Gravel Calculator
Estimate gravel volume, weight and cost for driveways, paths and landscaping projects.
Estimated gravel needed
How we calculated it
About the Gravel Calculator
A gravel order depends on more than the size of the area; depth can change the quantity dramatically. This calculator turns coverage dimensions and layer depth into cubic volume and can estimate weight when a suitable material density is available.
Depth is usually the input that changes the order most. A driveway base several inches deep can require many times more material than a thin decorative layer over the same area.
How to Use the Gravel Calculator
- Measure the length and width of the area or enter the total coverage area if you already know it.
- Enter the finished gravel depth, making sure inches, centimetres or feet are selected correctly.
- Choose or enter an appropriate material density only if you need a weight estimate.
- Calculate the net quantity, then consider compaction, uneven ground, delivery increments and the supplier’s selling unit before ordering.
How the Calculation Works
For a rectangular area, volume = length × width × depth. The calculator converts all dimensions to compatible units first, then converts the resulting cubic volume to cubic yards or cubic metres as requested.
When a weight estimate is needed, weight = volume × bulk density. Because loose and compacted aggregate can have different densities, the density value should match the material condition represented by the order.
Worked example
Gravel Calculator Worked Example
20 ft × 30 ft area, 3 inches deep
Three inches is 3 ÷ 12 = 0.25 ft. Volume is 20 × 30 × 0.25 = 150 ft³. Divide by 27: 150 ÷ 27 ≈ 5.56 yd³. A 10% allowance would make the planning quantity about 6.12 yd³.
Result guide
Understanding Your Gravel Calculator Result
The cubic-volume result is the clean geometric requirement. If the project needs a compacted finished depth, ask whether the supplier or contractor expects the order to include a compaction allowance.
Before you rely on the answer
Assumptions and Limitations
- The entered depth represents the intended material layer.
- The area is reasonably level or measured in sections where depth changes.
- Weight estimates depend on the bulk density entered and may differ from supplier scale weights.
Practical tip
Using This Result in Practice
For driveways and base layers, measure several depths and use the design depth rather than an average guessed from the edge. Supplier density and delivery quantities are more reliable than a generic tons-per-yard rule.
Related calculations
Useful Calculations to Continue With
Square Footage Calculator — If the coverage area is irregular, calculate the net square footage first and then use that area for the gravel depth calculation.
Concrete Calculator — If the gravel is a base beneath concrete, calculate the concrete separately so the two material layers are not mixed.
Common questions
Gravel Calculator FAQ
How deep should I enter gravel?
Enter the finished or design depth required for the project. Decorative paths, drainage layers and driveway bases can need very different depths.
Why does gravel weight vary by supplier?
Rock type, particle size, moisture and how loosely the material is loaded affect bulk density, so a generic conversion from cubic yards to tons is only an estimate.
Should I add extra for compaction?
If the material will be compacted, the delivered loose volume may need to be greater than the final compacted volume. Use project specifications or supplier advice for the allowance.