How Many Tons of Asphalt for a 28x120 Parking Area?

A 28 by 120 foot parking area covers 3,360 square feet. How many tons of asphalt for a 28x120 parking area depends mostly on the finished thickness: about 40.6 tons for a 2-inch overlay and about 60.9 tons for a 3-inch new surface, figured at roughly 145 lb per compacted cubic foot.

Asphalt tonnage calculator →

Step-by-step math for 28x120

Area: 28 ft × 120 ft = 3,360 sq ft.
Thickness in feet: 3 inches ÷ 12 = 0.25 ft.
Volume: 3,360 × 0.25 = 840 cubic feet.
Weight: 840 × 145 lb = 121,800 lb.
Tons: divide by 2,000 = 60.9 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	560	40.6	42.6
2.5 in	700	50.8	53.3
3 in	840	60.9	63.9
4 in	1,120	81.2	85.3

Choosing a thickness

Residential parking areas are commonly paved at 2 to 3 inches of compacted surface over a compacted stone base. Overlays on sound old pavement are often 1.5 to 2 inches. If heavy trucks, an RV or a delivery vehicle will use the parking area, many contractors step up to 3 or 4 inches total, sometimes as a binder course plus a surface course.

Ordering and trucks

Hot mix is sold by the ton and arrives in dump trucks that commonly haul 10 to 20 tons each. For 60.9 tons at 3 inches, figure roughly 5 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.

Good and poor uses for asphalt

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 10x20 area at 4 inches takes about 4.9 tons.
Weight used here: about 2.0 tons per cubic yard (roughly 145 lb per compacted cubic foot).

Mistakes that throw off the order

Forgetting that compaction shrinks loose material. A loose 4-inch spread of a dense-graded stone may finish closer to 3 inches after rolling.
Ignoring the base. A thin surface layer over soft soil fails early no matter how much material is on top.
Using inches as if they were feet. Depth has to be divided by 12 before you multiply; skipping that step inflates the order twelvefold.
Ordering exactly the math. Uneven ground and spillage nearly always need a little more than the flat calculation.

Questions people ask

How many tons of asphalt for a 28x120 parking area at 2 inches?

About 40.6 tons of compacted asphalt, or around 42.6 tons with a 5 percent allowance.

How many tons for a 28x120 parking area at 3 inches?

About 60.9 tons at 145 lb per cubic foot.

How many square feet is a 28x120 parking area?

3,360 square feet, or about 373 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.

As an Amazon Associate, AsphaltTons.com earns from qualifying purchases. Product links below are sponsored.