Trade Tools & Quantity Calculators

Concrete Calculator — NZ

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.

Tile Calculator — NZ

Calculate how many tiles you need for floors, walls, or splashbacks in NZ. Includes wastage percentage, grout quantity, and adhesive estimates.

Paint Calculator — NZ

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.

Brick & Block Calculator — NZ

Calculate how many bricks or blocks you need for a wall, plus mortar and sand quantities. NZ standard brick and block sizes.

Timber Framing Calculator — NZ (Studs, Plates & Lintels)

Calculate timber framing quantities for NZ wall, floor, and roof framing — studs, top plates, nogs, lintels, and total lineal metre estimates.

Roof Area Calculator — NZ

Calculate actual roof area from your house footprint and roof pitch in NZ. Works for gable, hip, and skillion roofs with material takeoff output.

Decking Calculator — NZ

Calculate how many deck boards, joists, posts and screws you need for any NZ deck. Covers both timber and composite decking with cost estimates.

Fence Calculator — NZ

Calculate posts, rails, palings, and concrete needed for any NZ fence. Covers timber paling, post-and-rail, and Colorbond.

Staircase Calculator — NZ (Rise, Run & Dimensions)

Free NZ staircase calculator — enter floor height to get step count, rise, going, and total run compliant with NZ Building Code. Instant results.

Cable Sizing Calculator NZ — Single & 3 Phase

Free NZ cable sizing calculator for single and three phase circuits — current capacity, voltage drop, and circuit breaker sizing.

NZ Voltage Drop Calculator — AS/NZS 3000 Wiring Rules

Calculate voltage drop percentage for NZ residential and commercial electrical installations per AS/NZS 3000:2018 Wiring Rules.

Drain Grade & Pipe Slope Calculator — NZ

Free NZ drain grade calculator — instant pipe gradient, fall and minimum slope for any pipe length. Meets NZ plumbing code. No signup required.

NZ Stormwater & Wastewater Pipe Grade Calculator

Free NZ stormwater pipe grade calculator — check minimum fall, pipe slope and E1/E2 Building Code compliance for stormwater and foul drainage. Instant.

Retaining Wall Calculator — NZ

Estimate retaining wall materials and costs for NZ — concrete blocks, timber, or keystone. Includes drainage aggregate, consent thresholds, and labour.

NZ Retaining Wall Soil Pressure Calculator

Calculate active soil pressure and surcharge loads on retaining walls — and check whether engineering sign-off is required under NZ Building Code B1.

Earthworks & Excavation Calculator — NZ

Free NZ earthworks calculator — estimate excavation volumes, soil disposal costs and fill requirements for building sites, driveways, footings and foundations.

Irrigation System Calculator — NZ

Calculate irrigation pipe lengths, sprinkler head spacing, flow rates, and total system cost for NZ gardens, lawns, and lifestyle blocks.

Paving Calculator — NZ (Pavers, Base & Sand)

Calculate how many pavers, base course, and sand you need for a NZ paving project. Includes material and labour cost estimates per square metre.

Scaffolding Cost Calculator — NZ

Free NZ scaffolding cost calculator — estimate hire costs by perimeter, height and duration for residential and commercial jobs. 2026 rates.