About the Sand Calculator
Sand needed for a slab, bedding layer, sandpit or mortar, in cubic metres, tonnes and bags.
Also known as: how much sand do i need, sand quantity calculator, sand tonnage, bedding sand.
How to use this calculator
- Enter length, width, depth, sand density and the other fields.
- The result updates instantly as you type — press Calculate (or Enter) at any time.
- Review the breakdown shown under the main result.
- Use Copy result or Share to save the answer or send a link with your inputs.
Formula
Volume = area × depth · tonnes = volume × density ÷ 1000
Worked example
Using the values pre-filled in the calculator above:
- Length = 5 m
- Width = 4 m
- Depth = 50 mm
- Sand density = 1,600 kg/m³
- Waste allowance = 10 %
- Price per tonne = 45
the calculator returns:
- Sand required: 1.1 m³
- In tonnes: 1.76
- In kilograms: 1,760
- 25 kg bags: 71