Contact

Found a bug? Want a calculator we haven't built? Business enquiry? We read everything.

What to include for bug reports

The calculator's name, the exact inputs you used, the result you got, and the result you expected. With those four things we can usually reproduce and fix an issue the same week — confirmed fixes are noted on our methodology page.

Prefer email?

Write to hello@listcalc.com. Either route reaches the same inbox. We aim to reply within a few days; your details are used only to answer you (see the privacy policy).