How to calculate gravel volume
Multiply the project length by width and depth. When depth is entered in inches, convert it to feet by dividing by 12 before calculating cubic feet.
Gravel calculation example
A 20-foot by 10-foot area at 3 inches deep contains 50 cubic feet of material, which is approximately 1.85 cubic yards.
How gravel tons are estimated
Weight is estimated from volume using an approximate conversion factor. Actual material density can vary significantly, so supplier weight figures are better for final ordering.
Driveways, paths and base layers may compact after placement. It can be sensible to include extra material depending on the application.
Frequently asked questions
How many cubic yards of gravel do I need?
Multiply length, width and depth to find cubic feet, then divide by 27 to convert to cubic yards.
How many tons are in a cubic yard of gravel?
It varies by material. This calculator uses an approximate factor of 1.4 tons per cubic yard.
How deep should gravel be?
Required depth depends on the application, subgrade and material. Follow project specifications or supplier guidance.
Should I order extra gravel?
Extra material may be useful for grading, compaction, settlement and uneven site conditions.