Asphalt Calculator
Hot-mix asphalt is sold by the ton, but you measure your job in feet and inches — so the hard part is converting a paved area into the tonnage a supplier will quote. This calculator does it instantly. Enter the length and width of the surface, the compacted thickness and the mix density, and it returns the tons of asphalt you need, the square footage, the cubic yards and an optional total cost. It works for driveways, parking lots, patches and private roads.
How to estimate asphalt tonnage
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1
Measure the surface
Enter the length and width of the area in feet. For an irregular lot, split it into rectangles and add the results together.
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2
Set thickness and density
Enter the compacted thickness in inches and the mix density in pounds per cubic foot. Standard hot-mix asphalt is about 145 lb/ft³.
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3
Read the tonnage and cost
The tool shows tons, square footage and cubic yards instantly. Add a price per ton to see the estimated total material cost.
The formula
Asphalt tonnage is volume times density, with the units lined up:
- Area = length (ft) × width (ft) → square feet
- Cubic feet = area × (thickness in inches ÷ 12)
- Tons = cubic feet × density (lb/ft³) ÷ 2,000
- Cubic yards = cubic feet ÷ 27
The density figure is the one to get right. Standard compacted hot-mix asphalt weighs roughly 145 lb per cubic foot (about 2 tons per cubic yard). Denser surface mixes can run to 150 lb/ft³; lighter, more porous mixes a little less. If your supplier gives you an exact density for the product, enter it for a tighter estimate.
Worked example
Say you are paving a driveway that is 50 ft long, 10 ft wide, at a compacted 2-inch thickness, using a 145 lb/ft³ mix:
- Area = 50 × 10 = 500 sq ft
- Cubic feet = 500 × (2 ÷ 12) = 83.3 cu ft
- Tons = 83.3 × 145 ÷ 2,000 = 6.04 tons
- Cubic yards = 83.3 ÷ 27 = 3.09 cu yd
At $100 per ton that is about $604 of material before delivery and labor.
Quick reference
| Area (ft) | Thickness | Tons (approx.) | Cubic yards |
|---|---|---|---|
| 20 × 10 | 2“ | 2.42 | 1.23 |
| 50 × 10 | 2“ | 6.04 | 3.09 |
| 50 × 20 | 3“ | 18.13 | 9.26 |
| 100 × 24 | 4“ | 58.00 | 29.63 |
Common pitfalls
- Thickness is in inches. The tool divides by 12 for you. Do not enter 0.17 expecting two inches.
- Compacted vs. loose depth. Asphalt compacts as it is rolled. Specify the finished, compacted thickness — your paver lays it thicker before rolling.
- Order a little extra. Add roughly 5–10% for waste, edges and uneven sub-base so you do not run short mid-pour while the mix is still hot.
- Density varies by mix. Surface, binder and base courses differ. Use the supplier’s stated density rather than assuming 145 lb/ft³ when cost is tight.
Frequently Asked Questions
At a 2-inch compacted thickness with standard mix, roughly 0.012 tons per square foot — so a 500 sq ft driveway needs about 6 tons. Thicker paving scales the tonnage up proportionally.
Two to three inches of compacted asphalt suits most residential driveways over a solid aggregate base. Heavier loads, such as parking lots and roads, usually call for four inches or more.
Standard hot-mix asphalt is about 145 lb per cubic foot, the default here. Denser surface mixes can reach 150 lb/ft³. If your supplier provides an exact density, enter it for a more precise tonnage.
No. The calculation runs entirely in your browser as you type. None of your dimensions, prices or results are uploaded, saved or shared.
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