Gravel Calculator
Estimate gravel volume and weight for paths, patios and driveways.
About the Gravel Calculator
Enter the area and depth, the bag size if you're buying bags, and the gravel density. The calculator gives the volume in cubic yards or cubic metres, the number of bags and the weight.
Multiply the area by the depth for volume, then by the material's density for weight. Crushed stone and gravel typically weigh 1,500–1,700 kg/m³ (about 1.3–1.4 US tons per cubic yard). Driveways need 10–15 cm (4–6 in) of compacted base.
The formula
Volume = area × depth; 1 yd³ = 27 ft³ = 0.7646 m³
Worked example
100 ft² spread 4 inches deep
- 100 × 4 ÷ 12 = 33.3 ft³ = 1.23 yd³
- 67 bags of 0.5 ft³
- About 1.51 tonnes (1.66 US tons) loose
Questions people ask
How deep for a driveway?
4–6 in (10–15 cm) of base plus 2 in (5 cm) of top stone.
Tons or cubic yards?
Quarries sell by weight; this converts with the density you enter.