How much asphalt do I need for a driveway?

Multiply the paved area by the compacted thickness to get the volume, then multiply by the density of hot-mix to get the weight, which is how asphalt is sold. A 40 ft by 12 ft drive at 2 inches compacted is 80 cubic feet, roughly 3 cubic yards, or around 6 tons at typical hot-mix density. Enter your own numbers and the tool does the same steps.

What density should I use for asphalt?

Compacted hot-mix asphalt runs around 145 pounds per cubic foot, which works out to about 2 tons per cubic yard, and that is the editable default here. Different mixes and aggregates shift it, so if your supplier quotes a density, type theirs in — it is the single number that moves the tonnage most.

How thick should an asphalt layer be?

That is a paving decision, not an arithmetic one, so this tool does not pick it for you — you enter the compacted thickness you have been told to lay. Bear in mind asphalt compacts as it is rolled, so the loose depth is greater than the finished depth; order against the finished thickness and let the crew account for compaction.

Should I order extra asphalt?

Yes, a little. Edges spread, thickness is never perfectly even, and a truck that leaves half a ton short is an expensive callback. The waste field defaults to 10 percent; keep it there for a clean rectangle and raise it for an irregular shape with a lot of edge work.

Asphalt calculator

This weighs a volume: your area times your compacted thickness times the density you enter. It does not decide how deep to pave, whether the base will hold up, or how much the mix will lose to compaction — those belong to your paving contractor and your supplier. Confirm the tonnage against their quote before the truck rolls.

Enter the length and width of the area you are paving and the compacted thickness, and the tool gives you the volume in cubic yards and cubic metres and the weight in tons — the unit an asphalt plant quotes and bills in. The density field is yours to change to whatever your supplier states for their mix.

Worked example

Say a driveway is 40 ft long and 12 ft wide, paved 2 inches thick. The area is 480 square feet; two inches is 1/6 of a foot, so the volume is 480 × 0.167 = 80 cubic feet, which is 80 ÷ 27 ≈ 2.96 yd³. At about 2 tons per cubic yard that is roughly 5.9 tons, and with 10% for edge spread you would order close to 6.5 tons.

The formula

weight = length × width × thickness × density

The area times the thickness is a volume; multiplying by density turns that volume into weight. Keep the thickness in the same length family as the rest — divide inches by 12 to get feet before multiplying — then convert cubic feet to cubic yards by dividing by 27. Because density is a weight per volume, it does the last step.

What this tool assumes

Only what you tell it. The thickness, the density and the waste percentage are all editable, because those are the figures that vary from job to job and supplier to supplier. Nothing about the base, the sub-grade or the compaction is baked in — the tool measures the mat, not the road under it.

Questions

How much asphalt do I need for a driveway?: Multiply the paved area by the compacted thickness to get the volume, then multiply by the density of hot-mix to get the weight, which is how asphalt is sold. A 40 ft by 12 ft drive at 2 inches compacted is 80 cubic feet, roughly 3 cubic yards, or around 6 tons at typical hot-mix density. Enter your own numbers and the tool does the same steps.
What density should I use for asphalt?: Compacted hot-mix asphalt runs around 145 pounds per cubic foot, which works out to about 2 tons per cubic yard, and that is the editable default here. Different mixes and aggregates shift it, so if your supplier quotes a density, type theirs in — it is the single number that moves the tonnage most.
How thick should an asphalt layer be?: That is a paving decision, not an arithmetic one, so this tool does not pick it for you — you enter the compacted thickness you have been told to lay. Bear in mind asphalt compacts as it is rolled, so the loose depth is greater than the finished depth; order against the finished thickness and let the crew account for compaction.
Should I order extra asphalt?: Yes, a little. Edges spread, thickness is never perfectly even, and a truck that leaves half a ton short is an expensive callback. The waste field defaults to 10 percent; keep it there for a clean rectangle and raise it for an irregular shape with a lot of edge work.

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