Calculate how many tons of hot mix asphalt you need for a driveway or paving project, based on area and thickness.
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This calculator finds the volume (Length × Width × Thickness) and converts it to weight using a typical compacted hot mix asphalt density of 145 lb per cubic foot, a commonly cited figure from paving suppliers: Tons = (Cubic Feet × 145) ÷ 2000.
Residential driveways are commonly paved 2 to 3 inches thick, while areas handling heavier vehicle loads (like a commercial lot) often use a thicker layer. Always check local specifications or with your paving contractor for the appropriate thickness for your specific use case and climate.
For a 40 ft × 12 ft driveway, 3 inches thick: volume = 40 × 12 × (3 ÷ 12) = 120 cubic feet, or 120 ÷ 27 ≈ 4.444 cubic yards. Converting to weight at 145 lb per cubic foot: (120 × 145) ÷ 2000 = 17,400 ÷ 2000 = 8.7 tons needed.
Forgetting this estimates the asphalt layer only, most driveways also need a compacted gravel base beneath the asphalt, which needs to be estimated and ordered separately from this tool's result.
Entering thickness in feet instead of inches, this calculator's thickness field expects inches, entering the intended feet value directly would inflate the tonnage estimate twelvefold.
Assuming asphalt is sold in bags like concrete mix, it isn't, asphalt is delivered hot and installed immediately by paving equipment, so it's quoted and ordered by weight (tons), not by a bag count.
Asphalt is delivered hot and installed immediately by paving equipment, it isn't sold in bags like concrete mix or mulch, so contractors and suppliers quote and deliver it by weight (tons).
Yes, actual compacted density can vary somewhat based on the specific asphalt mix design and compaction achieved. 145 lb per cubic foot is a reasonable planning estimate; your paving contractor can give you an exact figure for the mix they're using.
No, this calculates the asphalt layer only. Most driveways also need a compacted gravel base beneath the asphalt, which would need to be estimated separately.
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