About this calculator
Gravel for paths, driveways, patios and drainage, as cubic metres and tonnes, with weed control fabric under it.
How it’s calculated
Volume = area × depth. Weight = volume × density (about 1.5–1.7 t per m³ for most gravel).
Worked example
With these inputs:
- Area shape
- Rectangle
- Length
- 6 m
- Width
- 3 m
- Depth
- 50 mm
- Material
- Crushed stone 19 mm
- Extra for settling / compaction
- 5%
the result is:
- Volume
- 0.95 m³
- Area
- 18 m²
- Approx. weight
- 1.56 t
- To order
- 1 cube (rounded up to half cubes)
Tips from the trade
- Lay decorative stone over a firm, compacted base so it doesn’t sink or spread.
- Edging stops gravel creeping into lawns and beds.
- Stone is sold by the cube (1 m³) and half cube, but trailers and bakkies are limited by weight, so check both figures.
Common questions
How much does a cubic metre of gravel weigh?
About 1.5–1.7 tonnes, depending on the stone and how wet it is.
How far does a cube of stone go?
About 20 m² at 50 mm deep, or 13 m² at 75 mm (1 m³ ÷ depth).
Results are estimates for planning and pricing. Check quantities against your drawings, the manufacturer’s data and SANS 10400 (the National Building Regulations) and your local municipality before ordering.