Contact
We're happy to hear from you — whether it's a calculator you're missing, a bug you've spotted, or a question about the site.
We usually reply within a few business days.
What to Include
- Bug reports: which calculator, what you entered, and what you expected — a screenshot helps enormously.
- Calculator requests: tell us the problem you're trying to solve; the best tool ideas come from real situations.
- Corrections: if a formula or explanation looks off, point us to a source and we'll verify and fix it.
Legal & Privacy Inquiries
For GDPR requests and legal matters, see our Privacy Policy and Imprint, or write to the email above with "Privacy" in the subject line.