ConstructionCalc

Asphalt Calculator: Tons, Cubic Yards & Base

Enter the area and thickness to get hot-mix asphalt in tons, the way it is sold, plus cubic yards, the base under it, and how far a ton spreads.

By Marko VisicBSc Physics, University of Ljubljana

7.25tons

US tons of asphalt at 145 lb/ft³ (Iowa DOT)

one ton covers about 83 sq ft

1 yd³+0.7 yd³3 ft3 ft3 ft
The same order by volume, in cubic-yard boxes.
Metric tons
6.58 t
Pounds
14,500 lb
Cubic yards
3.7 yd³
Cubic feet
100 ft³

Asphalt is sold by the ton, so this is the number to order.

Next: convert cubic yards to tons, size the gravel base, or compare concrete vs asphalt for a driveway.

Area
Units
Driveway range (WisDOT detail).
No public price per ton of asphalt exists. Enter your supplier's quote for a total.

Order 7.25 tons of asphalt

A 50 by 12 ft driveway at 2 inches of hot-mix asphalt comes to about 7.25 tons at 145 lb/ft³, the density Iowa DOT estimates with. Asphalt is sold by the ton, so order tons, not yards: one cubic yard is about 1.96 tons, and one ton covers roughly 83 square feet at this thickness.

Need to go the other way or size the layer underneath? Use the cubic yards to tons converter or the gravel calculator for the base, and compare surfaces in concrete vs asphalt for a driveway.

Estimate only: tonnage uses a DOT estimating density and varies with the mix and compaction. Confirm the quantity and price with your supplier before ordering.

What you measure

An asphalt estimate needs three things: the area to pave, the compacted thickness, and the density the tonnage is figured at. The cross-section shows how the asphalt sits on its base.

Asphalt driveway — section

Area

Measure length and width in feet, or switch to a circle, or type the square footage straight in. Break an odd shape into rectangles and add them.

Thickness

The compacted depth of the asphalt in inches. A state DOT driveway detail shows 2 to 3 inches of asphalt over the base; design sets the final thickness for the load.

Density

The calculator defaults to the Iowa DOT estimating density of 145 lb/ft³. You can switch to the Kentucky spread-rate rule or enter your own.

How to calculate asphalt tonnage

Asphalt is bought by weight, so the useful answer is tons, not volume. The asphalt formula is the same every time: turn area and thickness into cubic feet, multiply by the density, and divide by 2,000. That is all the asphalt ton calculator above is doing as you type.

The asphalt formula

tons = area × [thickness ÷ 12] × 145 ÷ 2,000

The density is the Iowa DOT estimating value for hot-mix asphalt, 145 lb/ft³; the Federal Highway Administration lists a close 145.2 lb/ft³.

The spread-rate method

Some DOTs estimate by spread rate instead. Kentucky uses 110 lb per square yard per inch, which works out to about 146.7 lb/ft³, roughly one percent heavier. The calculator offers both.

Hot mix asphalt, worked through

A 50 × 12 ft driveway, 2 inches of hot-mix asphalt:

50 × 12 = 600 ft²
600 × (2 ÷ 12) = 100 ft³
100 × 145 ÷ 2,000 = 7.25 tons

Switch the density method or thickness in the calculator to see the tonnage change.

Square yards and cubic yards to tons

Paving is often quoted in square yards or cubic yards. One cubic yard of compacted asphalt is about 1.96 tons at 145 lb/ft³. To go from square yards, multiply by the thickness: each square yard one inch deep weighs about 108.75 pounds, so a ton covers a predictable area.

At the Iowa DOT estimating density of 145 lb/ft³. Coverage is the inverse of tonnage per square foot.
ThicknessTons per 1,000 sq ftSq ft per ton
2 inches12.0883
3 inches18.1355
4 inches24.1741
One ton of asphalt, spread

Blacktop and black top pavement

Blacktop is another name for asphalt pavement, so a blacktop calculator and an asphalt calculator are the same tool: black top pavement is the same hot-mix asphalt, figured at the same density and sold by the same ton. Use the calculator above for a blacktop driveway, parking area or patch exactly as you would for asphalt.

How thick is an asphalt driveway?

A state DOT driveway detail shows 2 to 3 inches of asphalt over a compacted aggregate base, with a note that the design sets the final thickness for the usage and loading. Treat that as a starting range for a residential drive, not a code requirement, and let an engineer or paver confirm the build for heavy loads.

The base under the asphalt

Asphalt rides on compacted stone. The same DOT detail puts about 6 inches of dense aggregate base under the surface, and the Federal Highway Administration lists that base at 139.0 lb/ft³. Turn the base layer on in the calculator to get its tonnage, or size it on its own with the gravel calculator.

Worked example: a driveway end to end

A 12 by 50 ft driveway is 600 square feet. At 2 inches of asphalt that is about 7.25 tons; at 3 inches, about 10.88 tons. Add a 6-inch aggregate base and that base is about 20.85 tons at 139.0 lb/ft³. All three figures come straight from the calculator.

How much does asphalt cost?

No public source publishes a national all-in price per ton of asphalt, so enter your supplier's price for a cost line. What BLS does publish is a producer price index for asphalt paving mixtures, which shows how the price has moved.

Asphalt paving mixture price index

+16.9% on its 2022 average

Year over year the index is +7.8%. The latest reading is 448.167 (BLS series PCU324121324121, Jun 1981 = 100). This index uses the October 2026 producer price index from BLS, the most recent month FRED publishes, read live from FRED. FRED last refreshed this series on Nov 13, 2026.

Asphalt calculator FAQ

How much asphalt do I need for a 2,000-square-foot driveway?

About 24.2 tons of hot-mix asphalt at 2 inches, using the Iowa DOT estimating density of 145 lb/ft³. At 3 inches it is half again as much. Enter your own area and thickness above for the exact tonnage.

How many tons of asphalt are in a cubic yard?

About 1.96 tons at 145 lb/ft³. The Federal Highway Administration lists a close 145.2 lb/ft³, so the two agree.

How many square feet does a ton of asphalt cover?

About 83 square feet at 2 inches and about 55 square feet at 3 inches. Thicker asphalt covers less ground per ton.

How do you calculate tons of asphalt?

Multiply the area in square feet by the thickness in feet (thickness in inches divided by 12) for cubic feet, multiply by the density of 145 lb/ft³, then divide by 2,000 for tons. The calculator above does it as you type.

How much does a ton of asphalt cost?

No public source publishes a national all-in price per ton, so enter your supplier's price for a cost line. The BLS producer price index for asphalt paving mixtures has changed +16.9% from its 2022 average.

Sources

  1. Iowa Department of Transportation. Design Manual, Chapter 1, 1B-4: Densities for Use in Estimating Quantities, Table 1: HMA Densities. Revised 5/21/2026 ('New 2026 Update')
  2. Federal Highway Administration (FHWA), Office of Federal Lands Highway. Application Rates and Weights for Estimating Purposes (design tools table). file stamp Sep 18, 2009
  3. Kentucky Transportation Cabinet. Proposal, Call No. 306, Contract ID 231342 (Jefferson County), Addendum 1 — "Asphalt Mixture" note. Oct 13, 2023
  4. Wisconsin Department of Transportation. Standard Detail Drawing 9A15, Driveways without Curb & Gutter, Resurfacing Projects, Rural (November 2025). Nov 2025
  5. U.S. Bureau of Labor Statistics, via FRED (Federal Reserve Bank of St. Louis). FRED series PCU324121324121, Producer Price Index by Industry: Asphalt Paving Mixture and Block Manufacturing (Index Jun 1981=100, monthly, NSA), table data.