Estimate driveway gravel volume by multiplying the area by the planned layer depth. For a rectangular section, use length × width × depth. Convert inches of depth to feet before calculating cubic feet; divide cubic feet by 27 to get cubic yards. Tonnage needs one more input: the bulk density of the material being delivered.
Break the driveway into measured sections
Measure the area that will receive gravel, not automatically the whole property or driveway approach. For a curved or irregular driveway, divide the plan into rectangles or other simple shapes, calculate each volume, and add the results. Keep separate layers separate if they use different materials or depths.
Example: A rectangular section 24 feet long and 10 feet wide with a planned 4-inch layer has an area of 240 square feet. Its volume is 240 × (4 ÷ 12) = 80 cubic feet, or about 2.96 cubic yards. This is the geometric volume for the entered dimensions before an allowance.
Why cubic yards and tons can differ
Cubic yards describe volume. Tons describe weight. To estimate weight, multiply cubic feet by the material’s bulk density in pounds per cubic foot, then divide pounds by 2,000 for US short tons. The density depends on the aggregate and its condition, including grading and moisture. A generic preset can help with early planning but is not a supplier specification.
Ask the supplier which density or delivered weight basis is appropriate for the exact material. Compaction can also change the loose depth needed to achieve a finished layer. Do not treat a simple geometric estimate as a road-base design or a compaction calculation.
Use the calculator with project inputs
Enter the measured footprint and planned depth in the Gravel Calculator, then select or enter a density to see an estimated tonnage. If the driveway has several sections, calculate them individually and total the order quantities after checking supplier minimums and delivery increments.
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