The formula
Volume (m³) = length × width × depth (mm) ÷ 1,000. Tonnes = volume × density (tonnes/m³). Bulk bags = kilograms ÷ kg per bag, rounded up.
Garden • UK CALCULATOR
Gravel Calculator UK
Measure your gravel area and choose a depth to estimate volume, weight and bulk bags. Adjust the bulk density and bag weight to match your supplier.
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Your estimate starts here
Enter your measurements and calculate to see materials, quantities and an optional price estimate.
GOOD TO KNOW
How this calculator works
Worked example
A 5 m × 2 m path at 50 mm deep is 0.50 m³ before allowance. At 1.6 t/m³ that is about 0.8 tonnes before allowance.
Check before ordering
Gravel density varies by stone type, grading and moisture. Compaction and ground conditions affect the required depth. Driveway layers and foundations need a separate specification.