Work out how much decorative gravel you need, in tonnes, bulk bags or small bags, for a border, path or driveway.
Area × depth gives the volume of gravel.
We use 1,600 kg/m³, typical for 10–20mm gravel. One bulk bag of about 850 kg covers roughly 10 m² at 50mm.
We add your waste allowance and round up to whole bulk bags. For small jobs we also show 20 kg bags.
These are estimates for ordering materials, not a structural design. Check site conditions, and anything unusual, with a qualified builder or engineer.
40mm for borders and around plants, 50mm for paths and driveways. Deeper than that and it becomes hard to walk or drive on.
Angular 14–20mm gravel locks together and stays put. Rounded pea gravel rolls about under tyres. Lay it over a compacted Type 1 sub-base.
Yes, a weed membrane stops weeds coming through and stops the gravel sinking into the soil. It's cheap and well worth it.
About 10 m² at 50mm deep, or 13 m² at 40mm.