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Asphalt required
- Area
- 600 sq ft
- Volume
- 150 cu ft (5.56 cu yd)
- Weight
- 22,838 lb
- Asphalt is ordered and priced by the ton, not by volume — which is why the density conversion is the whole job. 157.5 cubic feet at 145 lb/ft³ is 22,838 pounds, or 11.42 tons.
- The aggregate base beneath the asphalt is a separate order, typically 4 to 8 inches of compacted crushed stone. Paving over an inadequate base is the most common cause of premature failure, and no amount of surface thickness compensates for it.
Tonnage by depth
The same 600 sq ft area at each common compacted thickness.
| Compacted depth | Tons | Typical use |
|---|---|---|
| 1.5 in | 5.71 | Overlay on sound existing asphalt |
| 2 in | 7.61 | Light residential surface course |
| 3 in (yours) | 11.42 | Residential driveway |
| 4 in | 15.23 | Heavy residential or light commercial |
| 6 in | 22.84 | Commercial lot, in two lifts |
| 8 in | 30.45 | Heavy truck traffic, in multiple lifts |
How do you calculate asphalt tonnage?
Multiply length by width by depth in feet for the volume, then multiply by the mix density of about 145 pounds per cubic foot and divide by 2,000. A 50 by 12 ft driveway at 3 inches needs 150 cubic feet, which is 10.9 tons.
tons = (area × depth ÷ 12) × density ÷ 2,000- area
- Length × width in square feet
- depth ÷ 12
- Compacted thickness converted from inches to feet
- density
- About 145 lb per cubic foot for compacted hot mix
- 2,000
- Pounds in a US short ton
The reason this calculation exists separately from a concrete one is the unit of sale. Concrete is ordered by volume, in cubic yards; asphalt is ordered by weight, in tons. So the volume is only an intermediate step, and the density conversion is where the answer actually comes from. Compacted hot mix runs roughly 142 to 148 pounds per cubic foot depending on the aggregate and binder, and 145 is the working figure — a 2% spread in density is a 2% spread in your order, which on a driveway is a few hundred pounds. Two practical constraints sit around the arithmetic. Depth is specified after compaction, and asphalt compacts by roughly a quarter during rolling, so the loose material laid is thicker than the finished surface. And a single lift much over 3 inches cannot be compacted uniformly through its depth, which is why thicker pavements are built as a binder course of coarser aggregate with a surface course above. The aggregate base below is always a separate order, and paving over an inadequate base is the most common reason a driveway fails early.
- Multiply length by width for the area in square feet.
- Divide the compacted depth in inches by 12 for feet.
- Multiply area by that depth for the volume in cubic feet.
- Add an allowance for uneven subgrade and edge spread.
- Multiply by the density, then divide by 2,000 for tons.
Worked example: A 50 × 12 ft driveway at 3 inches compacted, 145 lb/ft³, 5% waste
A 50 × 12 ft driveway at 3 inches compacted, 145 lb/ft³, 5% waste
The area is 50 × 12 = 600 square feet. A 3 inch compacted depth is 0.25 ft, so the volume is 600 × 0.25 = 150 cubic feet — which is 5.56 cubic yards, though that figure is not what you order. Adding 5% for uneven subgrade and edge spread gives 157.5 cubic feet. At 145 pounds per cubic foot that is 22,838 pounds, and dividing by 2,000 gives 11.42 tons. Without the waste allowance it would be 10.88 tons, so the allowance is worth about half a ton here. Depth is the input that moves the answer most: the same driveway at 2 inches needs 7.61 tons and at 4 inches needs 15.23 tons, so getting the specification right matters more than refining the density. Note that 4 inches would normally be placed as two lifts rather than one, since a single layer much over 3 inches cannot be compacted evenly.
What each asphalt input means
- Length
- The paved length in feet.
- Width
- The paved width. A single-car driveway is typically 10 to 12 ft.
- Compacted depth
- The finished thickness after rolling. A residential driveway is usually 2 to 3 inches of surface over a compacted aggregate base; a commercial lot needs more.
- Mix density
- Compacted hot-mix asphalt runs about 142 to 148 pounds per cubic foot. Your supplier can give the figure for the specific mix.
- Waste allowance
- Covers uneven subgrade, edge spread and material left in the truck.
- Price per ton
- Optional. Asphalt is sold by the ton, which is why the conversion matters.
What this asphalt does not account for
- Asphalt is sold by the ton, not by volume. The cubic-yard figure is only an intermediate step and ordering against it will give the wrong quantity entirely.
- Depth is specified after compaction. Loose material is roughly a quarter thicker than the finished surface, which the paving contractor accounts for when spreading.
- A single lift much over 3 inches cannot be compacted uniformly. Thicker pavements are built as a binder course with a surface course above, often with different mixes.
- The aggregate base is a separate order — typically 4 to 8 inches of compacted crushed stone. An inadequate base is the most common cause of early failure.
- Density varies with the mix, roughly 142 to 148 lb per cubic foot. Ask your supplier for the figure on the specific mix rather than assuming.
- Hot mix must be placed above a minimum ambient temperature, which rules out paving in cold weather in much of the country.
- Irregular shapes need breaking into rectangles and adding the areas. A curved or tapering driveway measured at its widest point will over-order significantly.
Frequently asked questions
How many tons of asphalt do I need for a driveway?
A 50 by 12 ft driveway at 3 inches compacted needs about 11.4 tons including a 5% allowance. The calculation is area times depth in feet, times 145 pounds per cubic foot, divided by 2,000.
How thick should an asphalt driveway be?
Two to three inches of compacted surface course over 4 to 8 inches of compacted aggregate base for residential use. Heavier vehicles need more, and the base matters more than the surface thickness.
How much does a ton of asphalt cover?
At 3 inches compacted, one ton covers roughly 55 square feet. At 2 inches it covers about 83 square feet. Coverage is inversely proportional to depth.
What does asphalt weigh per cubic foot?
Compacted hot mix is roughly 145 pounds per cubic foot, varying from about 142 to 148 depending on the aggregate and binder. That is around 3,915 pounds per cubic yard.
Can I pave over an existing asphalt driveway?
An overlay of 1.5 to 2 inches works if the existing surface is structurally sound and properly drained. Cracks that reflect through, or a failed base, need removal rather than covering.
Is asphalt cheaper than concrete?
Asphalt usually costs less to install and is faster to cure, but has a shorter life and needs periodic sealing. Concrete costs more up front and lasts longer with less maintenance.
Sources and review
Last reviewed .