Calculating Broad Butt Hinge sizes required on Rebated or Single Doors
(Where the door needs to swing back 180 degrees)
To calculate width of hinge required you will need to:
Measure the Door Jamb Setback (distance from the door jamb to the corner of the wall you are trying to clear). See image above.
The formula you will need is:
Door Jamb Setback + 30mm (hinge cutout in jamb) + 10mm (General Clearance) + 30mm (hinge cutout in door) = open width of hinge required.
For example, if the Door jamb Setback = 50mm, the calculation would look like this: 50mm + 30mm + 10mm + 30mm = 120mm.
This means you would require a hinge 120mm in width or larger.
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