Contact

Write to us to report a mistake, suggest a new calculator or ask a question about the site. If your message is about a calculation, paste the link you get with the "Copy link" button: it contains all the measurements you entered and lets us redo the calculation exactly as you saw it.

We usually reply within a few days, at the email address you give. You will get a confirmation email right away: if it does not arrive, check your spam folder.

We do not ask for any details beyond those in the form.