CalcStack — free, instant, no signup. The interactive calculator loads automatically.

Asphalt Calculator

Tons, not guesses — plus the coverage sanity check.

Asphalt is ordered by the ton and estimated by feel — which is how jobs come up short on the last pass. The math is simple: area times thickness times 145 lb per compacted cubic foot. This calculator runs it, shows the square-feet-per-ton coverage as a sanity check (about 80 sq ft per ton at 2 inches), and adds an editable cost layer.

Why people use this

Anyone getting paving bids uses this: asphalt is sold by the ton, and knowing your tonnage before the salesman arrives converts a black-box quote into a conversation. The sq-ft-per-ton check catches bad math on both sides of the transaction.

How it works

1. Enter the paving length and width in feet.
2. Pick compacted thickness: 2" for resurfacing, 3" standard driveway, 4" for heavy vehicles.
3. Read the tonnage and the coverage check.
4. Open the cost section for per-ton material and per-sq-ft paving labor rates.

Common questions

How many tons of asphalt do I need for a driveway?

Area × thickness × 145 lb/cu ft ÷ 2000. A 40×12 ft driveway at 3 inches: 480 sq ft × 0.25 ft = 120 cu ft × 145 = 17,400 lb ≈ 8.7 tons. Rule of thumb: one ton covers about 80 sq ft at 2" or 40 sq ft at 4".

Is the gravel base included?

No — tonnage here is paving only. A new driveway typically needs 4–8 inches of compacted road base under the asphalt; run that through the Road Base calculator with your excavation depth.

Browse all 500+ free calculators →