Estimate the tons of hot-mix asphalt needed for a driveway or lot from the area and compacted thickness.
tons = volume_ft³ × 145 lb/ft³ ÷ 2000
Compacted hot-mix asphalt weighs about 145 lb per cubic foot. Volume times density gives tonnage.
Residential driveways use 2–3″ of asphalt over a compacted gravel base.
A 40 x 12 ft driveway at 3 inches of compacted asphalt is 120 cubic feet. Hot-mix asphalt weighs about 145 lb per cubic foot, so that's 120 x 145 = 17,400 lb, or 8.7 tons. With 5% waste, order about 9.1 tons.
Asphalt is always sold and laid by the ton. The 3-inch figure is the compacted thickness — asphalt is laid thicker and rolled down, so discuss laid-versus-compacted depth with your paver. Residential drives typically get 2-3 inches of asphalt over 6-8 inches of compacted gravel base.
Density of compacted HMA is about 145 lb/ft³ — an industry average that varies with mix. Confirm with your supplier.
Asphalt is ordered by the ton. Take the paved area times the compacted thickness in feet to get the volume, then multiply by about 145 pounds per cubic foot and divide by 2,000. Use the compacted (finished) thickness, not the loose lay-down depth — the density figure already represents compacted hot-mix, so plugging in loose depth over-orders.
Asphalt is only as good as its base. A driveway typically sits on 4–8 inches of compacted aggregate base, more for heavy use or poor soil. Estimate the base separately as its own volume and tonnage. Thicker pavements are placed in two lifts — a coarse binder course below and a finer surface course on top — each estimated separately.
At 3″ thick, roughly 0.018 tons per square foot of compacted asphalt.
Multiply the area in square feet by the compacted thickness in feet, then by 145 pounds per cubic foot, and divide by 2,000. A rule of thumb is about 110–120 pounds per square yard per inch of depth.
Use the compacted, finished thickness. The density of 145 pounds per cubic foot represents compacted hot-mix, so loose depth would over-order.
Yes. A driveway typically needs 4–8 inches of compacted aggregate base beneath the asphalt, estimated as its own volume and tonnage.