Asphalt calculator
Asphalt is ordered by weight and laid by depth, so the compacted density is the bridge between them.
kg/m3
%
Asphalt to order
11.844tonnes
- Area
- 80.00
- Compacted volume
- 4.800
- Weight per square metre
- 141.0 kg/m2
- Loose laying depth
- 75
- Cost
- 1302.84
- Area in square yards
- 95.7
Show the working
- Length = 20
- Width = 4
- Compacted depth = 60
- Compacted density = 2350
- Waste allowance = 5
- Price per tonne = 110
- Area = 20 * 4 = 80
- Compacted volume = 80 * 60 / 1000 = 4.8
- Asphalt to order = 4.8 * 2350 / 1000 * (1 + 5/100) = 11.844
- Cost = 11.844 * 110 = 1302.84
- Weight per square metre = 60 / 1000 * 2350 = 141
- Loose laying depth = 60 * 1.25 = 75
- Area in square yards = 80 * 1.1959900463010802 = 95.6792
Values are shown to six significant figures here; the arithmetic itself runs on exact fractions and is only rounded where a number is printed.
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The formula
- tonnes = area x compacted depth x density x (1 + waste)
Asphalt compacts by about 20 to 25%, so lay it 25% thicker than the finished depth you want.