Asphalt Calculator
Estimate hot-mix asphalt in tons, cubic yards, and truckloads for driveways, parking lots, and roads.
Your Asphalt Estimate
- Enter dimensions — length and width of the area to pave.
- Select thickness — 2–3" residential, 3–4" commercial, 4–6" heavy traffic.
- Check density — 145 lb/ft³ is standard. Adjust if your plant specifies differently.
- Add waste — 10% standard. Higher for irregular shapes.
- Confirm with plant — verify tonnage and schedule delivery window.
How Much Asphalt Do I Need?
Asphalt quantity depends on area, thickness, and mix density. One ton of standard hot-mix covers roughly 80 square feet at 2 inches thick, or 53 square feet at 3 inches. For a typical two-car driveway (600 ft²) at 3 inches, plan for 11–12 tons before waste.
Hot-mix asphalt must be placed at 275–325°F and compacted immediately. Unlike concrete, you can't slow down mid-pour — have your crew and equipment ready before the truck arrives. Most plants require 24-hour advance orders.
Tonnage by Thickness
| Thickness | Tons/100 ft² | Tons/1,000 ft² | Common Use |
|---|---|---|---|
| 2 in | 1.21 | 12.08 | Overlay |
| 3 in | 1.81 | 18.13 | Driveway |
| 4 in | 2.42 | 24.17 | Parking lot |
| 6 in | 3.63 | 36.25 | Heavy traffic |
Based on 145 lb/ft³ compacted density. Actual density varies by mix design.
Recommended Thickness by Application
Under-paving leads to premature cracking; over-paving wastes material:
| Application | Thickness | Base Required |
|---|---|---|
| Walkway/path | 1.5–2 in | 4 in gravel |
| Residential driveway | 2–3 in | 6–8 in gravel |
| Parking lot | 3–4 in | 8–12 in gravel |
| Heavy trucks | 4–6 in | 12+ in gravel |
| Overlay | 1.5–2 in | Existing asphalt (milled) |
A properly compacted gravel base is as important as the asphalt layer. Without adequate base prep, even thick asphalt will crack and settle.
Formulas
Standard volume-to-weight conversion:
Volume = Area × (Thickness ÷ 12)
Weight (tons) = Volume × Density ÷ 2,000
Cubic yards = Volume ÷ 27
Default density: 145 lb/ft³ (2,320 kg/m³) for compacted hot-mix. Your plant may use a different mix-specific density.
Related Calculators
Asphalt needs a compacted gravel base. Browse the full surface calculator collection for base material tools.
Frequently Asked Questions
How much does a ton of asphalt cover?
One ton covers approximately 80 square feet at 2 inches thick, or 53 square feet at 3 inches. Coverage depends on compacted density — typically 140 to 150 lb/ft³ for standard hot-mix.
How thick should a residential driveway be?
A standard residential driveway uses 2–3 inches of compacted asphalt over a 4–6 inch compacted gravel base. Heavier vehicles (RVs, trucks) benefit from 3–4 inches of asphalt. The gravel base is as important as the asphalt layer — poor base preparation is the leading cause of early driveway failure.
How many tons of asphalt do I need for a driveway?
A standard 2-car driveway (20×40 ft) at 2.5 inches thick requires approximately 8–9 tons of asphalt. Use the calculator above for exact quantities — enter your length, width, and thickness. Hot mix asphalt weighs roughly 145 lb/ft³, so a 2.5-inch layer covers about 1 ton per 80–85 square feet.
Can I asphalt over an existing gravel driveway?
Yes, and it is common. The gravel acts as a base layer. The gravel must be compacted, have a consistent depth of at least 4 inches, and drain well. Low spots should be filled before paving. A geotextile fabric between gravel and asphalt can help prevent gravel migration into the asphalt over time.
Should I estimate asphalt by tons or cubic yards?
Asphalt is usually sold and quoted by the ton. Volume is still useful for planning thickness, but the final order is typically tons based on mix density and compaction. Use this calculator as an estimate and confirm density with your local supplier.