Contact
We read every message and usually reply within a few business days.
[email protected] — for questions, corrections, data requests and partnership enquiries.
Reporting a wrong result
If a calculation looks wrong, tell us the calculator name, the values you entered and what you expected. That is the fastest way to get a fix released.
Advertising and partnerships
For sponsorship or advertising enquiries, write to the same address with “Partnership” in the subject line.
Security
If you believe you found a security issue, report it to [email protected] instead of posting it publicly.