Contact
One address for everything, read by the person who builds the calculators.
Last updated November 10, 2026
Write to [email protected]. Replies usually come within two working days.
Reporting a wrong result
Every calculator page has a Send feedback link under the result, which starts an email with the calculator's name in the subject. If you can, paste the address from the Share link button into the message: it reopens your exact calculation, so the problem can be reproduced. Say what you expected and where the figure comes from (a bank statement, another calculator, a textbook).
Confirmed mistakes are fixed and a test is added so they cannot come back. How we calculate explains the formulas and conventions each calculator follows.
Suggesting a calculator or a language
Tell us what you were trying to work out and which country or currency it is for. Calculators that many people ask for are built first.
Privacy and advertising
For questions about data, cookies or the ads on this site, use the same address, or start a privacy email. The privacy policy and the cookie policy describe what is collected and how to opt out.
What we cannot help with
CALCSLIP gives general estimates, not financial, tax, legal or medical advice, and cannot review personal documents or loan offers. For those, a qualified adviser is the right person.