GUIDE深度 · Deep dive
Gravel Driveway Depth and Tonnage
A gravel driveway usually needs a 4-6 inch surface layer plus a 4-6 inch base; gravel on soft soil will sink. Volume in cubic yards equals area times depth in inches divided by 324, and tons are roughly 1.3-1.5 tons per cubic yard depending on stone.
Structure
Base: 4-6 inches of larger crushed stone, compacted.
Surface: 4-6 inches of #57/#21A or similar, depending on use.
Add geotextile or a thicker base on soft or sloped ground.
Tonnage
Calculate cubic yards, then use the supplier's tons per cubic yard.
Compaction reduces volume; order about 10% extra.
FAQ
Is 4 inches enough?
For light foot traffic maybe; cars and trucks need about 6 inches plus a base.
Does it need compaction?
Yes, compact in 2-3 inch lifts.