the yard?
By the ton. Plants weigh every truck. Your paving contractor quotes per ton or per square foot installed.
Sources and assumptions
- National Asphalt Pavement Association (NAPA): compacted hot-mix about 145-150 lb/ft³
- Pavement Interactive: HMA density and volume relationships
- Base gravel uses 1.45 tons/yd³ for dense-graded crushed stone (Vulcan Materials product calculators).
Last reviewed 27 October 2026. Every formula on this page is checked against the worked example above in our automated tests. Found a problem? Tell us.