How Much Gravel Do I Need?

Calculate volume first

Multiply length × width × depth in feet to get cubic feet. Divide cubic feet by 27 to get cubic yards. If depth is measured in inches, divide it by 12 first.

Convert volume to approximate weight

Approximate tons = cubic yards × bulk density in tons per cubic yard. The density is not universal. Different aggregates can have different densities, and moisture and compaction can change the actual weight.

Example

A 20 ft × 10 ft area at 3 inches deep is 200 square feet. Three inches is 0.25 ft, giving 50 cubic feet or about 1.85 cubic yards. If a supplier’s planning density were 1.4 tons per cubic yard, the approximate weight would be about 2.59 tons. That density is an example, not a universal value.

Add a practical allowance

Small errors in depth or the shape of the area can affect the quantity. An allowance can make a planning estimate more useful, but the correct amount depends on the project and material.

Use the calculator

Enter the area, depth, density and allowance in the Gravel Calculator. If your supplier provides a product-specific density or delivery conversion, use that information instead of a generic assumption.

Use the calculator

Ready to run the numbers? Use the BuildPlanTools calculator, then compare the estimate with the product label, supplier information and project requirements.

These estimates are for general planning. Product specifications, site conditions, local requirements and professional recommendations should take priority where applicable.