Ordering gravel is easier when you know the area, the planned depth and the material’s approximate density. Ordering too little can delay a project; ordering too much can leave you with unused material. This guide explains the calculation for a rectangular driveway or pathway and shows how to estimate cubic yards and weight.
1. Measure the area
For a rectangular driveway, measure its length and width in feet. If the area is irregular, divide it into rectangles, calculate each section, and add the volumes together. For a circular area, use the circle formula instead of the rectangle formula.
2. Choose the gravel depth
Measure the intended gravel layer depth. Depth recommendations vary with the project, ground conditions, stone size and whether the gravel is decorative or intended for vehicle traffic. Use the depth specified by your contractor or material supplier rather than relying on a universal thickness.
3. Calculate cubic feet and cubic yards
For a rectangular area:
Volume (cubic feet) = Length (ft) × Width (ft) × Depth (ft)
Convert depth from inches to feet by dividing inches by 12. Then convert cubic feet to cubic yards by dividing by 27, because one cubic yard contains 27 cubic feet.
4. Worked driveway example
Suppose a rectangular driveway is 20 feet long and 10 feet wide, and the gravel layer is 3 inches deep. Convert the depth: 3 ÷ 12 = 0.25 feet. The base volume is 20 × 10 × 0.25 = 50 cubic feet. Divide by 27 to get about 1.85 cubic yards.
If you choose a 10% planning allowance, multiply 1.85 by 1.10. The result is about 2.04 cubic yards to plan for. This allowance is an estimate, not a substitute for measuring an uneven site.
5. Estimate weight and delivery cost
Gravel weight varies with stone type, particle size, moisture and compaction. If your supplier provides a bulk density in pounds per cubic foot, multiply the volume in cubic feet by that density to estimate pounds. Divide pounds by 2,000 to convert to US short tons. For a metric quote, use the supplier’s metric density and tonne units.
Use the Calclio Gravel Calculator to calculate rectangular or circular coverage, add waste, estimate weight and enter a quoted price per short ton. Adjust the density input to match the supplier’s material data.
Before you order
- Confirm whether the supplier sells by cubic yard, short ton, metric tonne or bulk bag.
- Ask whether the quote includes delivery and minimum-load charges.
- Check the correct depth and base preparation for the intended use.
- For sloped or uneven areas, take measurements at several points and ask the supplier or contractor to review the estimate.
Frequently asked questions
How many cubic yards are in 50 cubic feet?
50 ÷ 27 is approximately 1.85 cubic yards.
Does gravel depth affect weight?
Yes. Increasing depth increases volume and therefore increases estimated weight for the same material density.
Is the calculator’s density exact?
No. Density is an editable assumption. Use the quarry or landscape supplier’s value for the actual material being delivered.
For more material estimates, try the Concrete Slab Calculator or the Deck Material Calculator.