Gravel, Sand and Crush Calculator
Work out how much gravel, sand, crushed stone (bajri), topsoil or mulch an area needs, in cubic feet, cubic metres and tonnes.
In inches when measuring in feet, or centimetres when measuring in metres.
Volume
66.7 cft (1.89 m³)
- Weight
- 3.02 tonnes
- Small truck loads (about 100 cft)
- 1
Covering 20 × 10 ft to 4 inches takes about 67 cft of crushed stone (bajri, crush), roughly 3 tonnes.
How it's worked out
- Volume
20 × 10 ft × 4 in ÷ 1266.7 cft - Weight
1.888 m³ × 1.6 t/m³3.02 t
- Densities are typical and vary with moisture and stone size. Order about 10% extra for compaction and spillage.
The formulas
Volume = length × width × depth · Weight = volume × density
Worked example
An area of 20 × 10 ft filled 4 inches deep is 66.7 cft (1.89 m³). At 1.6 tonnes per m³ for crushed stone, that's about 3 tonnes.
Questions people ask
How much gravel do I need?
Multiply length × width × depth to get the volume, then multiply by the material's density for the weight. 20 × 10 ft at 4 inches deep is 66.7 cft, about 3 tonnes of crush.
How much does a cubic metre of sand weigh?
About 1.6 tonnes when dry and loose, and up to 1.9 tonnes when wet.
Should I order extra?
Yes, about 10%, for compaction, uneven ground and spillage.
About this calculator
Formula and rules last checked 25 October 2026Written and tested by the CalculatorDex teamReport a problem