Mulch Calculator
Work out how many cubic metres or bags of mulch you need for your garden beds, by area and spread depth.
| Bulk mulch (incl. 5% allowance) | 1.80 m³ | $113 |
| Or bagged (25L) | ≈72 bags | |
| Delivery | $90 |
How we estimate this
Mulch is sold by the cubic metre or in bags. This calculator multiplies your bed area by the spread depth (usually 50–75mm) to give the volume.
Pricing reviewed: October 2026.
Pricing reviewed October 2026. Indicative Australian costs, not a quote.
Understanding mulchs in Australia
Mulch is sold by the cubic metre or in bags. This calculator multiplies your bed area by the spread depth (usually 50–75mm) to give the volume.
Bulk delivery is cheaper for larger gardens; bags suit small top-ups. A deeper layer suppresses weeds better but uses more mulch.
Frequently asked questions
How much mulch do I need?
Multiply your garden bed area by the depth, e.g. 24m² at 75mm needs about 1.8m³. The calculator converts to bags for small jobs.
How deep should mulch be?
About 50–75mm is ideal, enough to suppress weeds and retain moisture without smothering plants.
Is bulk mulch cheaper than bags?
Yes, bulk delivery is far cheaper per cubic metre. Bags suit small top-ups only.
Are you a material supplier or hardware store?
Everyone on this page is working out what mulch costs because they are ready to hire. Put your business right beneath the calculator, in your state, so you are who they find. From $50/mo.