Contact

Use this page to report a calculator error, suggest a calculator or ask a question about how a result is worked out.

How to reach us

Send an email to an email address for reports, which will be published here once it is set up. There is no contact form on this site.

What to include in an error report

• The page. The address or the name of the calculator.
• The inputs you used. Every field, including options such as round trip.
• The result you saw. And, if you know it, the result you expected and how you worked it out.
• Your device and browser, if the page looked or behaved oddly.

With those four things a mistake can usually be reproduced straight away.

Before you write

Read the “how this is calculated” section on the calculator page. Many differences come from a rounding step, a unit, or an assumption, such as whether round trip is ticked. The about page explains what the calculators do and do not include, and the privacy policy explains what happens to anything you send.