Have a question, found a bug, or just want to say hi? Email us directly — we read every message, though it may take a few days to respond during busy periods.
hellocoolcal@gmail.comHave an idea for a calculator we don't have yet? Send us a note describing what it should do — we're always looking for new tools to add.
Found a bug, a broken link, or a calculation that looks wrong? Let us know which calculator it was on and what you saw, and we'll take a look.