About Countfolk

Countfolk is an independent publisher of free online calculators covering personal finance, health, and everyday arithmetic.

Each calculator is built from a written specification, tested against known reference values before publication, and reviewed on a periodic basis. Every page states the formula used and the assumptions the result depends on.

All calculations run in your browser. Figures you enter are not transmitted to or stored by Countfolk.

The calculators and accompanying articles are provided for general informational purposes only and do not constitute financial, legal, medical, tax, or other professional advice. See the Terms of Use.