Contact us

Write to us by email. Please use the address below, as contact forms are not available on this site.

What to write about

• A calculation looks wrong. Tell us the tool, the values you entered and the result you expected.
• A new calculator. Describe what it should do and who it would help.
• Your privacy. Ask to see, correct or delete personal data, or to withdraw consent. The privacy policy explains your rights.
• Cookies and saved data. If you want to change your choice, you can do it on the cookie policy page.

Please do not send sensitive information

Do not send passwords, bank details or other sensitive financial information by email. You do not need to include personal data to report a calculator error.