Depth planning
Driveway gravel depth planning guide
Choose a practical depth before calculating bags, tonnes, or cubic metres.
How to think about gravel depth for driveways, paths, and decorative areas before using a gravel calculator.
Depth depends on use
Decorative gravel, footpaths, and driveways are not the same job. The calculator estimates quantity after you choose a depth.
- Decorative borders often use shallower depths.
- Paths need enough depth to cover the base evenly.
- Driveways may need sub-base and construction guidance before top gravel is added.
Measure the finished surface
Use the length and width of the area that will actually be covered, after edging and borders are set.
- Split irregular areas into rectangles where possible.
- Use average depth when the ground is uneven.
- Allow for settling, edging losses, and compaction.
Depth planning examples
| Project | Typical planning depth | Check before ordering |
|---|---|---|
| Decorative border | 3-5 cm | Weed membrane, edging, and stone size. |
| Garden path | 5-7.5 cm | Base preparation and expected foot traffic. |
| Driveway top layer | Depth varies by build-up | Sub-base, drainage, and vehicle use. |
This is an estimate. Site conditions, compaction, and aggregate type can change the final quantity.
Worked examples
5 x 3 m driveway A starting estimate for a 5 x 3 m area at 5 cm finished depth. 10 x 1 m path A starting estimate for a 10 x 1 m path at 4 cm finished depth. 4 x 4 m area A starting estimate for a 4 x 4 m area at 5 cm finished depth. 6 x 0.5 m border A starting estimate for a 6 x 0.5 m border at 4 cm finished depth.