How Many Tons of Asphalt for a 12x70 Driveway?

A 12 by 70 foot driveway covers 840 square feet. How many tons of asphalt for a 12x70 driveway depends mostly on the finished thickness: about 10.2 tons for a 2-inch overlay and about 15.2 tons for a 3-inch new surface, figured at roughly 145 lb per compacted cubic foot.

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Step-by-step math for 12x70

Area: 12 ft × 70 ft = 840 sq ft.
Thickness in feet: 3 inches ÷ 12 = 0.25 ft.
Volume: 840 × 0.25 = 210 cubic feet.
Weight: 210 × 145 lb = 30,450 lb.
Tons: divide by 2,000 = 15.2 tons.

Swap in your own thickness and the plant’s stated density if you have it. The asphalt tonnage calculator runs the same steps.

Tons at common thicknesses

Compacted thickness	Cubic feet	Tons (145 lb/ft³)	Tons +5%
2 in	140	10.2	10.7
2.5 in	175	12.7	13.3
3 in	210	15.2	16.0
4 in	280	20.3	21.3

Choosing a thickness

An overlay on pavement that is cracked but structurally sound is usually 1.5 to 2 inches. A new driveway on fresh base is more often 2.5 to 3 inches compacted. Where garbage trucks, campers or a loaded pickup will turn, plan on the heavier end and a thicker stone base below.

Ordering and trucks

Hot mix is sold by the ton and arrives in dump trucks that commonly haul 10 to 20 tons each. For 15.2 tons at 3 inches, figure roughly 2 loads at about 14 tons apiece. Ask the plant about minimums and the time the mix will hold heat on the haul. See how many tons in a truckload of asphalt for more on load sizes.

Things that change the tonnage

Uneven base. Low spots fill with extra mix. A base that is graded and compacted flat keeps the tonnage close to the math.
Edges and flares. Curved edges, a wider apron at the street or a turnaround add square footage. Measure those separately and add them in.
Density. Mixes typically range from about 140 to 150 lb per compacted cubic foot. Ask your plant for its number if you need tight figures.
Waste. Many estimators add 5 to 10 percent for handling, raking and thickness variation.

Pricing it out

Multiply your tonnage by the per-ton price your local plant or contractor quotes. Installed prices also cover base work, equipment and labor, so material tons are only part of the bid. See asphalt cost per ton for what goes into a quote.

Where asphalt fits

Best suited to:

Driveways, parking pads and private lanes that need a smooth, sealed surface
Overlays on old pavement that is cracked but still structurally sound
Areas where snow will be plowed, since a paved surface does not throw stone

Less suited to:

Ground that stays soft or wet, unless the base and drainage are fixed first
Very small patches, where bagged cold patch is often simpler
Jobs in cold weather, since hot mix needs warm temperatures to compact properly

Quick reference numbers

Per inch over 100 sq ft: about 0.62 tons of asphalt (0.31 cubic yards).
Per inch over 1,000 sq ft: about 6.2 tons.
Another size for comparison: a 14x28 area at 4 inches takes about 9.7 tons.
Weight used here: about 2.0 tons per cubic yard (roughly 145 lb per compacted cubic foot).

Mistakes that throw off the order

Ordering exactly the math. Uneven ground and spillage nearly always need a little more than the flat calculation.
Using inches as if they were feet. Depth has to be divided by 12 before you multiply; skipping that step inflates the order twelvefold.
Measuring only the main rectangle. Aprons, turnouts and curved edges add real square footage.
Ignoring the base. A thin surface layer over soft soil fails early no matter how much material is on top.

Questions people ask

How many tons of asphalt for a 12x70 driveway at 2 inches?

About 10.2 tons of compacted asphalt, or around 10.7 tons with a 5 percent allowance.

How many tons for a 12x70 driveway at 3 inches?

About 15.2 tons at 145 lb per cubic foot.

How many square feet is a 12x70 driveway?

840 square feet, or about 93 square yards.

Does the stone base count in the asphalt tonnage?

No. The base is ordered separately, usually as crushed stone or road base by the ton. The base calculator handles that part.

What density should I use?

About 145 lb per cubic foot is a common planning figure for compacted hot mix. Your plant may give a slightly different number.

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