Door size measurement conversion table
A simple guide (in pdf format) relating to common door size measurements.
This item is to try and make it easier for our customers to see at first hand the different door sizes that are available, not all doors are available in all sizes, our PDF at the foot of this item is in an easy to print format.
Image from ToolStation.com
Imperial sizes are the traditional sizes measured in "inches" or "feet and inches"
Metric sizes have been used by builders of new homes for about 30 years, they are a different height and have different widths/thickness from the imperial sizes.
Imperial sizes are normally 1.3/8th inches thick (35mm) for older doors, the two larger sizes may be 40mm or 45mm.
Metric doors are normally 40mm thick (1.5/8th) for more modern doors.
All FD30 (1/2 Hour fire doors) are 1.3/4” inches - 45mm thick.
Please feel free to print the following pdf for reference, conversions are as accurate as possible.