Contact
Response time
We reply within 5 business days. Questions about a specific calculator or table — including pointing out an outdated source or a calculation error — get priority.
What to include
To get a faster answer, include:
- the link to the page you are writing about;
- for a calculation error, the values you entered and the result you saw;
- for a source suggestion, the link to the official document.
Other channels
There is no contact form and no other channel yet — only the email address above.
Data requests
For requests about your personal data (access, correction, deletion), use the same address — see the Privacy Policy for details.
Updated on August 20, 2026.