Calculate how much concrete you need in m³ and 20kg bags. Covers slabs, footings, posts, and pathways.
Calculate how many deck boards, joists, posts and screws you need for any NZ deck. Covers timber and composite.
Calculate the annual depreciation deduction for your tools and equipment using the IRD diminishing value method.
Calculate posts, rails, palings, and concrete needed for any NZ fence. Covers timber paling, post-and-rail, and Colorbond.
Add or remove 15% GST instantly. Works for any NZ tradie invoice or quote.
Work out what to charge per hour based on your target income, overheads, and billable hours. Includes ACC levy estimates.
Calculate job costs, apply your markup, and produce a quote price with GST for NZ tradie jobs — with regional labour rates by city.
Convert between markup percentage and gross margin percentage — a common source of confusion that can cost tradies thousands.
Calculate how many litres of paint you need for walls, ceilings, and exteriors. Works for any NZ room or house.
Calculate actual roof area from your house footprint and roof pitch. Works for gable, hip, and skillion roofs.
Calculate how many tiles you need for floors, walls, or splashbacks. Includes wastage and grout estimates.
Calculate your IRD mileage reimbursement or tax deduction using the 2024-25 NZ mileage rates.