About this calculator
How much mulch or bark you need for beds and borders, in cubic metres for bulk delivery.
How it’s calculated
Volume = area × depth. 1 m³ = 1,000 litres.
Worked example
With these inputs:
- Area shape
- Rectangle
- Length
- 6 m
- Width
- 3 m
- Depth
- 75 mm
- Material
- Bark mulch
- Extra allowance
- 0%
the result is:
- Volume
- 1.35 m³
- Area
- 18 m²
- Approx. weight
- 540 kg
- To order
- 1.5 cubes (rounded up to half cubes)
Tips from the trade
- 50–75 mm is the usual depth for weed suppression.
- Keep mulch a hand’s width clear of trunks and stems.
- Mulch breaks down over time, so plan to top it up.
Common questions
How much mulch for 10 m² at 75 mm?
0.75 m³ (10 × 0.075 m). Buying by the half cube, order 1 m³.
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.