How do you calculate asphalt tonnage?
Asphalt is ordered by weight, but you measure a driveway by area and thickness, so the calculation is: area × thickness = volume, then volume × density = weight. The density of compacted hot-mix asphalt is about 2.4 tonnes per cubic metre (roughly 145 lb per cubic foot, or about 2 tons per cubic yard at typical depths). The calculator does the unit juggling for you and returns tons directly from your measurements.
How thick should an asphalt driveway be?
For a residential driveway, a common build is 2–3 inches (5–7.5 cm) of asphalt over a compacted stone base. Light traffic can sit at 2 inches; if trucks or heavy vehicles will use it, go to 3 inches or more, and make sure the base is right — most asphalt failures come from a weak base, not thin asphalt. Enter your planned compacted thickness and the calculator sizes the order to match.
Why order extra asphalt?
Always add a waste allowance, usually 5–10%. Some mix is lost to compaction, uneven sub-grade, the edges, and material that cools before it's laid. Asphalt also can't be ordered in tiny top-ups — a plant has a minimum load and it cools fast — so it's better to have a little spare than to come up short mid-pour. The calculator adds a configurable margin so your delivered tonnage isn't tight.
Tons, area and thickness: getting the units right
The number-one source of error is mixing units — feet with inches, or metres with centimetres. Thickness is small (inches or centimetres) while length and width are large (feet or metres), so they have to be converted to the same base before multiplying. Order also depends on whether you mean compacted or loose thickness; the finished, compacted depth is what matters. The calculator keeps the units consistent and works in either imperial or metric.
Reference tool. Uses a typical compacted-asphalt density; confirm mix density, thickness and price with your supplier or paver before ordering.
Frequently asked questions
How many tons of asphalt do I need?
Multiply area by compacted thickness to get volume, then by about 2.4 t/m³ (roughly 2 tons per cubic yard). For example, 100 m² at 5 cm is about 12 tonnes. Enter your figures above for an exact number.
How thick should a driveway be?
2–3 inches (5–7.5 cm) of asphalt over a solid compacted base for a home driveway; 3 inches or more where heavier vehicles run.
How much does a ton of asphalt cover?
At 2 inches thick, one ton covers roughly 80 sq ft (about 7.5 m²). Thicker means less coverage per ton — at 3 inches it's closer to 55 sq ft.
What is the density of asphalt?
Compacted hot-mix asphalt is about 2.4 tonnes per cubic metre, ~145 lb/ft³, or roughly 2 tons per cubic yard.
How much extra should I order?
Add 5–10% for compaction, edges and cooling losses, and to clear the plant's minimum load. The calculator includes a waste margin.