How to use the gravel calculator
- Measure the length and width of the area in feet.
- Decide on the depth of gravel you want, measured in inches (typically 2 to 4 inches).
- Select the gravel type from the dropdown to apply the correct density.
- Read the results instantly: the tool shows both cubic yards and US short tons.
How the gravel calculation works
The gravel calculator converts all measurements into cubic yards first, then multiplies by the material density to find the weight. The formula is straightforward:
Volume (yd³) = Length (ft) x Width (ft) x Depth (in) / 324
The divisor 324 comes from converting inches to feet (divide by 12) and cubic feet to cubic yards (divide by 27), since 12 x 27 = 324.
For example, a driveway that is 50 feet long, 12 feet wide, and 4 inches deep gives: 50 x 12 x 4 / 324 = 7.41 cubic yards. To find the weight in US short tons, multiply the volume by the density in pounds per cubic yard and divide by 2,000. Using crushed stone at 2,700 lb/yd³: 7.41 x 2,700 / 2,000 = 10.00 tons.
Common gravel densities
Different types of gravel weigh different amounts per cubic yard. Moisture content and compaction also change the final weight, but these standard figures are used across the landscaping industry for estimating orders.
| Gravel Type | Density (lb/yd³) | Tons per yd³ |
|---|---|---|
| Crushed stone / limestone | 2,700 | 1.35 |
| Pea gravel | 2,800 | 1.40 |
| River rock | 2,600 | 1.30 |
Always confirm the exact density with your supplier, as local stone composition varies. If your supplier quotes in metric tonnes rather than US short tons, remember that one short ton is 2,000 pounds while one metric tonne is about 2,204.6 pounds.
Recommended depths for common projects
Choosing the right depth ensures your gravel surface lasts without wasting material. Too little gravel exposes the soil beneath, while too much makes the surface unstable underfoot or under tires.
- Driveways: 4 to 6 inches. Heavy vehicles require a thicker base to prevent ruts. Many installers lay a 4-inch base of larger crushed stone topped with 2 inches of smaller gravel.
- Walkways and garden paths: 2 to 3 inches. Foot traffic does not compress the stone as heavily, so a thinner layer is sufficient.
- Patios: 4 inches. A solid base prevents shifting when pavers or furniture are placed on top.
- Drainage trenches: Fill completely to the surface, often 12 to 24 inches deep depending on the pipe size.
Ordering tips and waste factor
When you use this gravel calculator, the result represents the exact mathematical volume. In practice, you should add 5 to 10 percent extra to account for spillage, uneven ground, and compaction during installation. For a calculated requirement of 10 tons, ordering 10.5 to 11 tons prevents running short halfway through the job.
Gravel is typically sold by the ton or by the cubic yard. Bulk deliveries usually have a minimum order of 5 to 10 tons. Bagged gravel from home centers covers roughly 0.5 cubic feet per 50-pound bag, which means you would need 54 bags to equal one cubic yard. For any project larger than a small flower bed, bulk delivery is significantly cheaper.
Compaction and settling
Freshly spread gravel will settle over time, especially after rain or heavy use. Crushed stone locks together better than round pea gravel because its angular edges interlock. If you are building a driveway, compact each layer with a plate compactor before adding the next. This reduces future settling and keeps the surface level.
A well-compacted base may reduce the apparent volume by up to 15 percent compared to loose gravel sitting in a truck bed. This is why suppliers measure by weight (tons) rather than relying solely on the volume in their trucks. Always specify whether your quote is for loose or compacted material when discussing large orders.
Worked examples
Each result below was produced by the same code the tool runs, so you can check your own numbers against them.
| Example | Input | Result |
|---|---|---|
| Standard driveway | Length (feet): 50; Width (feet): 12; Depth (inches): 4; Gravel type: crushed | Volume: 7.41 yd³; Weight: 10.00 tons; Area covered: 600 sq ft |
| Garden path | Length (feet): 30; Width (feet): 3; Depth (inches): 2; Gravel type: pea | Volume: 0.56 yd³; Weight: 0.78 tons; Area covered: 90 sq ft |
| Patio base | Length (feet): 15; Width (feet): 15; Depth (inches): 4; Gravel type: crushed | Volume: 2.78 yd³; Weight: 3.75 tons; Area covered: 225 sq ft |
| Long rural road | Length (feet): 200; Width (feet): 10; Depth (inches): 6; Gravel type: river | Volume: 37.04 yd³; Weight: 48.15 tons; Area covered: 2,000 sq ft |
FAQ
How many square feet does a ton of gravel cover?
One ton of crushed stone covers approximately 80 to 100 square feet at a depth of 2 inches. At 4 inches deep, it covers about 40 to 50 square feet. Coverage depends on the gravel type and how tightly it is compacted.
What is the difference between a cubic yard and a ton of gravel?
A cubic yard measures volume, while a ton measures weight. Because gravel types have different densities, one cubic yard of crushed stone weighs about 1.35 US short tons, whereas one cubic yard of river rock weighs about 1.30 tons.
Should I put landscape fabric under the gravel?
Yes, laying a geotextile or landscape fabric beneath the gravel prevents weeds from growing through and stops the stones from sinking into the soil over time. It is especially important for driveways and permanent paths.
Can I use this gravel calculator for sand or dirt?
This tool uses densities specific to gravel. Sand and topsoil have different weights per cubic yard, so using gravel densities for those materials will give inaccurate results. Dry sand is typically around 2,600 to 2,800 lb/yd³, similar to some gravels, but wet sand is much heavier.
How deep should a gravel driveway be?
A standard gravel driveway should be 4 to 6 inches deep. Many professionals recommend a 4-inch base layer of larger crushed stone (like #3 or #57) topped with a 2-inch layer of smaller finishing gravel for a smooth driving surface.
Does the gravel calculator account for compaction?
The calculator provides the loose volume needed to fill your dimensions. Compaction reduces volume by up to 15 percent, so you should order 5 to 10 percent more gravel than the calculated amount to ensure full coverage after tamping.