National Physical Laboratory

What is the conversion between inches and metres? (FAQ - Length)

1 inch = 25.4 mm exactly.

Multiples of the inch, e.g. foot, yard etc., are multiples of 25.4 mm in length.

Last Updated: 25 Mar 2010
Created: 17 Jul 2007


Please note that the information will not be divulged to third parties, or used without your permission