Project category
Landscaping calculators
Mulch, gravel, soil and outdoor material calculators.
- Mulch Calculator — Bags vs Bulk Cost AustraliaEnter bed dimensions, depth, bag litres, supplier bulk increment, and optional GST-basis prices to compare independently rounded bag and bulk orders.
- Gravel CalculatorEnter the area dimensions in metres and the gravel depth in millimetres to get the cubic metres and tonnes to order, with wastage and an optional GST-aware cost estimate.
How these landscaping calculators work
Each calculator starts from site measurements in metres and millimetres, converts them with a tested formula, shows the exact quantity and your waste allowance as separate lines, then rounds up to the package or order unit you actually buy. Prices are optional and always entered by you, so the estimate reflects your supplier rather than a national average.
Landscaping measuring guides
Step-by-step guides with worked examples and reference tables for Australia.
- How Much Mulch Do I Need? (Australia, m³ and Bags)How much mulch do I need? Multiply bed area by depth: at 75 mm, 1 m³ covers about 13 m² and each m² takes 1.5 × 50 L bags. Bulk versus bag cost maths included.
- How Much Road Base Do I Need? (Australia, m³ to Tonnes)How much road base do I need? Multiply area by compacted depth, add about 20% for compaction, then multiply by your yard's density (about 1.9 t/m³) for tonnes.