Contact
CalcInterest is run by one person — Luiz Torres, a software developer — so every message lands in a real inbox and gets read by the person who wrote the code and the guides.
Found a wrong number in a calculator?
That is the message I most want to receive. Include the exact inputs you entered — principal, rate, years, compounding frequency, and any monthly contribution — plus the result you got and the result you expected. With those five values I can reproduce the calculation immediately and fix any genuine bug.
Spotted an error in a guide?
Send the link to the article and quote the sentence or figure you believe is wrong. Corrections are made directly in the article, and the updated date on the post reflects when the fix went live. See the editorial standards page for how content on this site is researched and corrected.
One thing I cannot help with
Please do not send questions about what you personally should do with your money — which account to open, which fund to buy, how to invest an inheritance. I am a developer, not a licensed financial advisor, and this site is educational only. For personal decisions, talk to a qualified professional.