Gravel Driveway Basics: Depth and Tonnes

1. Layers

A good gravel drive usually has a compacted base of coarser road base, with a finer surface layer on top. The base carries the weight; the top gives a smooth surface.

2. Depth

Depth depends on the ground and traffic. Soft ground and heavy trucks need a thicker base. Ask your supplier or a local contractor what works in your soil.

3. Drainage

Water ruins driveways. Build a slight crown or cross-fall so water runs off, and put in drains or spoon drains at low points.

4. Tonnes

Volume = length × width × depth. Gravel is sold by the tonne. Multiply cubic metres by the product's density, which the supplier can give you. Allow extra for compaction.

5. Work it out

Try the Gravel Tonnes Calculator.

General information only. Check the maker's instructions, and ask your council about approvals.

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