10 Free Construction Calculators Every Australian Tradie Should Use

Stop doing manual maths on the back of a Bunnings receipt. These 10 free calculators save 2–3 hours a week on quoting and material estimates.

1. Decking Calculator

Enter deck dimensions → get number of boards, joists, screws & total timber cost in 30 seconds.

2. Contractor Rate Calculator

Input your costs (super, insurance, vehicle) → see your break-even rate and recommended charge-out rate.

3. GST Calculator

Add or subtract GST instantly. Built for Australian 10% GST rate.

4–10: More Essential Calculators

1. Concrete Calculator: m³ needed for slabs, paths & footings
2. Gravel/Road Base Calculator: Tonnes for driveway base & drainage
3. Contractor Pay Calculator: Take-home pay after tax & expenses
4. Paving Calculator: Pavers + sand/cement for any area
5. Retaining Wall Calculator: Blocks, gravel & capping
6. Paint Calculator: Litres per coat by surface area
7. Timber Fence Calculator: Posts, rails & palings