How Many Tons of Asphalt for a 20x100 Driveway?

How many tons of asphalt for a 20x100 driveway: plan on about 24.2 tons at 2 inches compacted or 36.2 tons at 3 inches. Those figures come from 2,000 square feet of surface and a typical compacted density near 145 lb per cubic foot. Your plant’s mix design may run a little heavier or lighter.

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Step-by-step math for 20x100

Area: 20 ft × 100 ft = 2,000 sq ft.
Thickness in feet: 3 inches ÷ 12 = 0.25 ft.
Volume: 2,000 × 0.25 = 500 cubic feet.
Weight: 500 × 145 lb = 72,500 lb.
Tons: divide by 2,000 = 36.2 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	333	24.2	25.4
2.5 in	417	30.2	31.7
3 in	500	36.2	38.1
4 in	667	48.3	50.8

What thickness fits this job

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 36.2 tons at 3 inches, figure roughly 3 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.

When to choose asphalt

Good uses:

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

Poor fit for:

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 12x24 area at 3 inches takes about 5.3 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.
Forgetting that compaction shrinks loose material. A loose 4-inch spread of a dense-graded stone may finish closer to 3 inches after rolling.
Mixing up cubic yards and tons. Yards are volume, tons are weight; convert with the product’s weight per yard.
Skipping drainage. Water sitting under any surface softens the base and leads to ruts and potholes.

Questions people ask

How many tons of asphalt for a 20x100 driveway at 2 inches?

About 24.2 tons of compacted asphalt, or around 25.4 tons with a 5 percent allowance.

How many tons for a 20x100 driveway at 3 inches?

About 36.2 tons at 145 lb per cubic foot.

How many square feet is a 20x100 driveway?

2,000 square feet, or about 222 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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