How this calculator works
Ordering asphalt is done by the ton, but you measure a project in square feet, so this tool bridges the two. It takes a total surfaced area, a compacted depth and a mix density, converts them to a volume, and returns the weight in both pounds and US tons. Because it works from a single area figure, you skip breaking the job into shapes — pave a walkway, a court or a driveway with the same three inputs.
If your surface is an irregular shape, total it first with the asphalt area calculator, then bring the number here. To confirm the depth a spec quotes in inches converts cleanly to feet, use the asphalt thickness calculator, and for the same math with spread-rate options see the asphalt tonnage calculator.
The formula
Tons = Area (sq ft) × (Depth in ÷ 12) × 145 lb/ft³ ÷ 2,000
With waste: Tons × (1 + Waste %)
Example: 1,000 sq ft × (2 in ÷ 12) × 145 ÷ 2,000 = 12.08 tons. The depth is divided by 12 to turn inches into feet, 145 lb/ft³ is the standard hot-mix density, and 2,000 is the number of pounds in one US short ton.
Worked examples
Example 1 — a 1,000 sq ft surface at 2 inches
- Area:
- 1,000 sq ft
- Compacted depth:
- 2 in
- Mix density:
- 145 lb/ft³
- Convert depth: 2 in ÷ 12 = 0.167 ft
- Volume: 1,000 sq ft × 0.167 ft = 166.7 cu ft
- Weight: 166.7 cu ft × 145 lb/ft³ = 24,167 lb
- Convert to tons: 24,167 lb ÷ 2,000 = 12.08 tons
- Add 8% waste: 12.08 × 1.08 = 13.05 tons
Order about: 13 US tons
Every inch of thickness over 1,000 sq ft adds about 6 US tons at 145 lb/ft³, so the same area at 3 inches would be roughly 18 tons before waste.
Example 2 — a 30 ft × 60 ft court at 3 inches
- Area:
- 30 ft × 60 ft = 1,800 sq ft
- Compacted depth:
- 3 in
- Mix density:
- 145 lb/ft³
- Convert depth: 3 in ÷ 12 = 0.25 ft
- Volume: 1,800 sq ft × 0.25 ft = 450 cu ft
- Weight: 450 cu ft × 145 lb/ft³ = 65,250 lb
- Convert to tons: 65,250 lb ÷ 2,000 = 32.6 tons
- Add 5% waste: 32.6 × 1.05 = 34.3 tons
Order about: 34 US tons
Larger, regular rectangles have less edge per square foot, so a 5% allowance is usually enough.
Reference data
| Compacted thickness | Volume per 1,000 sq ft | Tons per 1,000 sq ft | Coverage per ton |
|---|---|---|---|
| 1.5 in | 125 cu ft | 9.06 tons | ≈ 110 sq ft |
| 2 in | 166.7 cu ft | 12.08 tons | ≈ 82 sq ft |
| 3 in | 250 cu ft | 18.13 tons | ≈ 55 sq ft |
| 4 in | 333.3 cu ft | 24.17 tons | ≈ 41 sq ft |
| Density (lb/ft³) | Density (kg/m³) | Note |
|---|---|---|
| 142 lb/ft³ | 2,275 kg/m³ | Low end of the in-place range |
| 145 lb/ft³ | 2,323 kg/m³ | OtherCalculators default |
| 148 lb/ft³ | 2,371 kg/m³ | Asphalt Institute “Use 148 PCF” |
Key facts
- At 145 lb/ft³, one square foot of compacted asphalt weighs about 12.1 lb per inch of thickness.
- One US ton of asphalt covers roughly 80–82 square feet at 2 inches — about 82 at the 145 lb/ft³ default, nearer 80 at 150.
- Every inch of compacted asphalt over 1,000 square feet weighs about 6 US tons at 145 lb/ft³.
- The Asphalt Institute gives in-place asphalt mixture unit weight as 142–148 lb/ft³; this calculator defaults to 145.
Who should use this and when
Reach for this when you already know the area and just need an order weight — a contractor sizing a delivery, a facilities manager checking a paving bid, or a homeowner ordering hot mix for a court or a shed pad. It is the general-purpose version of the shape-specific tools: for a residential driveway the asphalt driveway calculator pre-sets typical dimensions, and for a commercial lot the asphalt parking lot calculator uses commercial thicknesses. Once you have the tonnage, price it with the asphalt paving cost calculator.
Tips and common pitfalls
- Enter compacted depth, not the loose lift. Fresh mix "fluffs" and is rolled down; order against the finished, compacted thickness the spec calls for.
- Add waste before you order, not after. A 5–10% allowance covers compaction and edges, and rounding up to the supplier's minimum load avoids a second delivery for a few missing tons.
- Confirm the density with your supplier. A mix nearer 148 lb/ft³ raises the tonnage; the asphalt density calculator converts a kg/m³ figure into the lb/ft³ this tool expects.
- The aggregate base is a separate order. This tool sizes the asphalt surface only, not the crushed-stone base beneath it.
Paving FAQs
How much asphalt do I need for a paving project?+
Multiply the area in square feet by the compacted depth in feet (inches ÷ 12), then by 145 lb/ft³, and divide by 2,000 for US tons. A 1,000 sq ft area at 2 inches is about 12 tons; at 3 inches about 18 tons — before a 5–10% waste allowance.
What is the basic formula for asphalt paving?+
Tonnage = area (sq ft) × (depth in ÷ 12) × 145 lb/ft³ ÷ 2,000. The depth is divided by 12 to convert inches to feet, 145 lb/ft³ is the standard hot-mix density, and 2,000 is the number of pounds in one US short ton.
How much does a square foot of asphalt weigh?+
At 1 inch thick and 145 lb/ft³, one square foot of compacted asphalt weighs about 12.1 lb (1 ÷ 12 × 145). At 2 inches it is roughly 24.2 lb per square foot. Weight scales directly with thickness.
How many square feet does one ton of asphalt cover?+
About 80–82 square feet at 2 inches — nearer 82 at the 145 lb/ft³ default and closer to 80 at 150 lb/ft³. At 1 inch one ton covers roughly 165 sq ft, and at 3 inches about 55 sq ft. Coverage halves as thickness doubles.
Should I use hot mix or cold mix asphalt for paving?+
Hot mix asphalt is the standard for paving driveways, lots and roads because it compacts into a durable, sealed surface. Cold mix is for temporary or small repairs. This calculator uses the 145 lb/ft³ density typical of compacted hot mix.
How much extra asphalt should I order for waste and compaction?+
Most contractors add 5–10% to the calculated tonnage for compaction, spillage and irregular edges, then round up to the supplier's minimum load. Small or irregular areas with more edge per square foot sit near the top of that band.
What density should I use for asphalt paving?+
The Asphalt Institute gives an in-place unit weight of 142–148 lb/ft³, and this calculator defaults to 145 lb/ft³. Ask your supplier for the specific mix density if you need a precise order, since a heavier mix raises the tonnage.
Related Asphalt Tools
Calculate required hot mix asphalt tonnage for any paving project.
Asphalt Paving Cost CalculatorCalculate costs for commercial paving projects.
Asphalt Parking Lot CalculatorTonnage estimator for commercial parking lots.
Asphalt Road CalculatorCalculate asphalt needs for roads and lanes.
Asphalt Volume CalculatorCalculate asphalt volume in cubic yards, feet, or meters.
Asphalt Weight CalculatorConvert asphalt volume to tons using standard density.
Estimates & assumptions
- Tonnage is computed as area × (thickness ÷ 12) × density ÷ 2,000, in US short tons of 2,000 lb.
- The 145 lb/ft³ default is a planning convention inside the Asphalt Institute's 142–148 lb/ft³ in-place range. Ask your supplier for your specific mix density.
- Coverage-per-ton figures assume compacted hot mix at 145 lb/ft³ and exclude waste.
- This tool estimates surface asphalt only; it excludes the aggregate base and does not perform pavement structural design.
Estimates are for planning only. Confirm thickness and mix density against the project specification before ordering material.