Gravel Calculator

Enter the footprint and depth. Paths want 2 to 3 inches over a compacted base; parking pads want 4 to 6 inches of crushed stone; drainage trenches vary. Crushed stone with fines (often sold as CA6, 21A, or 'road base') locks tight for bases; washed rounded gravel stays loose and drains.

Building a paver base? Use the paver patio calculator instead; it figures base, sand, and pavers together.