Asphalt Calculator
To estimate asphalt, multiply length × width × thickness (in feet) to get cubic feet, divide by 27 for cubic yards, then multiply by ~2 to get tons (asphalt weighs ~145 lbs per cubic foot).
Enter length, width (feet) and depth (inches), get tons of hot-mix asphalt, with every step shown.
How to use this calculator
Enter the length and width of the area in feet and the compacted depth in inches, then press Calculate. The calculator converts depth to feet, finds the volume, multiplies by the standard hot-mix density (145 lb per cubic foot), and converts pounds to tons, the unit asphalt is ordered in, with every step on screen.
Residential driveways are typically paved 2–3 inches thick (after compaction); areas with trucks or heavy turning need 3–4 inches over a proper stone base.
How it works
The chain is volume → weight → tons. Volume = L × W × (depth_in ÷ 12) in cubic feet. Hot-mix asphalt weighs about 145 pounds per cubic foot, a dense, well-established figure. Multiply to get pounds, then divide by 2000 (pounds per ton). The calculator shows each link so a paving contractor can verify the numbers.
Pro tips
Measure twice: re-measure the area after marking it, driveways are rarely perfect rectangles, so take the longest length and widest width. Compact in lifts: stone base goes down in 2-inch lifts, each compacted; asphalt in a single lift up to 3 inches. Weather matters: pavers will not lay hot-mix below about 50°F, the mat cools too fast to compact properly.
Note the depth you enter should be the compacted thickness. Loose hot-mix compacts roughly 20–25%, so pavers lay it thicker than the final depth, but you order by the compacted volume this calculator computes.
Worked example
Example: 40 ft × 12 ft driveway, 3 in thick
Step 1, Depth to feet: 3 ÷ 12 = 0.25 ft.
Step 2, Cubic feet: 40 × 12 × 0.25 = 120 ft³.
Step 3, Pounds: 120 × 145 = 17,400 lb.
Step 4, Tons: 17,400 ÷ 2000 = 8.7 tons.
Ordering: add 5–10% for waste and uneven base, order about 9.5 tons. A tri-axle dump truck hauls roughly 20 tons, so this is well under one load.
More examples: 25 × 20 ft at 2 in → 3.0 tons; 100 × 12 ft lane at 3 in → 21.75 tons.
Common mistakes
- Using loose depth instead of compacted: the calculator wants final compacted thickness. Ordering by loose depth over-buys ~25%.
- Skipping the stone base: asphalt needs 4–8 inches of compacted crushed stone beneath it. Paving directly on soil fails within a couple of seasons.
- Forgetting waste: edges, hand-work areas, and truck cleanup consume extra. Add 5–10%.
- Thin paving to save money: under 2 inches compacted, asphalt cracks and ravels quickly, the “savings” become a re-pave.
When to use it
Driveways, parking areas, private roads, basketball courts, and patch repairs, anywhere hot-mix asphalt is placed. For the stone base underneath, use the gravel calculator; for concrete work instead, the cubic yard calculator gives yardage.
Full walkthrough: a parking pad
A 20 x 20 ft pad at 3 inches: depth 3 div 12 = 0.25 ft; volume 20 x 20 x 0.25 = 100 ft3; weight 100 x 145 = 14,500 lb; tons 14,500 div 2000 = 7.25 tons. Add 10% for soft edges: order 8 tons.
Frequently asked questions
Multiply length × width × (depth in inches ÷ 12) for cubic feet, × 145 for pounds, ÷ 2000 for tons. A 40×12 ft driveway at 3 inches needs about 8.7 tons, order ~9.5 with waste. Enter your dimensions above.
Two to three inches of compacted asphalt over 4–6 inches of compacted crushed stone base. Heavy vehicles or turning areas need 3–4 inches of asphalt.
About 145 pounds per cubic foot for hot-mix asphalt. That is the standard density this calculator uses to convert your volume into orderable tons.
Hot-mix is laid loose about 20–25% thicker than its final depth, then rolled. Enter the final compacted thickness you want, the calculator computes the volume you actually need to order.
At 3 inches thick, one square foot needs 0.25 ft³ × 145 lb/ft³ ≈ 36 lb, or 0.018 tons. A 500 sq ft driveway at 3 in needs about 9 tons before waste.
Yes, with an overlay of at least 2 inches, but cracks in the old surface eventually reflect through. For badly broken concrete, remove it and build a proper stone base instead.