Mulch Calculator for Australian Gardens
Estimate mulch volume for garden beds, pathways and landscaping projects. See cubic metres first, plus indicative weight and ordering equivalents.
Calculate Your Mulch
Editable presets only — confirm the required depth for your project
Total Volume
Volume: Length × Width × Depth (converted to metres). For circles: π × radius² × depth. For triangles: ½ × base × height × depth.
Weight: Volume × the selected indicative density. Confirm the exact product conversion with the supplier; see Methodology & Sources.
20 kg equivalent: Estimated kilograms ÷ 20, rounded up. This is a mass comparison, not a retail pack count.
1 m³ bulk-bag equivalent: Volume ÷ 1.0, rounded up. Confirm the supplier's actual bulk-bag size.
Calculate Mulch Volume Before You Order
Enter the measured shape, dimensions and required depth. LandscapeCalc converts millimetres to metres and calculates cubic metres without adding a hidden waste or settlement allowance.
Volume Is the Primary Result
Australian landscape yards commonly quote loose mulch by volume. Split irregular beds into simple rectangles, circles or triangles, calculate each section, and add the cubic-metre results. Subtracting trunks or small plants is usually less reliable than measuring the actual area you intend to cover.
Material Choice Changes the Weight Estimate
Selecting wood chip, bark, pine bark or another mulch changes only the indicative weight coefficient. It does not change the measured volume. Organic material varies with moisture, particle size and composition, so use the supplier's product conversion when one is available.
Depth Is Your Input, Not Our Recommendation
The depth buttons are editable starting points. Enter the depth specified for the selected product and project; LandscapeCalc does not decide plant, fire, termite or installation requirements.
Check the Result With the Supplier
Before purchase, confirm whether the supplier sells loose cubic metres, litre bags or a particular bulk-bag size. See every formula, coefficient and rounding rule on the Methodology & Sources page.