Mis à jour July 2026

Asphalt Square Footage Calculator

Measure your driveway or lot, choose a paving thickness, and see exactly how many square feet — and tons of hot-mix asphalt — you need to order.

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Utilisée par les propriétaires et les artisans

Unités

Longueur

Largeur

Surface totale

1,938ft²

Mètres carrés

180 m²

Yards carrés

215.3 yd²

Ce que cela signifie

To calculate asphalt square footage, multiply the length by the width of the paved area (length × width), splitting irregular shapes into rectangles and adding them up. To turn that into tonnage, multiply the area by the thickness in feet, then by 145 lb per cubic foot, and divide by 2,000. As a rule of thumb, one ton of hot-mix asphalt covers about 80 square feet at 2 inches thick.

Formule et guide

Comment le calcul est effectué

A driveway or lot is measured as area — length times width in feet. Because hot-mix asphalt is sold by the ton, you then convert that area into tonnage using the paving thickness and the weight of compacted asphalt (about 145 lb per cubic foot).

1Measure the length and width of the paved area in feet and multiply them (length × width) for the square footage.
2Split irregular shapes into rectangles, calculate each one, and add the areas together.
3Convert the thickness to feet (2 in = 0.167 ft, 4 in = 0.333 ft) and multiply: area × thickness × 145.
4Divide that weight in pounds by 2,000 to get the tons of asphalt to order.

Exemple résolu

En chiffres

Driveway (40 ft × 12 ft)	480 sq ft
Thickness (2 in compacted)	0.167 ft
Volume (480 × 0.167)	80 cu ft
Tonnage (80 × 145 ÷ 2,000)	≈ 5.8 tons

480 sq ft driveway at 2 in ≈ 5.8 tons — order about 6 tons of hot-mix asphalt.

Précision et hypothèses

Surface thickness depends on use: 2–3 in for residential driveways, 3–4 in or more for parking lots and heavy traffic.
Asphalt needs a compacted gravel base beneath it — this figure is for the asphalt layer only.
Irregular driveways are split into rectangles; add each rectangle's area for the total.
The 145 lb/cu ft weight and coverage figures assume properly compacted hot-mix asphalt.

Conseils et règles clés

Hot-mix asphalt is ordered by the ton, so square footage plus thickness is what your supplier needs.
Coverage depends on thickness: roughly 80 sq ft per ton at 2 in, about 40 sq ft per ton at 4 in.
A base course of compacted gravel supports the asphalt surface course above it — plan for both layers.
Compacted asphalt weighs about 145 lb per cubic foot, the basis for the tonnage conversion.

Cas d'usage

À qui s'adresse cette calculatrice

Residential driveways

Measure length × width, use 2–3 in of surface asphalt, and convert to tons for a paving quote.

Parking lots

Split the lot into rectangles and use a thicker section (3–4 in+) to handle vehicle loads.

Patching and overlays

Measure just the repair or overlay area, pick the lift thickness, and order the tonnage you need.

How to calculate asphalt square footage for a driveway

Asphalt square footage is the total paved surface area, measured in square feet, and it is the starting point for every paving estimate. For a straight, rectangular driveway the math is simply length times width: a driveway 40 feet long and 12 feet wide is 480 square feet. Because hot-mix asphalt is priced and delivered by the ton rather than the square foot, that area is only half the picture — you also need the paving thickness to work out how much material to order.

Most driveways are not a perfect rectangle. The trick is to break the shape into clean rectangles — the main run, a parking apron, a turnaround — measure each one, and add the areas together. Sketch the driveway from above, note the length and width of each rectangle in feet, and let the calculator above total them for you. Getting the square footage right first means your tonnage and your quote are both built on a solid number.

Turning square footage into tons of asphalt

Once you know the area, converting to tonnage takes two facts: the thickness of the asphalt layer and the weight of compacted hot mix, about 145 pounds per cubic foot. Multiply the area by the thickness in feet to get the volume in cubic feet, multiply by 145 for the weight in pounds, then divide by 2,000 to get tons. A quick rule of thumb skips the math: one ton of asphalt covers roughly 80 square feet at 2 inches thick, or about 40 square feet at 4 inches. So the 480-square-foot driveway at 2 inches needs close to 6 tons.

Remember that asphalt is only the top layer. It is laid over a compacted gravel base that carries the load and drains water away, so budget for both. If you are weighing a paved surface against a poured one, compare the numbers with the concrete alternative before you commit — the base prep is similar but the material costs differ.

Choosing the right thickness for the job

Thickness is what separates a driveway that lasts from one that cracks under load. Residential driveways typically use 2 to 3 inches of surface asphalt over a 4 to 8 inch gravel base. Parking lots, private roads, and anything that sees trucks or constant traffic call for thicker asphalt — often 3 to 4 inches or more, sometimes placed in two lifts. Because tonnage scales directly with thickness, doubling from 2 to 4 inches doubles the asphalt you order for the same square footage.

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FAQ

FAQ de la calculatrice Asphalt

Multiply the length by the width of the paved area in feet (length × width). For an irregular shape, split it into rectangles, calculate each, and add them together. A driveway 40 ft long and 12 ft wide is 480 square feet. That square footage, combined with the paving thickness, is what you use to work out how much asphalt to order.

Multiply the area in square feet by the thickness in feet, then by 145 lb per cubic foot, and divide by 2,000. As a rule of thumb, one ton covers about 80 sq ft at 2 inches or 40 sq ft at 4 inches. A 480 sq ft driveway at 2 inches needs roughly 5.8 tons, so order about 6 tons.

Residential driveways typically use 2 to 3 inches of compacted surface asphalt over a 4 to 8 inch gravel base. Parking lots and areas with heavy or frequent truck traffic need thicker asphalt, often 3 to 4 inches or more. Thickness drives tonnage directly, so confirm it before ordering — a thicker lift means more material.

Take a common 40 ft × 12 ft driveway: that is 480 square feet. At 2 inches thick, the volume is about 80 cubic feet, which at 145 lb per cubic foot works out to roughly 5.8 tons — so you would order about 6 tons of hot-mix asphalt, plus the gravel for the base course underneath.

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