About Free Online Calculator
Free Online Calculator (free-online-calculator.org) is a collection of everyday calculators that run directly in your browser — no installation, no account, no sign-up. From basic arithmetic to loans, salary, taxes, health, and date calculations, we offer practical tools translated into 24 languages.
What we do
Every calculator runs entirely in your browser. Nothing you type is sent to or stored on our servers — once you close or refresh the page, your input is gone.
How formulas and sources are reviewed
Where practical, each calculator explains its formula and the meaning of its inputs. Calculators affected by laws or annual thresholds, such as tax, payroll, and social insurance tools, are reviewed against the stated country and year, with official tables and public guidance preferred as sources. When a governing rule changes, the formula and its explanatory text should be reviewed together.
Limits of the results
Results are estimates based on the values entered and the conditions described on the page. Personal deductions, local rules, contract terms, and rounding practices may produce a different real-world result. Decisions involving tax filings, loans, investments, or medical care should be confirmed with the relevant authority or a qualified professional.
Translations and corrections
Our language versions provide the same core tools, but currencies, units, and regulations differ by country. A translated page does not automatically mean that a calculator reflects every local rule. If an explanation conflicts with the calculation or a rule appears outdated, please report the calculator name, language, and the inputs that produced the issue.
How the site is funded
The site is free to use and supported by Google AdSense advertising. Ad revenue covers hosting costs and lets us keep every calculator free for everyone.
Contact
We welcome bug reports, feature requests, and suggestions for new calculators.