Material calculators for real building projects
Work out how much material to order — and see exactly how the number was reached. Every formula, density and assumption is shown on the page.
Browse the calculatorsA 40 ft × 12 ft driveway (480 sq ft) surfaced with 2 in of standard hot-mix asphalt, with the default 5% waste allowance. Area × thickness gives 80 cu ft, which becomes 84 cu ft with waste. At 145 lb/ft³ that is 12,180 lb.
Result
6.09 tons of asphalt
Calculators
- DrivewaysAsphalt CalculatorWork out how many tons of asphalt your driveway or lot needs, from its dimensions and compacted thickness — with the density and formula shown in full.
- drivewayGravel CalculatorWork out how many cubic yards or tons of gravel you need for a driveway, path or drainage bed — with the density for each aggregate type shown in full.
How these work
The formula is on the page
Every calculator shows its arithmetic step by step, so you can follow how your dimensions became a number and check it against your own.
Every constant is sourced
Material densities, coverage rates and code minimums are listed with their typical range and where they came from. No unexplained numbers.
Built for a phone in a store aisle
Numeric keypads, large targets, results without scrolling, and no ads or pop-ups above the calculator.