Use this asphalt calculator to estimate the material quantity for a driveway, parking area or another paving project. Enter length and width or an area you already know, then add your planned compacted thickness and mix density. The result shows US short tons and metric tonnes, with an optional allowance and material-cost estimate.
CivilEase • Pavement quantities
Calculate your asphalt quantity
Use your project's specified thickness and your supplier's compacted-mix density.
Your quantity and optional material-cost estimate will appear here.
Quantity including your allowance
Add a supplier price above to estimate material cost.
Scope: This is a quantity estimate for an asphalt layer using a thickness you supply. Selecting the pavement thickness, base and mix requires a project-specific design.
Calculation method · Worked examples · Coverage per ton · Common questions
How to calculate asphalt tonnage
The calculation has two parts: find the volume of the finished layer, then multiply that volume by its compacted density. For a rectangle, area is length × width. For an irregular outline, split the plan into measurable sections, add their areas and use the calculator's Known area mode.
Volume = area × compacted thickness
Material mass = volume × compacted density
Quantity with allowance = material mass × (1 + allowance % ÷ 100)
Keep the length units consistent. Convert inches to feet before multiplying an area in square feet by thickness. In metric calculations, convert millimetres to metres before multiplying by an area in square metres.
Feet, inches and US short tons
US short tons = area (ft²) × thickness (in) × density (lb/ft³) ÷ 24,000
The denominator combines 12 inches per foot and 2,000 pounds per US short ton.
Metres, millimetres and metric tonnes
Metric tonnes = area (m²) × thickness (mm) × density (kg/m³) ÷ 1,000,000
The denominator combines 1,000 millimetres per metre and 1,000 kilograms per metric tonne.
What density does this asphalt calculator use?
The starting value is 146.67 lb/ft³, approximately 2,349.43 kg/m³. It is a rounded conversion of the Minnesota Asphalt Pavement Association's reference of 110 pounds for a square yard of pavement one inch thick. That volume is 0.75 ft³, giving 110 ÷ 0.75 = 146.666… lb/ft³.
This reference makes the assumption visible; your mixture can have a different density. Replace it with the supplier's or project's compacted bulk-density value when available. Changing measurement units converts the density already entered rather than selecting a different mix.
Compacted thickness and compacted density already describe the finished layer. An additional compaction multiplier would double-count compaction. The separate estimating allowance lets you account for a margin agreed for your project, such as measurement uncertainty or handling losses. Its starting value is zero.
Worked examples
Example 1: a 20 ft × 50 ft paving area
For an illustrative 3-inch compacted layer, a density of 146.67 lb/ft³ and a 10% allowance:
- Area = 20 × 50 = 1,000 ft².
- Compacted volume = 1,000 × (3 ÷ 12) = 250 ft³, or approximately 9.26 yd³.
- Calculated mass = 250 × 146.67 = 36,667.5 lb = 18.33375 US short tons.
- With allowance = 18.33375 × 1.10 = 20.167125, displayed as 20.17 US short tons.
If an example material price is USD 80 per US short ton, material cost is 20.167125 × 80 = USD 1,613.37. This price is an illustration, not a current supplier quotation. The example thickness and allowance are calculation inputs, not design recommendations.
Example 2: a 100 m² paving area
Using an illustrative 50 mm compacted layer, a reader-entered density of 2,400 kg/m³ and a 5% allowance:
- Compacted volume = 100 × (50 ÷ 1,000) = 5 m³.
- Calculated mass = 5 × 2,400 = 12,000 kg = 12 metric tonnes.
- With allowance = 12 × 1.05 = 12.60 metric tonnes.
- At an illustrative EUR 90 per metric tonne, material cost = 12.60 × 90 = EUR 1,134.00.
The calculator retains unrounded quantities for conversions and cost calculations, then rounds the displayed results. Confirm the supplier's order increments and minimum load before placing an order.
How much area does one ton of asphalt cover?
Coverage depends on both compacted thickness and density. At the tool's reference density of 146.67 lb/ft³, the theoretical coverage of one US short ton is:
Coverage (ft²) = 24,000 ÷ [density (lb/ft³) × thickness (in)]
| Example compacted thickness | Area per US short ton |
|---|---|
| 1 inch | 163.63 ft² |
| 2 inches | 81.82 ft² |
| 3 inches | 54.54 ft² |
| 4 inches | 40.91 ft² |
These figures exclude allowance. Use your project's specified depth; the rows illustrate how thickness changes coverage.
For metric quantities, coverage in m² per tonne is 1,000 ÷ [density (kg/m³) × thickness (m)]. For example, at 2,400 kg/m³ and 0.05 m thickness, one metric tonne covers approximately 8.33 m² before allowance.
How to estimate asphalt material cost
Multiply the quantity including your chosen allowance by the supplier's price for the same weight unit. A price per metric tonne must be applied to metric tonnes; a price per US short ton must be applied to short tons. The calculator has a separate price-unit selector so you can match the quotation even when using a different measurement system.
Ask whether a quoted price includes delivery and whether minimum-load charges apply. Installation can also involve removal, base work, drainage work, equipment, labour and tax. Record those separately when building a total project budget.
Common questions
Is a ton the same as a tonne?
A US short ton is 2,000 lb, equal to 907.18474 kg. A metric tonne is 1,000 kg. The tool displays both and does not use the UK long ton. Check the unit stated on your supplier's quote.
Can I calculate asphalt from square feet only?
Yes. Select Known area, enter your square footage and provide the compacted thickness and density. Square footage alone cannot determine material mass because layers of different thicknesses contain different volumes.
Can this calculate a parking area or several pavement layers?
Use the area that will actually receive asphalt, excluding islands and unpaved sections. If different sections or layers have different thicknesses or densities, calculate them individually and add the resulting quantities. Keep any separate material prices attached to the appropriate layers.
Can I use the same density for asphalt millings?
Recycled millings have a different material condition from a finished asphalt-mix layer. This tool is set up for compacted asphalt mix. For millings, obtain the supplier's appropriate bulk density and establish whether the quantity describes loose delivery or a compacted layer before estimating it.
What allowance should I enter?
Use the allowance agreed for your estimate or project. The tool does not prescribe a percentage. It shows the base quantity and additional allowance separately so you can see how your chosen margin changes the total.
Related CivilEase reading
References and unit definitions
- Minnesota Asphalt Pavement Association: Asphalt Calculator — reference unit weight for compacted pavement.
- NIST Special Publication 1038: SI Conversion Factors for General Use — unit conversions and short-ton / metric-tonne definitions.
Method and worked examples checked on 2 October 2026. Prepared by CivilEase. Use the printable estimate to keep your inputs and assumptions with the result.
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