About Queendom Tools

Queendom Tools is a collection of free calculators and converters that run in your browser, most of them for engineering and science, plus a few for everyday use.

Who is behind it

Queendom Tools is built and run by Daniel, an independent developer based in Rome, Italy.

How the pages are made

The calculators use formulas from published standards, handbooks and textbooks, and the pages are drafted with the help of AI models. We review them, but mistakes can slip through.

If you find one, please tell us through the contact page, with the page address and the values you entered: we read every report.

Use with care

Results are estimates for learning and planning. Engineering, financial and health-related results are not a substitute for a qualified professional who knows your situation.

Everything you type is processed in your browser: see the privacy policy. The full list of tools is on the home page.