Terms of use

These calculators are provided free, as they are, for general use. They are built carefully and each one shows the formula it applies, so you can check the working yourself.

They are not professional advice. Financial calculators do not account for tax, deductions or local rules. Health calculators produce population estimates that may not describe any particular person, and nothing here replaces a clinician. Check anything that matters against a qualified source before acting on it.

If you find an error, please report it — see the contact page.