Free tool
Asphalt tonnage calculator
Enter the area, depth and density for each layer to see the tonnes to order and the number of truck loads. Free, no sign-up.
Total
| Layer | Laid | Wastage | To order | Loads |
|---|---|---|---|---|
| All layers | 0.0 t | 0.0 t | 0.0 t | 0 |
Tonnes = area × depth ÷ 1,000 × density. To order = laid tonnes plus wastage, rounded up to 0.1 t. Loads = to order ÷ truck payload, rounded up. This is arithmetic on the numbers above, not advice on mix design, thickness or compaction. Check the density with your supplier or the mix design.
How it is worked out
Tonnes = area × depth ÷ 1,000 × density. Depth is in millimetres, density in tonnes per cubic metre. Wastage is added as a percentage, and the result is rounded up to 0.1 of a tonne.
Worked example: 1,000 m² of AC14 at 40 mm and 2.4 t/m³ is 96 t laid. With 5% wastage that is 100.8 t to order.
How far does one tonne go? At 2.4 t/m³:
| Compacted depth | Area per tonne |
|---|---|
| 25 mm | 16.7 m² |
| 30 mm | 13.9 m² |
| 40 mm | 10.4 m² |
| 50 mm | 8.3 m² |
| 75 mm | 5.6 m² |
These are estimates from the figures you enter. Check them against your specification and your supplier.
Want this on every job, without retyping?
Korvo fills in areas from your contract items, adds the tonnes to the job's budget, and checks delivered tonnes against laid. Leave your details and we will show you.
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Common questions
- How do I calculate how many tonnes of asphalt I need?
- Multiply the area in square metres by the compacted depth in metres to get the volume, then multiply by the density in tonnes per cubic metre. For 1,000 m² at 40 mm and 2.4 t/m³ that is 1,000 × 0.04 × 2.4 = 96 tonnes laid. Add an allowance for wastage on top.
- What density should I use for asphalt?
- This calculator starts at 2.4 t/m³, a common starting point for compacted dense graded asphalt. The right figure depends on the mix design and how it is compacted, so use the density from your mix design or supplier if you have it.
- How much wastage should I allow?
- It starts at 5%, which covers trimming, uneven subgrade and material left in the paver and trucks. Small, patchy or awkward jobs usually need more than large, simple ones, so change it to suit the job.
- How many truck loads is that?
- Divide the tonnes to order by the payload of your trucks. The calculator uses 20 tonnes as a starting point and rounds up to whole loads. Change the payload to match the trucks you will actually use.
- Can I work out more than one layer?
- Yes. Add a layer for each mix, for example a base course and a wearing course. Each is worked out separately and the totals are added up.
- Is this accurate enough to order from?
- It is arithmetic on the numbers you enter, so it is only as good as the area, depth and density you give it. Treat it as an estimate, and check the figures against your specification and your supplier before ordering.
Do this on every job, automatically
Korvo works out materials from your contract items, reads tenders and dockets from PDFs, and checks delivered against laid tonnes.