Using the Gravel Calculator
The volume includes your selected percentage allowance. Mass then equals that volume multiplied by bulk density. Gravel grading, moisture and whether the layer is loose or compacted affect which density and depth assumptions are appropriate.
Worked example
Use the example inputs below to reproduce this result. These are the form's starting values, not recommended targets. Changing your inputs updates your result above; this worked example stays fixed for comparison. Results are rounded for display.
Example inputs
- Length (m)
- 5
- Width (m)
- 4
- Depth (cm)
- 5
- Extra allowance (%)
- 10
- Bulk density (kg/m³)
- 1600
Example result
- Volume (m³)
- 1.1
- Volume (cubic yards)
- 1.4387457
- Estimated mass (kg)
- 1,760
Method and assumptions
Length × width × depth, plus the selected allowance. Density is user supplied and varies with material and moisture.
Turn an estimate into an order
A geometric quantity is a starting point for purchasing. Check whether the supplier sells by bag, box, mass or bulk volume, and use the stated coverage or yield to convert the result. Round only after accounting for the chosen allowance and packaging increments. For irregular spaces, divide the job into simpler sections and combine quantities with the same units.
Common question
Is the default density correct for all gravel?
No. It is an example input. Material type and packing conditions affect bulk density, so use the specification for the product and condition you intend to model. Changing density changes mass while leaving the geometric volume unchanged.
Guide updated .