Understanding the Gravel Calculator
A gravel calculator estimates the volume and weight of gravel needed for a driveway, path, or drainage project, based on the area and depth. Because gravel is heavy and often sold by weight, knowing the tonnage helps you order and budget correctly.
Volume to weight
The calculator first finds the volume from area and depth, then converts to weight using gravel’s density — roughly 1.4 to 1.7 tons per cubic yard depending on the type and moisture. Suppliers commonly sell by the ton, so this conversion is what lets you place an accurate order.
Depth for the job
Recommended depth depends on use: a few inches suffices for a walking path, while a driveway that supports vehicles needs a deeper base, often built in layers. Compaction also reduces loose volume, so ordering a little extra accounts for settling once the gravel is spread and driven on.
Tips & things to know
- •Driveways need a deeper, layered base than paths.
- •Gravel is sold by weight — about 1.4–1.7 tons per cubic yard.
- •Order extra to allow for compaction and settling.