We get a lot of questions about door sizes and how to measure doors so here’s an explanation that should hopefully help if you need to measure your door frames prior to buying the doors.
Standard Door Sizes
Internal doors are typically available in a number of standard interior door sizes. Internal door widths may be given in metric or imperial measurements such as 2’ 6” or 30 inches or 726mm (all the same, if you’re wondering!). Similarly height may be referred to as 6’ 6” or 78 inches or 1981mm. A joiner may refer to “two, six by six, six”. These are examples of standard measurements. Interior door thickness can also vary although typically standard internal doors are 35mm or 40mm. Fire doors are usually supplied 44mm or 54mm thick. See our door size converter for full details of imperial and metric conversions.
Some styles are available in custom sizes if you have an unusual sized doorframe. Older properties may require a made to measure door while more modern properties usually feature standard sized doors.
How to Measure an Internal Door
Measuring for an internal door is fairly straightforward but it is important to get it right so here’s some tips: -
Step 1 Measuring the internal dimensions of the door frame
Starting with the width, measure the top section of the frame (F1) and the bottom section of the frame (F2), hopefully the measurements will be same at the top and bottom.
Note: Do not measure between the door stops (the timber that the door rests upon when closed), see F3 for illustration.
If still in doubt call our sales team for advice. Measure again two, three or more times until you feel you have got the precise measurement. Once you feel confident you have the width measurements correct, you then need to measure the height.