How to Calculate Gravel for a Driveway

Driveways typically need more depth than a path

A driveway carries vehicle loads, so it is usually built deeper than a path, often in layers of different stone sizes: a coarser base under a finer surface. The right total depth depends on the soil, the traffic, the aggregate and the site's drainage, so take it from a local contractor or your municipality's requirements rather than a single rule of thumb.

Calculate each layer separately

If your driveway design uses a coarser base layer and a finer top layer, calculate each as its own area × depth volume, exactly as you would for a paver base and bedding sand — different materials, different depths, added together only after each is calculated with its own density.

The Gravel Driveway Calculator works one layer at a time; run it once per layer and add the results.

Width and length together

Driveway area is length × width, but don't forget to include any turnaround or parking pad areas as separate rectangular sections if the driveway isn't a simple uniform-width strip.

Compaction and ordering by weight

Driveway gravel is placed loose and compacted, so work from the finished depth and add an allowance for compaction. The U.S. Army and Marine Corps earthmoving manual (TM 3-34.62) gives a loose-to-compacted factor of 0.86 for sand or gravel — about 16% more loose material than the compacted volume — and the Gravel Driveway Calculator's default allowance is 15%, a calculator convention you can change. To order by weight, multiply by the stone's density: TM 3-34.62 lists dry gravel at about 1.35 to 1.5 tons per loose cubic yard.