How Many Tons of Asphalt for a 20x45 Driveway?

How many tons of asphalt for a 20x45 driveway: plan on about 10.9 tons at 2 inches compacted or 16.3 tons at 3 inches. Those figures come from 900 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 20x45

Area: 20 ft × 45 ft = 900 sq ft.
Thickness in feet: 3 inches ÷ 12 = 0.25 ft.
Volume: 900 × 0.25 = 225 cubic feet.
Weight: 225 × 145 lb = 32,625 lb.
Tons: divide by 2,000 = 16.3 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	150	10.9	11.4
2.5 in	188	13.6	14.3
3 in	225	16.3	17.1
4 in	300	21.8	22.8

What thickness fits this job

Thickness is set by traffic and base. Cars on a well-compacted base get by with 2 to 3 inches. A driveway that sees heavy deliveries or sits on soft soil needs more, either thicker asphalt or a deeper base, and a contractor may split it into two lifts.

Ordering and trucks

Hot mix is sold by the ton and arrives in dump trucks that commonly haul 10 to 20 tons each. For 16.3 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

Works well for:

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

Think twice 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 8x16 area at 3 inches takes about 2.4 tons.
Weight used here: about 2.0 tons per cubic yard (roughly 145 lb per compacted cubic foot).

Common estimating mistakes

Assuming every supplier uses the same weight. Two yards selling the same product name can quote different tons per yard.
Ignoring the base. A thin surface layer over soft soil fails early no matter how much material is on top.
Measuring only the main rectangle. Aprons, turnouts and curved edges add real square footage.
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 20x45 driveway at 2 inches?

About 10.9 tons of compacted asphalt, or around 11.4 tons with a 5 percent allowance.

How many tons for a 20x45 driveway at 3 inches?

About 16.3 tons at 145 lb per cubic foot.

How many square feet is a 20x45 driveway?

900 square feet, or about 100 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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