Building & DIY Calculators
10 free building & diy calculators for New Zealanders.
Estimate materials and costs for paint, carpet, tiles, wallpaper, concrete, roofing, fencing, decking, insulation, retaining walls, and swimming pools — typical NZ rates.
Deck Builder Calculator
Estimate materials and costs for building a deck in NZ. Covers timber and composite options, posts, bearers, joists, and whether you need a building consent.
Fencing Calculator
Calculate materials and costs for a fence — standard 1.8m height in NZ. Covers timber paling, colour steel, and post spacing for residential boundaries.
Paint Calculator
NZ paint calculator: how many litres for walls, ceilings, or exterior. Based on Resene/Dulux coverage (12 m²/L) and standard 1L/4L/10L tin sizes.
Concrete Calculator
Calculate how many cubic metres of concrete you need for slabs, paths, footings, and posts. Includes waste allowance and ready-mix truck load sizes.
Insulation Calculator
Calculate insulation requirements to meet NZ Building Code clause H1. Covers underfloor, wall, and ceiling insulation R-values for your climate zone.
Tile Calculator
Calculate tiles needed for floors, walls, or splashbacks in your NZ home. Includes wastage allowance and grout coverage.
Carpet Calculator
Calculate the carpet you need for a room in square metres or broadloom width (3.66m standard NZ). Includes underlay and wastage.
Roofing Calculator
Estimate roofing materials and costs for longrun iron (corrugate, tray) and tiles. Includes ridging, flashings, and typical NZ roof pitches.
Retaining Wall Calculator
Calculate materials for a retaining wall — timber, concrete block, or gabion. Remember, walls over 1.5 metres in NZ generally require a building consent.
Wallpaper Calculator
Work out how many rolls of wallpaper you need for a room. Accounts for pattern repeat, doors, and windows. Standard NZ rolls are 10m x 0.53m.