About billycalc
billycalc is a free website with thousands of online calculators and converters: finance, health, construction, math, physics, unit conversion and more. It works in 8 languages, and you do not need to sign up or pay.
Available languages: Русский · English · Español · Português · Français · Deutsch · Italiano · Bahasa Indonesia
The Russian version has the largest catalog; the other languages share thousands of calculators, and we keep adding more.
What you will find
- Calculators that give you the result instantly, with no signup or payment.
- For most calculators, the formula or calculation method explained in plain words.
- Worked examples in many calculators: real numbers, step by step, so you can check the result yourself.
- Embeddable widgets: most calculators can be added to your website for free (see the Terms of Use).
How we check the calculators
- Most calculators use formulas from published sources: official methodologies of regulators and statistical agencies, international standards and recommendations (for example, the WHO for BMI), technical standards and reference handbooks.
- When we create or update such a calculator, we compare its results with worked examples and reference values from those sources and with a manual calculation.
- Some health calculators are simplified educational models. They show a visible warning, are not based on a clinical method and must not be used for diagnosis, dosing or treatment decisions.
- When we find an error — on our own or thanks to a message from a user — we fix the calculator and its description.
- Rules, tax rates and standards differ between countries and change over time. Results are estimates and are not professional advice.
Privacy
Calculations run in your browser: the numbers you enter are not sent to our server. Analytics cookies are used only if you accept them in the cookie banner. More in the Privacy Policy and the Cookie Policy.
Contact
billycalc is an independent project created and maintained by Alex Semensky. Found an error, missing a calculator or want to work with us? Write to [email protected] or use the contact form.
Related: Privacy Policy · Terms of Use · Cookie Policy