The Smarter Way to Do
Construction Maths
200+ free calculators for concrete, brickwork, timber, roofing, paint, labour and project estimating. Metric and imperial. Works on any device, on any job site.
Browse by Category
12 specialist categories. Every calculator free, instant and mobile-ready.
Most Used Calculators
The tools contractors reach for every day.
Why ContractorMaths?
Built for professionals who need the right answer fast — on site, in the ute, or in the office.
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Frequently Asked Questions
Common questions about ContractorMaths.
ContractorMaths is a free library of 200+ construction calculators for contractors, builders, tradies and construction professionals worldwide. Every tool is free, instant and requires no sign-up or account.
Yes — most calculators include a metric/imperial toggle so you can switch between metres/kilograms and feet/pounds instantly. ContractorMaths is designed for global use by construction professionals in Australia, the US, UK, Canada and anywhere else.
Yes — 100% free, no catch. Every calculator works without a sign-up, paywall or hidden fee. We believe construction professionals deserve accurate tools without jumping through hoops.
12 categories: Concrete & Foundations, Masonry & Brickwork, Timber & Framing, Roofing & Cladding, Paint & Coatings, Earthworks & Landscaping, Plumbing & Drainage, Electrical, Project Cost & Estimating, Labour & Productivity, Area/Volume/Geometry, and Steel & Structural.
Every calculator uses industry-standard formulas verified against Australian Standards, NCC requirements and international construction practice. Results are estimates for planning and quoting purposes. Always verify structural and safety-critical calculations with a qualified engineer.