Measuring guide
How to measure irregular areas for gravel
Break awkward areas into simpler measurements before estimating volume and weight.
A practical way to split irregular gravel areas into simpler shapes before calculating coverage.
Split the shape
The calculator uses length and width, so irregular spaces are easiest to handle by splitting them into rectangles or estimating an average width.
- Measure each rectangle separately.
- Add the areas together before calculating depth.
- For curves, use an average width and add a sensible allowance.
Record your assumptions
A clear note of the measurements helps when comparing supplier quotes or checking the result later.
- Write down each section's length and width.
- Mark the intended depth.
- Note any areas excluded by steps, drains, planters, or borders.
Irregular measuring methods
| Shape | Simple method | Caution |
|---|---|---|
| L-shaped area | Split into two rectangles | Do not count the overlap twice. |
| Curved border | Use average width | Add allowance for uncertainty. |
| Mixed patio gaps | Measure each gravel section | Exclude paving stones or fixed features. |
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.