Formula
How this estimate works
cubic yards = area x depth in feet / 27; tons = cubic yards x density
A 200 sq ft area at 4 in deep is about 2.47 cubic yards before waste.
How to calculate gravel
Calculate area, multiply by depth, then convert cubic feet to cubic yards. Tons depend on material density, which varies by gravel type and moisture.
Density assumptions
The calculator includes common density presets for pea gravel, crushed stone, road base, and river rock. Treat tonnage as an estimate and confirm with your supplier.
Assumptions used
- Default densities are planning estimates for common gravel materials.
- Tonnage changes with moisture, compaction, and aggregate size.
- Waste factor is useful for spreading loss and uneven subgrade.
Before you order materials
- Confirm depth requirements for traffic load and base layers.
- Ask your supplier for the density of the exact material.
- Consider compaction when estimating driveway or base-course gravel.
Frequently asked questions
How deep should gravel be?
Walkways may use around 2 to 3 inches, while driveways usually need deeper base layers. Project requirements vary.
Why do cubic yards and tons differ?
Cubic yards measure volume. Tons measure weight. The conversion depends on material density.
Should I add waste?
A 5% to 10% buffer is often useful for compaction, uneven surfaces, and spreading loss.