About LandscapeCalc
A free online calculator built for Australian homeowners and landscapers.
Last reviewed: 3 September 2026
What LandscapeCalc does
LandscapeCalc is a free set of browser-based planning calculators for Australian homeowners and landscapers. The tools convert an area and user-selected depth into cubic metres for mulch, soil, gravel, sand and road base.
Cubic metres are the primary ordering result. Estimated weight is secondary because moisture, grading, compaction and each supplier's product can change the actual density. The 20 kg and 1 m³ figures are clearly labelled equivalents, not a promise that a supplier sells the selected material in those pack sizes.
How the estimates are maintained
The formulas, material coefficients, rounding and known limitations are published on the Methodology & Sources page. Source checks are dated, and uncertain product or installation claims are removed rather than presented as universal Australian rules.
The depth buttons are editable conveniences only. LandscapeCalc does not decide the required depth, product, compaction, drainage, structural design or vehicle load for a project. Use the requirements supplied by your designer, installer, product manufacturer or landscape yard.
What happens to your inputs
Calculator inputs and results are processed in your browser. LandscapeCalc does not operate a server-side calculator database or receive the dimensions you enter. Analytics and advertising are described in the Privacy Policy.
Independence
LandscapeCalc is not affiliated with a landscape supplier, quarry or material manufacturer. It does not sell materials or receive supplier commissions. External supplier links on the methodology page are citations, not endorsements.
Corrections and feedback
If a formula, coefficient, label or source appears wrong, use the Contact page. Include the calculator page, selected material and inputs so the result can be reproduced.