Measure the project area
Measure the length and width of the driveway, path, bed, or other rectangular area that will receive gravel.
Surface area = length × width
Landscaping & materials
Gravel Calculator
Estimate gravel volume for driveways, paths, beds, and other rectangular areas. Calculate cubic yards, estimated tons, waste, and optional material cost.
Calculation method
How to calculate how much gravel you need
Measure the length and width of the area, choose the gravel depth, then calculate the volume. Add a waste allowance if needed and use the density of your gravel to estimate weight in pounds and short tons.
Choose the gravel depth
Gravel quantity depends on depth as well as surface area. The calculator converts the entered depth from inches to feet before calculating volume.
Volume = length × width × depth
Add a waste allowance
Extra material can help cover uneven ground, spreading, settlement, compaction, and differences between planned and actual dimensions.
Required volume = base volume × (1 + waste %)
Estimate tons and cost
If you know the gravel density, multiply the required volume by that density to estimate weight. The calculator then converts pounds to U.S. short tons and can estimate material cost from a price per ton.
Weight = volume × density
Worked example
Suppose a gravel area measures20 ft × 10 ft and needs to be3 inches deep.
Three inches equals 0.25 ft, so the base volume is:
20 × 10 × 0.25 = 50 ft³
Adding a 10% waste allowance increases the requirement to 55 ft³, which is approximately2.04 yd³ or 1.56 m³.
If the gravel density is 100 lb/ft³, the estimated material weight is:
55 × 100 = 5,500 lb= 2.75 short tons
At $50 per ton, the estimated material cost is$137.50.
How much extra gravel should you allow?
The amount of extra gravel needed depends on the project, preparation, ground conditions, and how accurately the depth can be maintained.
- 5% — a smaller allowance for straightforward projects with well-controlled dimensions.
- 10% — a practical general allowance when some variation, spreading, or settlement is expected.
- 15% — a larger buffer for irregular surfaces or projects with greater uncertainty.
Use supplier, contractor, or project-specific recommendations when they specify a different quantity.
Why gravel density matters
Cubic yards measure volume, while tons measure weight. The relationship between them depends on the density of the specific gravel being used.
Gravel density can vary with stone type, particle size, grading, moisture, and compaction. For the best estimate, use the density provided by the supplier or product specification rather than assuming that every gravel type weighs the same.
You can leave the density field empty if you only need a volume estimate in cubic feet, cubic yards, or cubic meters.
Cubic yards vs. tons of gravel
Landscape and aggregate suppliers may sell gravel by volume or by weight. This calculator therefore reports both when enough information is provided.
One cubic yard always equals 27 cubic feet, but the weight of one cubic yard is not fixed because different gravel materials have different densities.
Gravel calculator FAQ
How do I calculate cubic yards of gravel?
Multiply length by width by depth to calculate cubic feet, then divide the result by 27 to convert cubic feet to cubic yards.
How do I estimate tons of gravel?
Multiply the required gravel volume by the material density to estimate pounds, then divide by 2,000 to convert pounds to U.S. short tons.
How deep should gravel be?
Required depth depends on the project, gravel type, base preparation, expected loads, and installation requirements. Use the depth specified for your particular project rather than relying on one depth for every application.
Why does gravel weight vary?
Different stone types, particle sizes, moisture levels, and compaction can produce different densities. That is why the calculator lets you enter a density instead of assuming one universal value.
Does the cost include delivery or installation?
No. The estimated material cost uses only the price per ton you enter. It does not include delivery, spreading, labor, excavation, base preparation, equipment, or other project expenses.
What this estimate assumes
- The entered length, width, and depth are accurate.
- The project is treated as a rectangular volume.
- The waste percentage represents the additional material you want included.
- The entered density represents the gravel you plan to use.
- Tons are U.S. short tons of 2,000 pounds.
- Estimated cost is based only on the entered price per ton.
Before purchasing: verify project dimensions, required depth, gravel type, density, compaction requirements, and supplier quantities for the actual material you plan to buy.