Contact Us

We would love to hear from you — whether you spotted a number that looks off, want a new calculator, or just want to say hello. Fill in the form below and your message will be saved directly to our inbox.

Report a calculation issue

Found a figure that does not look right? Choose “Report a calculation issue” as the subject and tell us the calculator, the inputs you used, and what you expected — accuracy is our top priority.

Advertising & partnerships

Choose “Advertising / partnership” as the subject and tell us about your proposal.