How do you calculate how much asphalt you need?

Multiply length by width by thickness in feet to get cubic feet, multiply that by the mix density in pounds per cubic foot, then divide by 2,000 for tons. A 50 ft × 12 ft driveway at 3 inches works out to 150 × 145 ÷ 2000 = 10.88 tons.

How many square feet does a ton of asphalt cover?

About 165 sq ft at 1 inch thick, 83 sq ft at 2 inches, 55 sq ft at 3 inches and 41 sq ft at 4 inches. One ton of standard hot mix is roughly 13.8 cubic feet of compacted material, so coverage halves each time you double the thickness.

How thick should an asphalt driveway be?

Two to three inches of compacted surface course over a 4 to 8 inch compacted aggregate base for a residential driveway. Commercial lots that see delivery trucks want 3 to 4 inches, and roads carrying heavy traffic run 4 to 6 inches, usually in two lifts.

How much does a ton of asphalt cost?

Hot mix typically runs $100 to $150 per ton at the plant in the US, with wide regional swings tied to oil prices. Installed, including base prep, compaction and labour, expect roughly $3 to $7 per square foot. Enter your own quoted price above for a real figure.

What is the density of asphalt?

Standard compacted hot mix is about 145 pounds per cubic foot, which is 2,322 kg per cubic metre. Binder course runs slightly heavier at around 148, recycled asphalt about 140, and open-graded porous mixes as low as 130 because of the void space designed into them.

Should I order extra asphalt?

Add 5 to 10 percent. Paving crews lose material to the screed, to edge feathering, and to the thickness varying over an uneven base. Unlike concrete, leftover hot mix cools and cannot be kept, so the sensible margin is small but real.

Does the calculator give compacted or loose tonnage?

Compacted. Enter the finished thickness you want after rolling, not the loose depth the paver lays down. Loose hot mix compacts by roughly 20 to 25 percent, so a 3-inch finished surface is laid at close to 3.75 inches.

Asphalt Calculator: Tons Needed for a Driveway or Lot

Asphalt is quoted by the ton, laid by the inch and measured by the foot, so ordering it means running a small chain of conversions before you can pick up the phone. Get the thickness wrong by half an inch on a driveway and you are a ton out, which is real money and — worse — a load that cannot be sent back once it has left the plant hot.

Asphalt Calculator formula — The Asphalt formula

The asphalt tonnage formula

and are the paved length and width in feet, is the compacted thickness in inches, is the mix density in pounds per cubic foot, and 2,000 converts pounds to US short tons.

The three moving parts are worth separating, because each one trips people up differently:

Term	What it is	Usual value
	thickness converted from inches to feet	3 in → 0.25 ft
	unit weight of the compacted mix	145 lb/cu ft
2000	pounds in a US short ton	fixed

Worked example

A residential driveway, 50 ft long and 12 ft wide, finished at 3 inches of standard hot mix.

Step 1 — convert the thickness to feet.

Step 2 — get the compacted volume in cubic feet.

Step 3 — multiply by density for the weight in pounds.

Step 4 — divide by 2,000 for tons.

At $120 a ton that is $1,305 in material. Add the usual 5 to 10 percent for screed loss and edge feathering and you would order 11.5 tons.

The same job in cubic yards is cu yd, which is worth knowing if your supplier prices by volume rather than weight.

Asphalt Calculator worked example diagram — A visual read of the worked example above — the same numbers the calculator returns for its default inputs.

Coverage per ton

One ton of 145 lb/cu ft hot mix is cubic feet of compacted material. Spread that over a thickness and you get the coverage:

Compacted thickness	One ton covers
1 in	165 sq ft
1.5 in	110 sq ft
2 in	83 sq ft
2.5 in	66 sq ft
3 in	55 sq ft
4 in	41 sq ft
6 in	28 sq ft

The quick field rule is 165 divided by the thickness in inches. It is close enough for a phone call and only drifts if you are running an unusual mix density.

How thick should it be?

Application	Compacted asphalt	Aggregate base under it
Residential driveway	2–3 in	4–8 in
Heavy residential (RV, boat)	3 in	8 in
Commercial parking, cars only	3 in	6–8 in
Commercial with truck traffic	4 in, two lifts	8–12 in
Local road	4–6 in, two lifts	12 in

The base matters more than most people expect. Asphalt is a flexible pavement — it spreads load rather than bridging it the way a concrete slab does, so it is only ever as good as what is underneath. Paving three inches over a soft or poorly compacted subgrade buys you a driveway that cracks in its second winter. If the base is questionable, the money is better spent there than on an extra inch of surface. The gravel calculator handles the base tonnage.

Compacted versus loose thickness

This is the single most common error on a first driveway, and it goes in the expensive direction.

Hot mix arrives loose and is compacted by the roller to roughly 75 to 80 percent of its laid depth. So a finished 3-inch surface is screeded at close to 3.75 inches:

Enter the compacted thickness in this calculator, not the loose one. The density figure of 145 lb/cu ft already describes the material after rolling. If you enter the loose depth as well, you double-count the compaction and over-order by about a quarter.

Mix types and why the density differs

Mix	Density (lb/cu ft)	Where it is used
Surface course (HMA)	145	the visible top layer
Dense-graded binder	148	the structural lift under the surface
Recycled asphalt (RAP)	140	driveways, base repair, budget work
Open-graded / porous	130	drainage-critical lots, some roads
Cold mix patch	135	pothole repair, winter work

Open-graded mixes weigh less because the voids are deliberate — water is meant to pass through. That means a porous lot of the same size and thickness needs roughly 10 percent less tonnage than a dense-graded one, which is easy to miss when you reuse a number from a previous job.

What the tonnage does not include

Base and sub-base. Priced and ordered separately, usually by the ton as well.

Tack coat. The bituminous bond between lifts or against an existing surface. Sold by the gallon, roughly 0.05 to 0.10 gal per square yard.

Compaction and labour. Typically the larger half of an installed quote. Material at $120 a ton on a 600 sq ft driveway is around $1,300; the installed price for that job is usually $2,500 to $4,000.

Edge and transition material. Feathering into a garage apron or a street tie-in eats mix that the rectangle calculation does not see. It is part of why the 5 to 10 percent margin exists.

Common mistakes

Entering the loose depth. Use the compacted thickness. The density already accounts for rolling.
Dividing thickness by 3 instead of 12. Inches to feet is 12. It is the same slip that turns square feet into nonsense.
Reusing 145 lb/cu ft for a porous mix. Open-graded runs near 130, and the 10 percent gap shows up on a big lot.
Forgetting the base. Asphalt over an uncompacted subgrade fails early regardless of how thick the surface is.
Ordering the exact figure. Add 5 to 10 percent. Leftover hot mix cannot be stored, but running short mid-pave leaves a cold joint across the drive.
Confusing short tons with metric tonnes. This calculator uses US short tons of 2,000 lb. A metric tonne is 2,205 lb, about 10 percent more.

Once the surface tonnage is settled, the cubic yard calculator converts the same volume for suppliers who quote by yard, and the square footage calculator handles the area if the drive is anything other than a plain rectangle.

About the formula: Tons = (Length × Width × Thickness ÷ 12) × Density ÷ 2000. Thickness is the compacted depth in inches, and density is the mix's unit weight in pounds per cubic foot.

Asphalt Calculator