Work out how much gravel, slate or decorative chippings you need for paths, driveways and borders — and whether to add stabilising grids and a weed membrane underneath.
Allow 10 litres per m² per centimetre of depth. Paths usually want 4–5cm of gravel; driveways need 10cm or a grid system to stop rutting.
01 — The Calculator
Pick a material, pace out your plot, and the value engine prices every way to fill it — hippo bags, dumpy bags or handy sacks.
5 cm
Depth changes the volume a lot — 5cm mulch is normal, raised veg beds want 20cm+.
Not sure? See the depth guide belowEnter dimensions to calculate.
Volume
0 litres
Cubic
0.00 m³
Area
0.0 m²
Est. weight
0.00 tonnes
Enter your plot dimensions and the value engine will price the cheapest way to cover it.
Worked example: garden path
A path 4m × 1m at 5cm deep needs 4 × 5 × 10 = 200 litres. That's 8 handy 25L bags, or well within one bulk bag if you're covering a larger area — the calculator prices both.
4–5cm is enough for footpaths. Driveways need around 10cm, ideally laid over a compacted MOT type 1 sub-base.
Garden Calculator — Project
My garden project · 20 September 2026
| Item | Qty | Each | Total |
|---|---|---|---|
| Estimated total | £0.00 | ||
Prices from the Garden Calculator sample trade catalogue — confirm with your merchant before ordering.