Garden paths
Decorative paths may use a relatively shallow gravel layer. Consider the underlying soil, edging, and whether pedestrians need a firm walking surface.
Gravel Calculator
Calculate how much gravel you need for a garden path, driveway, patio base, drainage layer, or landscaping project. Estimate the area, volume, order quantity, and approximate material weight.
Calculate Your Gravel Requirements
Fill in the area dimensions and desired depth. All dimensions must use the same unit. The calculator converts your measurements to meters before calculating the final volume.
How to Calculate Gravel Volume
Gravel volume depends on the surface area and the depth of the gravel layer. First calculate the area using the appropriate geometric formula, then multiply the area by the required depth.
Rectangular area
Area = length × width
Circular area
Area = π × radius²
Triangular area
Area = base × height ÷ 2
Base gravel volume
Volume = area × depth
Estimated order volume
Base volume × (1 + compaction % / 100) × (1 + waste % / 100)
Estimated material weight
Order volume × bulk density
Example: gravel for a garden path
A path that is 10 meters long and 1 meter wide has an area of 10 m². At a gravel depth of 0.10 meters (10 cm), its base volume is 1 m³. With a 5% compaction allowance and a 10% waste allowance, the estimated order quantity is 1.155 m³.
Choosing the Right Gravel Depth
The appropriate depth depends on the gravel type, ground conditions, intended use, and whether the installation has a compacted sub-base. These examples are general planning guides, not structural specifications.
Driveways
Driveways typically require appropriate sub-base preparation and sufficient compacted depth to support vehicle loads. Check local ground and construction requirements.
Landscaping beds
Decorative gravel depth depends on the stone size, weed-control approach, drainage needs, and the appearance you want to achieve.
Frequently Asked Questions
How much gravel do I need?
Multiply the surface area by the gravel depth to find the base volume. Then account for compaction and waste if those allowances are appropriate for your project.
How many cubic yards are in one cubic meter?
One cubic meter is approximately 1.308 cubic yards. The calculator provides both units to help compare supplier quotations.
How accurate is the weight estimate?
Weight depends on the material's actual bulk density, grading, and moisture. The default value of 1,600 kg/m³ is only an illustrative estimate. Ask your supplier for the relevant density.
Does the calculator account for an irregular area?
This version supports rectangular, circular, and triangular areas. For an irregular shape, divide it into smaller supported shapes, calculate each separately, and add the volumes together.
Is the compaction allowance the same as waste?
No. The compaction allowance is intended to account for material settling or compacting, while the waste allowance covers material losses and practical installation differences. Actual requirements vary by project.