Calculate how much gravel you need for driveways, paths, patios and landscaped areas. See volume, equivalent units and every active assumption.
Transparent calculationsFormula and assumptions shown
Metric & imperialCompatible mixed units
Every projectDIY to commercial planning
No account requiredInputs remain in your browser
Enter your project dimensions.
Calculated quantities for your project.
Enter your measurements and calculate to see the result.
Measure the surface area that gravel will cover, then use the intended layer depth. Split irregular spaces into simple rectangles, circles or triangles rather than relying on one rough maximum measurement.
Multiply length by width to obtain the surface area. The calculator then multiplies that area by the entered depth after converting each measurement to metres.
For a circle, measure the diameter through the centre. For a triangle, enter the base and the perpendicular height—not a sloping edge.
Calculated volume describes the space the gravel must occupy. An allowance increases that volume by the exact percentage you select and is never applied invisibly.
Weight cannot be established from volume alone. Gravel bulk density changes with grading, moisture, particle size and void space. Enter a density supplied for the exact product if a weight estimate is useful.
Confirm whether the supplier sells by volume, mass or a stated package size. For large or specification-led work, ask whether the supplied figures describe loose or compacted material.
A measured area is 5 m long and 3 m wide, with a planned depth of 10 cm. Convert 10 cm to 0.10 m, then calculate 5 × 3 × 0.10 = 1.50 m³. If the user deliberately selects a 10% allowance, the calculator adds 0.15 m³, producing a total calculated volume of 1.65 m³. No weight should be stated until a density for the exact supplied product is entered.
BulkMeasure does not recommend one universal gravel depth. The appropriate construction depends on the project, sub-base, loading, drainage, product grading and local practice. Enter the depth required by the project specification or agreed with the supplier or contractor.
Settlement and compaction are not the same as a general ordering allowance. If a design requires a compacted finished layer, obtain a product-specific conversion or compaction factor rather than guessing. Keep that factor separate from an allowance for trimming, spillage or uneven ground.
Suppliers may quote loose volume, mass, bulk bags or smaller bags. Those descriptions are not interchangeable without the supplier's stated density or package capacity. Use the calculated volume as the stable starting point, then compare it with the units on the actual quotation.
If a supplier provides a density in kilograms per cubic metre, enter it to obtain an estimated mass. BulkMeasure deliberately has no default gravel density: grading, moisture and void space can materially change the conversion.
Only if you enter an allowance. The breakdown shows the base volume and the additional amount separately.
Weight requires bulk density, which varies by product and condition. Enter a supplier-provided density for the exact gravel if you need an estimated mass.
Yes. Select the unit beside each measurement; the engine converts compatible units before calculating.
Enter the depth required by your design or specification. If the finished depth is compacted, obtain product-specific ordering guidance rather than relying on an unsupported general factor.
How to measure an area explains the supported shapes. Volume, density and weight explains why mass is conditional. The geometry and unit conversions are mathematical; no third-party gravel density, package size, recommended depth or coverage claim is used in this proof.