Gravel calculator
Enter the area and the depth you want to fill. You get cubic yards, tons, and an optional cost estimate.
Figures last reviewed October 2026. See sources.
Density used
Default density is 105 lb per cubic foot, about 1.42 tons per cubic yard, for typical gravel or crushed stone. Crusher run and other dense-graded base weigh more, so pick that option if it matches what you are buying. Pea gravel, river rock, and moisture all shift the weight, so use your supplier's figure if you have it.
Depth: typical ranges
These are common ranges, not requirements. Your soil, climate, and local rules may call for something different.
| Use | Depth |
|---|---|
| Decorative beds | 2 to 3 in |
| Walkways and paths | 2 to 4 in |
| Driveways (usually placed in layers) | 4 to 6 in |
How this is calculated
Area times depth gives volume in cubic feet. Divide by 27 for cubic yards. Multiply the volume by the density and divide by 2,000 to get tons.
Loose gravel settles after it is spread and compacted, so the calculator adds 10% by default. Reduce it to 0 if you only want the raw volume.
Example: a 20 ft by 10 ft area at 3 inches deep, with 10% extra, needs about 2.89 tons (2.04 cubic yards).
How far does one ton go?
Area covered by one ton at different depths, before any extra material.
| Depth | Square feet covered |
|---|---|
| 2 in | 114 |
| 3 in | 76 |
| 4 in | 57 |
| 6 in | 38 |
Quick reference: common sizes
Amount needed in tons, including the default 10% extra. Use the calculator above for your exact size.
| Area | 3 in deep | 4 in deep |
|---|---|---|
| 10 × 10 ft | 1.44 | 1.92 |
| 10 × 20 ft | 2.89 | 3.85 |
| 12 × 12 ft | 2.08 | 2.77 |
| 20 × 20 ft | 5.78 | 7.70 |
| 12 × 40 ft | 6.93 | 9.24 |
Common questions
How many tons of gravel do I need?
Find the volume in cubic feet (area times depth in feet), multiply by the density, and divide by 2,000. The calculator does this and adds your extra percentage for settling.
How many tons are in a cubic yard of gravel?
At the default density, about 1.42 tons per cubic yard. Different stone types and moisture levels shift this, so check with your supplier.
How much area does a cubic yard cover?
A cubic yard covers about 114 square feet at 2 inches deep and about 76 square feet at 3 inches, before any extra for settling.
How deep should a gravel driveway be?
Gravel driveways are commonly 4 to 6 inches deep, often built in layers. The right depth depends on your soil, drainage, and traffic, so confirm with a local supplier or installer.
Should I order extra?
A small allowance is usual because gravel compacts and spreads unevenly. The default is 10%. Adjust it under the advanced options.
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