About the Stone Calculator
Natural stone or rockery stone for a wall or ground cover, by weight and volume.
Also known as: stone wall calculator, rock calculator, how much stone do i need, landscaping stone.
How to use this calculator
- Enter using stone for, length, stone density, void allowance 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
tonnes = volume × (1 − voids) × density ÷ 1000
Worked example
Using the values pre-filled in the calculator above:
- Using stone for: A stone wall
- Length = 10 m
- Height = 1 m
- Wall thickness = 0.4 m
- Stone density = 2,500 kg/m³
- Void allowance = 25 %
- Price per tonne = 120
the calculator returns:
- Stone required: 7.5 tonnes
- Total volume: 4 m³
- Solid stone volume: 3 m³
- In kilograms: 7,500