Contact us

Questions, corrections and ideas for new tools are all welcome. If a result looks off, tell us which tool you used and what you entered, and we'll check it.

We read every message and usually reply within two business days.

Corrections go straight to our editor, Khuwalid Khalid, who checks every report against the calculator and its sources.

Contributions

If you'd like to contribute a guide or suggest a collaboration, use the same address with "Contribution" in the subject line. We only publish content that's genuinely useful to our readers.