Work out how much asphalt you need for a driveway, parking lot, road or patch. Get volume, weight in tons and tonnes, a waste allowance, truckloads, cost and coverage, with your own thickness and density.
Estimates only. Confirm quantities, depth and mix with your paving contractor or local asphalt plant.
Calculating How Much Asphalt You Need
Asphalt is sold by weight, but you measure the job by area and depth. The calculation takes three steps:
- Find the area. Rectangle: length × width. Circle: π × (diameter ÷ 2)². Triangle: base × height ÷ 2. For odd shapes, split the area into simple pieces and add them up.
- Find the volume. Multiply the area by the compacted thickness. Use the same units, for example feet for both.
- Convert volume to weight. Multiply by the mix density. Standard hot mix is about 145 lb/ft³ (2,322 kg/m³), which works out to roughly 2 tons per cubic yard.
Area = 480 ft². Volume = 480 × (2 ÷ 12) = 80 ft³ ≈ 2.96 yd³.
Weight = 80 × 145 = 11,600 lb = 5.8 tons (5.26 tonnes). Add 5% for waste and you would order about 6.1 tons.
Mistakes that cost money
- Using loose thickness. Our densities are for finished, compacted pavement, so enter the final thickness you want after rolling.
- Forgetting the base. Asphalt sits on a compacted stone base. That aggregate is bought separately and is not part of this estimate.
- Ignoring an uneven subgrade. Low spots soak up extra mix, so keep the waste allowance at 5–10%.
- Mixing up tons and tonnes. They differ by about 10%, see the ton vs tonne section.
- Ordering exactly the calculated amount. Plants often have load minimums, and coming up short means an expensive second delivery.
How Much Area Does One Ton of Asphalt Cover?
Using standard hot mix at 145 lb/ft³, one short ton (2,000 lb) occupies about 13.8 ft³. The area it covers depends only on thickness:
| Compacted thickness | Coverage per ton (sq ft) | Coverage per tonne (sq m) | Tons per 1,000 sq ft |
|---|---|---|---|
| 1.5 in (38 mm) | 110 | 11.3 | 9.1 |
| 2 in (50 mm) | 83 | 8.5 | 12.1 |
| 3 in (75 mm) | 55 | 5.7 | 18.1 |
| 4 in (100 mm) | 41 | 4.2 | 24.2 |
Rounded values for 145 lb/ft³ mix. Your results above use the exact density and depth you enter.
Asphalt Basics and Applications
Asphalt is a dark, sticky petroleum product called bitumen. In paving, the bitumen acts as a binder that glues together sand, gravel and crushed stone (aggregate) to make asphalt concrete, also known as blacktop, tarmac or hot mix asphalt (HMA). It is flexible, waterproof, quick to lay and highly recyclable, since old pavement can be milled up and reused.
The most common uses are:
- Highways, city streets and local roads
- Driveways, car parks and walkways
- Airport runways, racetracks and sports courts
- Cycle paths and playgrounds
- Waterproofing, such as roofing products and pipe coatings
Paving is built in layers: compacted soil, an aggregate base, then one or more asphalt courses (a lower binder course and a final surface course). If you are budgeting a driveway as part of a home purchase or renovation, our House Affordability Calculator helps you see how much room is left in your monthly budget once maintenance costs are included. Buying a worn-out property? An FHA 203(k) renovation loan may be able to fold exterior repairs, including driveway work, into the mortgage; check the payment with the FHA Loan Calculator and confirm eligible items with your lender.
Types of Asphalt
| Type | What it is | Best for |
|---|---|---|
| Hot mix asphalt (HMA) | Dense-graded mix produced and laid hot. The most widely used type, and the density in this calculator matches it. | Roads, driveways, parking lots, all traffic levels |
| Warm mix asphalt (WMA) | Made at lower temperatures than HMA using special additives or foaming. Saves energy and extends the paving season. | Cooler weather, night work, long hauls |
| Driveway mix | Finer, sand-rich mix with smaller stone, giving a smoother surface for light loads. | Residential driveways and light-duty lots |
| Porous (open-graded) asphalt | Little fine material, so water drains through into a stone reservoir below. Lower density, higher cost. | Stormwater control, eco-friendly lots |
| Cold mix | Pre-mixed with additives so it can be placed without heating. Not as strong or durable as hot mix. | Temporary pothole and small patch repairs |
| Stone matrix asphalt (SMA) | Stone-on-stone skeleton with rich binder, very resistant to rutting. | Heavily trafficked highways |
| Recycled asphalt (RAP) | Milled old pavement blended into new mixes or used as base. | Cost-saving bases and sustainable mixes |
Because mixes differ, pick the closest preset above or enter the density from your supplier’s ticket. Properly installed and maintained asphalt often lasts 15–20 years or more, and crack sealing and periodic sealcoating extend that further.
How Thick Should Asphalt Be?
Thickness depends on traffic load and the strength of the base underneath. These are typical compacted ranges, so follow your local specifications and contractor advice:
| Use | Typical compacted thickness |
|---|---|
| Residential driveway (cars) | 2–3 in (50–75 mm) |
| Parking lot, passenger cars | 2–3 in (50–75 mm) |
| Parking lot with delivery trucks | 3–4 in (75–100 mm) |
| Local road or street | 3–4 in (75–100 mm) |
| Overlay on sound pavement | 1.5–2 in (38–50 mm) |
| Industrial or heavy-duty | 4 in and above, placed in several lifts |
As a rule of thumb, each lift should be about two to three times the size of the largest stone in the mix, otherwise it will not compact properly.
Asphalt Calculation: Ton vs Tonne, Tons vs Tonnes
These two units look alike but are not the same, and mixing them up shifts your order by about 10%.
| Unit | Also called | Pounds | Kilograms | Used in |
|---|---|---|---|---|
| Ton | Short ton, US ton | 2,000 lb | 907.185 kg | United States |
| Tonne | Metric ton, metric tonne | 2,204.62 lb | 1,000 kg | Most of the world |
| Long ton | Imperial ton | 2,240 lb | 1,016.05 kg | Historic UK use |
So 10 tons of asphalt is only 9.07 tonnes, and 10 tonnes is 11.02 tons.
Always check which unit your supplier quotes, and compare prices per unit rather than per number. This calculator shows both at once, and the price selector lets you enter a $/ton or $/tonne quote.
Ordering and Cost Tips
- Add 5–10% for waste, trimmed edges and an uneven base.
- Ask the plant about minimum loads, delivery charges and small-job pricing.
- Pave in warm, dry weather. Hot mix cools fast and must be rolled before it stiffens.
- Cost per ton varies by region, mix and season, so get at least two local quotes.
- Have the base prepared and compacted before the truck arrives to avoid wasted mix.
More calculators: House Affordability Calculator · FHA Loan Calculator
Frequently Asked Questions
How many tons of asphalt do I need for a driveway?
A 40 ft × 12 ft driveway at 2 in thick needs about 5.8 tons before waste, or roughly 6 tons with a 5% allowance. A 20 ft × 20 ft pad at 2 in needs about 4.8 tons. Enter your own length, width and depth in the calculator above.
How many square feet does a ton of asphalt cover?
About 83 sq ft at 2 inches thick, 55 sq ft at 3 inches and 41 sq ft at 4 inches, using standard 145 lb/ft³ mix. See the coverage table above.
How thick should an asphalt driveway be?
Most residential driveways are 2–3 inches of compacted asphalt over a well-compacted stone base. Choose 3 inches or more if the driveway will carry heavy vehicles such as RVs or delivery trucks.
How much extra asphalt should I order?
Order 5–10% more than the calculated weight to cover waste, edges and low spots. Many plants also have load minimums, so ask before you place the order.
How much does asphalt cost per ton?
Prices vary widely by region, mix type, fuel costs and delivery distance, so ask local plants or contractors for current quotes. Enter the quoted price in the calculator to see the material cost, then add labor, base preparation and equipment.
What is the difference between a ton and a tonne of asphalt?
A ton (short ton) is 2,000 lb, or 907 kg, and is used in the United States. A tonne is 1,000 kg, or 2,205 lb, and is used elsewhere. A tonne is about 10% heavier, so use the unit your supplier quotes.
How do I calculate asphalt for a circular or irregular area?
Choose the circle or triangle option, or split the area into rectangles and triangles and use the “number of identical areas” field. If you already know the total area from a plan, select “I already know the area”.
How long before I can drive on new asphalt?
In mild weather, light foot traffic is usually fine after about a day and cars after two to three days. In hot weather it takes longer, and asphalt keeps hardening for months, so avoid sharp turning of parked vehicles and heavy loads at first.
Disclaimer: For general estimating only. Densities, depths and drying times vary with the mix and conditions. Follow your contractor’s specifications.