Free NZ tradie quantity calculators — concrete, tiles, timber, paint, cable sizing, drainage, scaffolding, earthworks and more.
Free NZ concrete calculator — work out how much concrete you need in cubic metres and 20kg bags for slabs, footings, post holes, paths and driveways.
Calculate how many tiles you need for floors, walls, or splashbacks in NZ. Includes wastage percentage, grout quantity, and adhesive estimates.
Calculate how many litres of paint you need for walls, ceilings, and exteriors. Works for any NZ room or house size with a wastage allowance.
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, lintels, and total lineal metre estimates.
Calculate actual roof area from your house footprint and roof pitch in NZ. Works for gable, hip, and skillion roofs with material takeoff output.
Calculate how many deck boards, joists, posts and screws you need for any NZ deck. Covers both timber and composite decking with cost estimates.
Calculate posts, rails, palings, and concrete needed for any NZ fence. Covers timber paling, post-and-rail, and Colorbond.
Free NZ staircase calculator — enter floor height to get step count, rise, going, and total run compliant with NZ Building Code. Instant results.
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.
Free NZ drain grade calculator — instant pipe gradient, fall and minimum slope for any pipe length. Meets NZ plumbing code. No signup required.
Free NZ stormwater pipe grade calculator — check minimum fall, pipe slope and E1/E2 Building Code compliance for stormwater and foul drainage. Instant.
Estimate retaining wall materials and costs for NZ — concrete blocks, timber, or keystone. Includes drainage aggregate, consent thresholds, and labour.
Calculate active soil pressure and surcharge loads on retaining walls — and check whether engineering sign-off is required under NZ Building Code B1.
Free NZ earthworks calculator — estimate excavation volumes, soil disposal costs and fill requirements for building sites, driveways, footings and foundations.
Calculate irrigation pipe lengths, sprinkler head spacing, flow rates, and total system cost for NZ gardens, lawns, and lifestyle blocks.
Calculate how many pavers, base course, and sand you need for a NZ paving project. Includes material and labour cost estimates per square metre.
Free NZ scaffolding cost calculator — estimate hire costs by perimeter, height and duration for residential and commercial jobs. 2026 rates.