The short answer
You need three things: the paved area, the finished compacted asphalt depth and a density appropriate to the mix being ordered. Multiply area by depth to get compacted volume, then multiply that volume by density to get mass.
For a quick project estimate, enter those measurements in the Asphalt Calculator. It shows the raw requirement separately from the ordering allowance and purchase rounding so you can see exactly how the final quantity was reached.
Asphalt tonnage formula
Compacted volume = paved area × compacted depthAsphalt mass = compacted volume × asphalt densityOrder quantity = raw asphalt mass + chosen allowance, rounded to the supplier's purchase incrementThe units must be consistent. In US customary units, convert inches of depth to feet before multiplying by square feet. In metric, convert millimetres to metres before multiplying by square metres.
Worked example: 1,000 sq ft at 3 inches
Suppose a project covers 1,000 square feet and the specified finished compacted depth is 3 inches. The engine-normalized depth is 0.25 ft, so the compacted volume is 250 cubic feet.
JobsiteMeasure’s current asphalt calculator uses an editable planning density of 146.7 lb/ft³, equivalent to 2,350 kg/m³. That density is derived from the Minnesota Asphalt Pavement Association calculator value of 110 lb per square-yard-inch.
1,000 ft² × 0.25 ft = 250 ft³250 ft³ × 146.7 lb/ft³ ≈ 36,676 lb36,676 lb ÷ 2,000 ≈ 18.3 US short tonsThe raw result is the theoretical compacted requirement before any project-specific allowance or supplier rounding. The stages below keep those later ordering decisions visible.
1,000 ft² at 3 in: four distinct stages at 146.7 lb/ft³
- Raw tonnage
- 18.34 US tons Compacted geometric requirement
- With 5% contingency
- 19.26 US tons Before purchase rounding
- Supplier-rounded order
- 19.3 US tons Existing 0.1-ton planning increment
- Truckload equivalent
- 0.97 loads Based on the rounded order and 20-ton editable truck capacity
How depth changes the amount of asphalt
Tonnage rises directly with compacted depth when area and density stay the same. The generated tables below show raw tons and a separate 5%-adjusted planning quantity at common depths and driveway dimensions.
Depth should come from the project specification or qualified design rather than from a calculator default.
Asphalt coverage by compacted depth
All values are raw quantity before contingency, supplier rounding, or truckload planning.
| Compacted depth | lb / ft² | ft² / US ton | Tons / 100 ft² | Tons / 500 ft² | Tons / 1,000 ft² |
|---|---|---|---|---|---|
| 1.5 in | 18.3 | 109.1 | 0.92 | 4.58 | 9.17 |
| 2.0 in | 24.5 | 81.8 | 1.22 | 6.11 | 12.23 |
| 2.5 in | 30.6 | 65.4 | 1.53 | 7.64 | 15.28 |
| 3.0 in | 36.7 | 54.5 | 1.83 | 9.17 | 18.34 |
| 4.0 in | 48.9 | 40.9 | 2.45 | 12.23 | 24.45 |
Common driveway dimensions: raw and 5%-adjusted tons
Each raw value is shown beside a distinct 5%-adjusted planning quantity. Order-increment rounding is intentionally excluded from these comparison columns.
| Measured area | 2 in compacted | 3 in compacted | 4 in compacted | ||||
|---|---|---|---|---|---|---|---|
| Driveway | Area ft² | Raw tons | + 5% | Raw tons | + 5% | Raw tons | + 5% |
| 10 × 20 ft | 200 | 2.45 | 2.57 | 3.67 | 3.85 | 4.89 | 5.13 |
| 10 × 40 ft | 400 | 4.89 | 5.13 | 7.34 | 7.70 | 9.78 | 10.27 |
| 20 × 30 ft | 600 | 7.34 | 7.70 | 11.00 | 11.55 | 14.67 | 15.40 |
| 20 × 40 ft | 800 | 9.78 | 10.27 | 14.67 | 15.40 | 19.56 | 20.54 |
| 24 × 40 ft | 960 | 11.74 | 12.32 | 17.60 | 18.48 | 23.47 | 24.65 |
Measure the paved area carefully
For a rectangle, area is simply length × width. Irregular driveways and parking areas are usually easier to measure as several simple sections, adding paved pieces and subtracting islands or other cut-outs.
Use compacted depth, not loose delivery depth
The quantity calculation should be based on the finished compacted pavement thickness specified for the job. Loose material placed before rolling is not the same thing as final compacted thickness.
Density is a planning assumption, not a universal constant
Asphalt mixes and achieved compaction vary. JobsiteMeasure uses 2,350 kg/m³ as an editable planning density because the Minnesota Asphalt Pavement Association publishes 110 lb per square-yard-inch in its asphalt calculator, which converts to about 2,349 kg/m³.
Keep contingency separate from the raw requirement
The theoretical quantity is not automatically the amount you should purchase. A good estimate shows the raw tonnage first, then applies an explicit project-specific allowance.
US tons, metric tonnes and cubic yards are not interchangeable
- US short ton: 2,000 lb.
- Metric tonne: 1,000 kg.
- Cubic yard: a volume, not a mass.
Common asphalt quantity mistakes
- Using inches as though they were feet when calculating volume.
- Using loose depth instead of finished compacted depth.
- Measuring a bounding rectangle without subtracting exclusions.
- Treating one density as exact for every asphalt mix.
- Hiding contingency inside thickness or area.
- Confusing US short tons with metric tonnes.
Asphalt quantity questions
How many square feet does one US ton of asphalt cover at 2 inches?
About 81.8 ft² at the explicitly stated 146.7-lb/ft³ compacted planning density, before contingency.
How many tons are needed for 1,000 ft² at 2, 3, or 4 inches?
Use the coverage table above. It shows raw tons at each compacted depth before contingency or supplier rounding.
Is asphalt thickness measured loose or compacted?
Use the finished compacted thickness specified for the quantity calculation. Loose placement depth is not the same input.
What density should I use?
Use the supplier or mix-specific compacted density when available. The calculator’s editable default is 2,350 kg/m³, about 146.7 lb/ft³.
What is the difference between a US short ton and a metric tonne?
A US short ton is 2,000 lb. A metric tonne is 1,000 kg. Keep the selected mass unit explicit when comparing quotes.
Does 1 cubic yard of asphalt equal 1 ton?
No. Cubic yards measure volume and tons measure mass. The conversion depends on the asphalt mix density.
How do I measure an irregular driveway?
Split the paved area into simple added and subtracted sections, then use the Asphalt Calculator’s multiple-section mode.
Why is the recommended order higher than the raw tonnage?
The calculator shows an editable contingency and supplier purchase-increment rounding after the raw compacted requirement, rather than hiding them in the area or depth.
Sources and calculation basis
- Minnesota Asphalt Pavement Association asphalt calculator — 110 lb per square-yard-inch, the exact basis for the editable 2,350-kg/m³ default.
- Federal Highway Administration estimating table — 145.2 lb/ft³ for hot asphalt mix, used as national corroboration; it is not a replacement default.
- JobsiteMeasure methodology and source register — unit, density, contingency, and procurement stages.
Source checked August 30, 2026; generated values refreshed September 3, 2026. This guide is a quantity-planning resource and has not been independently reviewed as pavement design advice.
Have the measured area and specified compacted depth? Keep raw tons, contingency, rounding, and truckloads visible.
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