Contact
Questions, corrections and feedback are always welcome.
For bugs, suggestions, corrections or anything else, write to:
What happens next
Emails are read personally by the person who built the site. You can expect a reply within 2–3 days.
If you find a wrong number or a formula that looks off, mention which calculator or page it was and the inputs you used. That helps us reproduce and fix it quickly.
This site is free to use. If it has saved you time or money, you can also support it with a small donation: Donate Me.