Asphalt Calculator
Find how many tons of hot mix asphalt a driveway or lot needs, with an optional gravel base and the cost.
Change the values and press Calculate to work out your own figures.
From length and width
Enter the length and width.
Show the working
- cubic feet = area × thickness
- tons = cubic feet × 145 lb/ft³ ÷ 2,000
From an area
Enter the area.
Show the working
- cubic feet = area × thickness
- tons = cubic feet × 145 lb/ft³ ÷ 2,000
How to use it
Enter the length and width. Enter the area.
Lengths can be decimals, fractions or tape entries such as 12' 6 1/2" (in feet or inches). Prices are optional.
Key facts
tons = length × width × thickness (cu ft) × 145 lb/ft³ ÷ 2,000
Thickness
Residential driveways are usually at least 3 in of asphalt (4–6 in in cold climates) over 4–8 in of compacted gravel; parking lots more.
Questions
How many tons of asphalt for 10 × 20 ft at 3 in?
3.63 tons (50 cu ft × 145 lb ÷ 2,000).
How much does asphalt weigh?
About 145 lb per cubic foot (142–148).
Formulas
tons = length × width × thickness (cu ft) × 145 lb/ft³ ÷ 2,000
Sources
Limitations
- Material densities are typical values (the midpoint of the commonly published range); real loads vary with moisture, grading and compaction, so check with your supplier or type in their density.
- Tank results are the geometric volume; real tanks have wall thickness and fittings.