What to write about
A wrong conversion factor
This is the one we most want to hear about. If a number here disagrees with the governing standard, tell us which page and which unit, and cite the source if you have it. Corrections are made on the page itself.
A converter you want added
If there is a conversion you keep looking up, say so. Requests shape what gets built next — area, pressure, energy, data storage and fuel economy are all on the list.
Accessibility problems
If a converter does not work with your screen reader, keyboard or browser, that is a bug and we would like to fix it. Please mention the page and the assistive technology you use.
Advertising
Advertising enquiries are welcome. Advertisers have no say in what these pages say, and we do not publish sponsored content dressed up as editorial.
What we cannot help with
We cannot verify figures for legal, medical or trade use. If a conversion has to be right for a contract, a prescription, a structural calculation or a trade-measurement obligation, check it against the governing standard for your jurisdiction, or against a certified instrument. A free web tool is a convenience and should never be the last word on something that matters.
Privacy
Emails you send are stored in our mailbox and used only to reply to you. They are not added to any list and not shared. See the privacy policy for how the rest of the site handles data.