About Numflo
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Numflo is an independent project that builds free financial calculators people can trust. Every calculator gives you the number and explains what it means, in plain language, in English and Spanish.
It started from a simple observation: most calculator websites are English-only, cluttered with ads, and give a bare number with no explanation. Numflo aims to be the opposite: fast, clean, private and genuinely useful.
How the calculators are built: every formula is written from standard financial mathematics and checked by automated tests against independently calculated reference values before each release. Each page shows the formula it uses, a worked example and when it was last reviewed.
How your privacy is protected: there are no accounts and no tracking cookies, and everything you type stays on your device. The code is open source and publicly auditable on GitHub.
Numflo is not a bank, lender or financial adviser, and does not sell financial products. The calculators are tools to help you understand your options; for decisions about your own money, speak to a qualified professional.
Found a mistake, a confusing explanation or a translation error? Please tell us by opening an issue on our public GitHub repository. Every report is read.