About CalculaBoa
CalculaBoa is a collection of everyday tools that just work: free, no sign-up and no usage limits.
Why we exist
Many online tools ask you to log in after a few uses, hide results behind ads or use outdated tables. Here, results update as you type and every calculation is explained.
Who we are
CalculaBoa is a InLoop project. Reach us at [email protected].
How we stay free
The site is supported by advertising and, on some pages, clearly labelled partner links. This never changes a result.
How we calculate
Every figure comes from an official source whenever one exists, and every tool shows the source and date of the table it uses. If you spot a mistake, use the report link on every tool page.
Last updated: November 12, 2026