Garden & Landscaping calculator
Gravel Calculator
Estimate loose gravel volume and approximate weight for a measured area at a chosen finished depth, using the bulk density of the actual aggregate.
Estimate loose gravel volume and approximate weight for a measured area at a chosen finished depth, using the bulk density of the actual aggregate. Before calculating, confirm the measured geometry and any product specification entered into the form. Small errors in depth and bulk density can become significant across a full project. Different gravel grades have different void space and density. Use the supplier's loose bulk density and measure finished depth rather than relying on a generic tonne-per-cubic-metre figure.
What you need to enter
The Gravel Calculator uses the following project information to calculate the result.
- Length
- Width
- Depth
- Material density
- Extra allowance (%)
Calculator result
Volume and estimated weight
How the Gravel Calculator works
The Gravel Calculator estimates volume and estimated weight from this relationship: volume = L×W×D; mass = volume×density. Because the page is designed for gravel volume and estimated weight for paths, beds and general landscaping, the calculation depends especially on depth and bulk density. Metric and imperial entries are normalised before the arithmetic so equivalent measurements produce equivalent results.
Gravel Calculator worked example
Gravel Calculator example: For a 10 m × 3 m area at 50 mm depth, volume is 1.50 m³. If the selected gravel material has a bulk density of 1.6 t/m³, that is about 2.4 tonnes before the chosen allowance. The important sense-check is depth and bulk density, because that can move the real requirement away from the neat theoretical result.
Important calculation assumptions
For gravel volume and estimated weight for paths, beds and general landscaping, different gravel grades have different void space and density. Use the supplier's loose bulk density and measure finished depth rather than relying on a generic tonne-per-cubic-metre figure.
Frequently asked questions
Which inputs are most important in the Gravel Calculator?
Measure length, width and finished layer depth. Use a density that matches the material in the condition it will be supplied or compacted. On this page, the measurements are used specifically for gravel volume and estimated weight for paths, beds and general landscaping.
Which details about depth and bulk density should I verify for the Gravel Calculator?
The key uncertainty in the Gravel Calculator concerns depth and bulk density. Different gravel grades have different void space and density. Use the supplier's loose bulk density and measure finished depth rather than relying on a generic tonne-per-cubic-metre figure.
Should I order exactly the amount shown by the Gravel Calculator?
Use the calculated volume with the supplier's gravel density to estimate tonnage, then round to the supplier's bag, bulk-bag or loose-load increment. That is the practical way to carry the Gravel Calculator result into the next step.