Contact us
Found a wrong number? Want a calculator we don't have? Email us — a human reads everything.
General: [email protected]
Support: [email protected]
Security: [email protected]
We reply to most messages within a couple of days. For error reports, include the calculator URL and what you expected — screenshots welcome.
What to write in about
- Corrections: a number that looks off, a product spec that changed.
- New calculator ideas: if you needed it and couldn't find it, others need it too.
- Advertising & partnerships: media kit available on request.
- Privacy requests: see the privacy policy — short version: we don't collect personal data, so there's usually nothing to delete.