Free tool for homeowners
DIY material calculators
Concrete volume with bag counts and weight, paint coverage with primer and two topcoats, plus tile boxes and grout kilograms - with wastage buffers built in.
Guideline only. Not financial, tax, or legal advice.
Slab or path size
Guideline only. Includes an automatic 10% wastage buffer. Formulas follow the Built Simple Concrete Bag Calculator (20 kg bag ≈ 0.009 m³, ~108 bags per m³).
Concrete needed
- Net volume
- 1.80 m³
- Order with 10% waste
- 1.98 m³
- 20 kg premix bags
- 221
- Estimated wet weight
- 4,752 kg
≈ 0.009 m³ yield per bag (~108 bags / m³)
Guides and further reading
Use these sources to check current benchmarks and formulas. Our tools are guidelines only - not quotes or professional advice. Swiftscope does not endorse third-party advice beyond linking the reference.
- Built Simple Concrete Bag Calculator
Formulas and 10% wastage buffer. Standard 20 kg pre-mix yield is about 0.009 m³ (~108 bags per m³).
- Dulux Wash&Wear coverage guide
Australian interior acrylic spread rates commonly guide around 14-16 m²/L per coat (product can lists the exact rate).
- Dulux paint calculator
Coat calculation guidance for walls, primer, and topcoats.
- Built Simple Paint Calculator
Wall area, coats, and coverage formulas with Australian interior rates.
- Beaumont Tiles measuring guide
Measurement standards and recommended waste allowance for cuts and breakages.
- Showtile Tile Calculator Guide
Industry practice of adding a 10%-15% buffer on net wall/floor area for edge cuts and breakage.
Realised the heavy lifting is bigger than you thought? Pass the job to a local tradie.