Gravel Driveway Material Calculator
Single Layer Gravel
Calculate gravel for a single uniform layer
Three-Layer Driveway
Proper 3-layer gravel driveway (base, middle, top)
Formula
Volume (cu yd) = (Length x Width x Depth/12) / 27 | Tons = Cu Yd x Density / 2000 | Add 15% for compaction
Frequently Asked Questions
How much gravel do I need for a driveway?
For a standard 12ft x 100ft driveway with 4 inches of gravel, you need about 6 cubic yards or roughly 8 tons. A properly built gravel driveway has three layers totaling 10-12 inches, requiring about 20 tons for the same size.
What is the best gravel for a driveway?
The best driveway gravel is a 3-layer system: #3 crushed stone for the base (4 inches), #57 stone for the middle (4 inches), and #21A crusher run for the top (2-3 inches). The crusher run compacts into a firm, smooth surface.
How thick should driveway gravel be?
A minimum of 4 inches of compacted gravel is needed, but 8-12 inches in three layers is ideal for longevity. The base layer provides drainage, the middle prevents mixing, and the top layer creates the driving surface.
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