Free NZ tradie quantity calculators — concrete, tiles, timber, paint, cable sizing, drainage, scaffolding, earthworks and more.
Calculate how much concrete you need in m³ and 20kg bags. Covers slabs, footings, posts, and pathways.
Calculate how many tiles you need for floors, walls, or splashbacks. Includes wastage and grout estimates.
Calculate how many litres of paint you need for walls, ceilings, and exteriors. Works for any NZ room or house.
Calculate how many bricks or blocks you need for a wall, plus mortar and sand quantities. NZ standard brick and block sizes.
Calculate timber framing quantities for NZ wall, floor, and roof framing — studs, top plates, nogs, and lintels.
Calculate actual roof area from your house footprint and roof pitch. Works for gable, hip, and skillion roofs.
Calculate how many deck boards, joists, posts and screws you need for any NZ deck. Covers timber and composite.
Calculate posts, rails, palings, and concrete needed for any NZ fence. Covers timber paling, post-and-rail, and Colorbond.
Calculate staircase dimensions for NZ Building Code compliance — number of steps, rise, going, and total run.
Calculate the correct cable size for NZ electrical installations — current capacity, voltage drop, and circuit breaker sizing.
Calculate voltage drop percentage for NZ residential and commercial electrical installations per AS/NZS 3000:2018 Wiring Rules.
Calculate pipe gradient, fall, and minimum grade for drainage pipes to NZ plumbing code requirements.
Calculate minimum pipe fall and check compliance with NZ Building Code E1/E2 and AS/NZS 3500.3 drainage standard for stormwater and foul drainage.
Estimate retaining wall materials and costs for NZ — concrete blocks, timber, or keystone. Includes drainage aggregate.
Calculate active soil pressure and surcharge loads on retaining walls — and check whether engineering sign-off is required under NZ Building Code B1.
Calculate excavation volumes, soil disposal costs, and fill requirements for NZ building sites.
Calculate irrigation pipe lengths, sprinkler head spacing, flow rates, and system cost for NZ gardens and lawns.
Calculate how many pavers, base course, and sand you need for a NZ paving project. Includes cost estimates.
Estimate scaffolding hire costs for NZ building projects — residential, commercial, and roof access.