Builder tools
Home improvement calculators for Australia
Every tool uses square metres, AUD pricing fields and GST handling, with formulas that are documented and unit-tested.
Project category
Concrete & Masonry
Volume, slab, footing and masonry material calculators.
- Concrete Slab CalculatorEnter slab dimensions in metres and millimetres to get the cubic metres of pre-mixed concrete to order, with wastage and an optional GST-aware cost estimate.
- Concrete Volume CalculatorEnter your pour dimensions in metres and millimetres — rectangular slabs and footings or cylindrical post holes — to get the cubic metres of pre-mixed concrete to order, with wastage and an optional GST-aware cost estimate.
- Concrete Cost Calculator Australia — Delivered QuoteTurn a current premixed concrete supplier quote into an itemised AUD supply total while keeping physical volume, billed volume, fees and GST separate.
Project category
Flooring & Tile
Flooring, tile and underlay quantity and cost calculators.
- Tile and Grout Calculator with Spacer Width AustraliaEnter the tiled area in metres, tile dimensions and spacer width in millimetres, then use the grout product's matching coverage row. Tile cartons and grout packages are rounded separately.
- Flooring CalculatorEnter your room dimensions in metres to get the square metres of flooring to buy and the number of boxes, with a wastage allowance for cuts and spares.
Project category
Painting & Walls
Paint coverage and wall finish calculators.
Project category
Walls & Insulation
Drywall, plasterboard, stud and insulation calculators.
Project category
Landscaping
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.
Project category
Decks & Fences
Decking, fence post and panel calculators.
- Fence CalculatorEnter your boundary length in metres to get the posts and fence bays to buy — works for timber paling fences and panel systems like Colorbond — with an optional GST-aware cost estimate.
- Decking Calculator — Boards, Joists, and FixingsEnter metric deck dimensions and the approved board, joist, and fixing layout to get boards, joists, regular fixings, whole packs, and optional entered-price cost.