Concrete CalcKit

Asphalt Calculator

Find how many tons of hot mix asphalt a driveway or patch job needs. Enter the area and thickness to get the tonnage, with a waste allowance.

Asphalt needed

Asphalt needed
0.00
US tons
Volume
0.00
cubic yards
Area
0.0
ft²

Assumes hot mix asphalt at ~145 lb per cubic foot (~2 US tons per cubic yard).

How to calculate asphalt

Asphalt is ordered by weight, but the estimate still starts with volume. Find the area in square feet (length × width for a rectangle, or π × radius² for a circular pad), multiply by the thickness converted to feet (thickness in inches ÷ 12) to get cubic feet, then convert to weight using the mix density. Hot mix asphalt weighs roughly 145 lb per cubic foot, which is about 2 US tons per cubic yard. The formula is tons = area (ft²) × thickness (in) ÷ 12 × 145 lb/ft³ ÷ 2,000, and the calculator above runs this automatically along with the cubic yard figure.

How thick should asphalt be?

A standard residential driveway uses 2 to 3 inches of compacted asphalt laid over a compacted gravel base. Driveways that see heavier or more frequent traffic, like a shared driveway, RV pad or light commercial area, typically go to 3 to 4 inches, sometimes placed in two lifts (a base lift and a thinner top lift) rather than one thick pour, since asphalt compacts better in layers under about 3 inches each.

The base underneath still matters

Asphalt is a wearing surface, not a structural base; without a properly compacted sub-base it will crack and rut regardless of thickness. A typical build is a graded, compacted subgrade, then 4 to 8 inches of compacted gravel or crushed stone for drainage and load support, then the asphalt on top. Size that base layer with the gravel calculator or crushed stone calculator before estimating the asphalt itself.

Patch jobs and waste

For a pothole or small patch, measure the patch area and the depth of asphalt needed to bring it flush with the surrounding surface, and expect to round up to the nearest available bag if using cold patch material rather than hot mix from a plant. For a full driveway, a 5 percent waste allowance covers compaction, spillage and trim at the edges. Because asphalt mix density varies slightly by supplier and aggregate blend, confirm the exact tons-per-yard figure with your paving contractor before placing a large order.

Frequently Asked Questions

How many tons of asphalt do I need per square foot?
It depends on thickness. Hot mix asphalt weighs roughly 145 lb per cubic foot (about 2 US tons per cubic yard). At a 2 inch thickness, that works out to about 12 lb per square foot, or roughly 165 square feet per ton. Enter your exact area and thickness above for a precise figure.
How thick should an asphalt driveway be?
A residential driveway typically uses 2 to 3 inches of compacted asphalt over a compacted gravel base. Areas carrying heavier vehicles, like a shared driveway or light commercial lot, often go to 3 to 4 inches. Always lay asphalt in compacted lifts rather than one thick pour.
Do I need a gravel base under asphalt?
Yes. Asphalt is a surface layer, not a structural base. A typical build is 4 to 8 inches of compacted gravel or crushed stone, graded for drainage, with the asphalt placed on top. Size the base separately with the gravel or crushed stone calculator.
Does asphalt weight vary by mix type?
Yes, somewhat. Dense-graded hot mix typically runs 140 to 150 lb per cubic foot depending on the aggregate and mix design. The calculator uses 145 lb per cubic foot as a reasonable default; your paving contractor or supplier can give you the exact figure for their mix.

Related calculators

Paver CalculatorPatios and walkways. Paver count plus sand base.Flagstone CalculatorPatios and steppers. Tons needed by thickness.Retaining Wall Block CalculatorBlock count by wall length, height and base gravel.Concrete CalculatorSlabs, footings and columns. Cubic yards, m³ and bags.Rebar CalculatorSlab grid spacing. Linear feet, stock lengths and weight.Gravel CalculatorDriveways and paths. Cubic yards and tons of gravel.