Built by a New Zealander,
for the world
Numly started as a simple idea — why isn't there one calculator site that actually gets the numbers right for New Zealand?
Most calculator websites are built for the US or UK and use outdated tax rates, wrong currencies and irrelevant examples. As a New Zealander I was frustrated — every mortgage calculator showed £ and every tax calculator was wrong.
So I built Numly. Starting with NZ-specific calculators and expanding to cover 7 regions with locally accurate tax rates, currencies and regulations. Every calculator is reviewed for accuracy and updated when laws change.
Today Numly has 470+ calculators across 34 categories — from mortgage and tax calculators to engineering tools, trading calculators and clinical scoring for healthcare workers.
What makes Numly different
Region-aware
Real tax rates, correct currencies, local regulations for NZ, AU, UK, US, CA and EU. Not just US defaults with a currency swap.
Expert-reviewed
Calculators reviewed by professionals in finance, engineering, health and law. Sources cited, formulas shown.
Always accurate
Tax rates and rules updated when legislation changes — NZ Budget, UK Budget, ATO updates — not just set and forgotten.
Free forever
Core calculators are and always will be free. No tricks, no paywalls on the basics. Numly Pro unlocks professional tools.
Get in touch
Found a bug? Have a suggestion? Want to collaborate? We'd love to hear from you.
hello@numlyapp.com →