Free online asphalt calculator

How to use

1. Enter the length and width of the area in feet.
2. Set the desired finished depth in inches (2–3 in for residential driveways).
3. Enter the compaction factor (20% is standard for hot mix).
4. Choose hot mix or cold patch.
5. Read tonnage, volume, and truckload count.

Formulas

area (sq ft)       = length × width

volume (loose, cu ft) = length × width × (depth / 12) × (1 + compactionFactor / 100)
volume (cu yd)     = volume (cu ft) / 27

tonnage            = volume (cu ft) × 145 lb/cu ft / 2000

truckloads         = tonnage / 10

cold patch bags    = area × depth  (bags per sq ft at 1-in depth)

Worked example

50 ft × 12 ft driveway, 3-in depth, 20% compaction, hot mix:

area               = 50 × 12 = 600 sq ft

volume (loose)     = 50 × 12 × (3/12) × 1.20
                   = 600 × 0.25 × 1.20
                   = 180 cu ft

volume (cu yd)     = 180 / 27 ≈ 6.67 cu yd

tonnage            = 180 × 145 / 2000
                   = 26,100 / 2,000
                   = 13.05 tons

truckloads         = 13.05 / 10 = 1.31 → order 2 truckloads

Notes

• Always add at least one partial truckload to your order to avoid running short on-site. Asphalt cools quickly and cannot be reheated.
• Hot mix asphalt has a short working window — typically 30–45 minutes at standard ambient temperatures. Have equipment and crew ready before the truck arrives.
• Get a gravel base quote before ordering asphalt; the subbase is as important as the surface course.