Asphalt Tonnage Calculator — How Many Tons Do I Need?
Enter your area and compacted thickness and this calculator returns the tonnage to order in US short tons, metric tonnes and cubic yards, using the correct density for your mix type rather than assuming 145 lb/ft³ for everything.
Asphalt tonnage calculator
This calculator is built for one job: producing a tonnage figure you can hand to a supplier. It defaults to showing tonnage prominently, outputs short tons, metric tonnes and cubic yards simultaneously, and tells you how many truck loads that represents.
Tonnage by project size
Dense-graded hot mix at 145 lb/ft³, before any waste buffer. Multiply by 1.10 for the figure to actually order.
| Area | 2" thick | 3" thick | 4" thick | 6" thick |
|---|---|---|---|---|
| 250 sq ft | 3.0 t | 4.5 t | 6.0 t | 9.1 t |
| 500 sq ft | 6.0 t | 9.1 t | 12.1 t | 18.1 t |
| 600 sq ft | 7.2 t | 10.9 t | 14.5 t | 21.8 t |
| 1,000 sq ft | 12.1 t | 18.1 t | 24.2 t | 36.2 t |
| 2,000 sq ft | 24.2 t | 36.2 t | 48.3 t | 72.5 t |
| 5,000 sq ft | 60.4 t | 90.6 t | 120.8 t | 181.2 t |
| 10,000 sq ft | 120.8 t | 181.2 t | 241.7 t | 362.5 t |
| 20,000 sq ft | 241.7 t | 362.5 t | 483.3 t | 725.0 t |
How tonnage is calculated
- Volume: area × compacted thickness, with both in the same units.
- Weight: volume × the density of your specific mix.
- Tonnage: divide pounds by 2,000 or kilograms by 1,000.
- Order quantity: add the waste and compaction buffer, round up.
Tonnes = Area (m²) × Thickness (m) × Density (kg/m³) ÷ 1,000
The full derivation, worked examples in both unit systems and the shortcut constants are in the how to calculate asphalt guide.
How mix type changes your tonnage
This is the part most tonnage calculators get wrong. The same volume of different asphalt mixes weighs very different amounts, and if you order against the wrong density you will be short or long by a margin no buffer covers.
| Mix | Density | Tonnage for 5,000 sq ft at 3 in | vs dense HMA | Cost impact at $130/t |
|---|---|---|---|---|
| Porous asphalt | 100 lb/ft³ | 62.5 t | −31% | −$3,656 |
| Open-graded friction course | 115 lb/ft³ | 71.9 t | −21% | −$2,438 |
| RAP millings | 125 lb/ft³ | 78.1 t | −14% | −$1,625 |
| Cold mix | 140 lb/ft³ | 87.5 t | −3% | −$406 |
| Dense-graded HMA | 145 lb/ft³ | 90.6 t | baseline | — |
| DBM | 148 lb/ft³ | 92.5 t | +2% | +$244 |
| SMA | 150 lb/ft³ | 93.8 t | +3% | +$406 |
| EME 2 | 152 lb/ft³ | 95.0 t | +5% | +$569 |
Select your mix in the dropdown above and the density updates automatically. The full reference is in the density guide.
Tons, tonnes and cubic yards
Three units, three different numbers for the same pile of asphalt.
| Unit | Definition | Where it is used | Conversion |
|---|---|---|---|
| US short ton | 2,000 lb / 907.2 kg | United States, Canada, Philippines | × 0.9072 = tonnes |
| Metric tonne | 1,000 kg / 2,204.6 lb | Europe, Asia, Africa, Australia | × 1.1023 = short tons |
| Long ton | 2,240 lb / 1,016 kg | Rare, some legacy UK contracts | × 1.12 = short tons |
| Cubic yard | 27 ft³ / 0.7646 m³ | US suppliers of millings and base stone | × 1.96 = tons of HMA |
| Cubic metre | 1 m³ / 35.31 ft³ | Metric volume quotes | × 2.3227 = tonnes of HMA |
The calculator shows all of these at once, so a quote in cubic yards and a quote in tonnes can be compared directly.
The waste and compaction buffer
Loose mix behind the paver occupies about 20% more volume than the compacted pavement. Add edge trimming, truck-bed residue and measurement tolerance, and 10% is the standard allowance on ordinary work.
| Site | Buffer | Why |
|---|---|---|
| Machine-laid rectangle, experienced crew | 5% | Minimal trimming and predictable compaction |
| Standard driveway or lot | 10% | Normal edges, some hand work at the perimeter |
| Curved edges or several sections | 15% | More offcuts and more hand placement |
| Millings or cold mix | 15–20% | Higher compaction loss, less predictable spread |
Delivery and truck loads
Asphalt is delivered hot and has to be placed before it cools below about 185 °F, so delivery is scheduled tightly around the paving operation rather than dropped off in advance.
| Vehicle | Typical payload | Best for |
|---|---|---|
| Six-wheel dump truck | 10–12 tons | Small driveways, tight access, low overhead clearance |
| Tri-axle dump truck | 18–22 tons | The default for most residential and light commercial work |
| Quad-axle dump | 22–26 tons | Larger lots where access allows |
| Live-bottom trailer | 22–25 tons | Continuous feed to a paver, minimal segregation |
| Transfer vehicle (MTV) | 25+ tons | Highway paving, remixes to eliminate segregation |
Two practical points. Most plants have a minimum order of 1–3 tons and add a small-load surcharge below about 5 tons, so a 3-ton patch may cost more per ton than a 20-ton job. And a tail load of 1–2 tons is common — it is often worth nudging the thickness up slightly to fill the last truck rather than paying for a nearly empty one.
Placing the order
Have this list ready before you call:
- Tonnage including buffer, rounded up to the nearest half ton
- The plant's mix designation, or the DOT specification number — "asphalt" is not an order
- Delivery date and a time window the crew can actually meet
- Site access: gate width, turning radius, overhead cables, ground bearing capacity
- Discharge method: into the paver, into a transfer vehicle, or tipped for hand work
- Whether tack coat and prime coat are included or supplied separately
- The plant's minimum order and small-load fee
Tonnage mistakes that cost money
- Forgetting to divide inches by twelve.
- Using the loose mat thickness instead of the compacted design thickness.
- Confusing short tons with metric tonnes — a 10% error either way.
- Applying 145 lb/ft³ to millings, porous asphalt or open-graded mix.
- Calculating a layered structure as one combined thickness at one density.
- Measuring the excavation rather than the finished pavement.
- Rounding down. A short order means a cold joint and a second mobilisation charge.
Frequently asked questions
How many tons of asphalt do I need?
Multiply the area in square feet by the compacted thickness in inches, divide by 12, multiply by 145 and divide by 2,000. A 1,000 sq ft driveway at 2 inches needs 12.08 tons, or 13.3 tons with a 10% buffer.
How much does a ton of asphalt cover?
About 81 sq ft at 2 inches, 54 sq ft at 3 inches and 40 sq ft at 4 inches for dense-graded hot mix. Lighter mixes cover more ground per ton.
What is the difference between a ton and a tonne?
A US short ton is 2,000 lb (907.2 kg). A metric tonne is 1,000 kg (2,204.6 lb). A tonne is about 10% heavier. Suppliers in the US, Canada and the Philippines quote short tons; most of the rest of the world quotes tonnes.
How do I calculate tonnage for a multi-layer pavement?
Calculate each lift separately, because each has its own thickness, mix type and density. Add one area entry per lift in the calculator above and it returns per-layer and combined totals.
How many tons fit on a delivery truck?
A six-wheel dump truck carries 10–12 tons, a tri-axle 18–22 tons and a live-bottom trailer 22–25 tons. The calculator assumes 20-ton loads and shows how many you need plus the size of the tail load.
Do I order the calculated tonnage or more?
More. Add 5% for a simple machine-laid rectangle, 10% for a standard driveway or lot and 15% for curved or hand-worked sites, then round up to the nearest half ton.
Why does my contractor's tonnage differ from this calculator?
Usually one of three things: a different assumed density, a different waste buffer, or they are including the aggregate base tonnage in the same figure. Ask which mix and which density they used — that resolves it most of the time.
Can I use this for asphalt millings?
Yes — select RAP millings from the mix dropdown and the density drops to 125 lb/ft³, which is the correct value. There is also a dedicated millings calculator with RAP-specific pricing and compaction guidance.
Sources and further reading
Related calculators and guides
Density guide
The density behind every tonnage figure.