Clear Opening Widths

Our interactive Clear Opening Widths Calculator below allows you to work out the Clear Opening Width, Leaf Width, Frame Width or Structural Opening Width for a number of varied door constructions.

To use the Calculator, click on Filter 1 for the Leaf Configuration, Filter 2 for the Leaf Action, and Filter 3 for the Known Dimensions for the required construction. The resulting dimensions are then shown highlighted in green in the Output Form below. Default dimensions are provided in the orange boxes and can be amended by typing in the required data. Fixed dimensions are shown in the white boxes. Results will be calculated automatically by default.

Please note, the actual door leaf width required to ensure the correct 'Effective Clear Width' as identified in Approved Document M and BS8300-2: 2018, will depend on the combination of several variables for reference:

- Leaf thickness
- Rebate/stop depth
- Hinge knuckle diameter
- Ironmongery projection (e.g. lever handle, pull handle etc)

Clear Opening Widths Calculator

Leaf Configuration



Leaf Action





Known Dimensions





 
Clear opening width
ironmongery projection
Leaf Thickness
hinge knuckle diameter
rebate/stop depth
rebate to rebate
Leaf To Frame Gaps
Leaf Width
frame thickness
Frame width
Frame to wall gap
Structural Opening Width
 
Calculate automatically
 
Clear opening width
ironmongery projection
Leaf Thickness
pivot point from inside frame
rebate to rebate
Leaf To Frame Gaps
Leaf Width
frame thickness
Frame width
Frame to wall gap
Structural Opening Width
 
Calculate automatically
 
Clear opening width
ironmongery projection
fire rating
Leaf Thickness
pivot point from inside scallop
Rebate/Stop Depth
rebate to rebate
Leaf To Frame Gaps
Leaf Width
frame thickness
Frame width
Frame to wall gap
Structural Opening Width
 
Calculate automatically
 
Clear opening width
ironmongery projection
fire rating
Leaf Thickness
pivot point from inside frame
Rebate/Stop Depth
rebate to rebate
Leaf To Frame Gaps
Leaf Width
frame thickness
Frame width
Frame to wall gap
Structural Opening Width
 
Calculate automatically
 
Clear opening width
ironmongery projection
Leaf Thickness
pivot point from inside frame
Rebate/Stop Depth
hinge knuckle diameter
Leaf To Leaf Gap
rebate to rebate
Leaf To Frame Gaps
primary Leaf Width
secondary Leaf Width
frame thickness
Frame width
Frame to wall gap
Structural Opening Width
 
Calculate automatically
 
Clear opening width
Primary Leaf Ironmongery Projection
Secondary Leaf Ironmongery Projection
Leaf Thickness
hinge knuckle diameter
meeting stile gap
rebate to rebate
Leaf To Frame Gaps
Leaf Width
frame thickness
Frame width
Frame to wall gap
Structural Opening Width
 
Calculate automatically
 
Clear opening width
Primary Leaf Ironmongery Projection
Secondary Leaf Ironmongery Projection
Leaf Thickness
pivot point from inside frame
meeting stile gap
rebate to rebate
Leaf To Frame Gaps
Leaf Width
frame thickness
Frame width
Frame to wall gap
Structural Opening Width
 
Calculate automatically
 
Clear opening width
Primary Leaf Ironmongery Projection
Secondary Leaf Ironmongery Projection
fire rating
Leaf Thickness
pivot point from inside frame
meeting stile gap
rebate to rebate
Leaf To Frame Gaps
Leaf Width
frame thickness
Frame width
Frame to wall gap
Structural Opening Width
 
Calculate automatically
 
Clear opening width
Primary Leaf Ironmongery Projection
Secondary Leaf Ironmongery Projection
fire rating
Leaf Thickness
pivot point from inside frame
meeting stile gap
rebate to rebate
Leaf To Frame Gaps
Leaf Width
frame thickness
Frame width
Frame to wall gap
Structural Opening Width
 
Calculate automatically
 
Clear opening width
primary leaf width
Primary Leaf Ironmongery Projection
Secondary Leaf Ironmongery Projection
Leaf Thickness
hinge knuckle diameter
meeting stile gap
rebate to rebate
Leaf To Frame Gaps
secondary leaf width
frame thickness
Frame width
Frame to wall gap
Structural Opening Width
 
Calculate automatically
 
Clear opening width
primary leaf width
Primary Leaf Ironmongery Projection
Secondary Leaf Ironmongery Projection
Leaf Thickness
pivot point from inside frame
meeting stile gap
rebate to rebate
Leaf To Frame Gaps
secondary leaf width
frame thickness
Frame width
Frame to wall gap
Structural Opening Width
 
Calculate automatically
 
Clear opening width
primary leaf width
Primary Leaf Ironmongery Projection
Secondary Leaf Ironmongery Projection
fire rating
Leaf Thickness
pivot point from inside frame
meeting stile gap
rebate to rebate
Leaf To Frame Gaps
secondary leaf width
frame thickness
Frame width
Frame to wall gap
Structural Opening Width
 
Calculate automatically
 
Clear opening width
primary leaf width
Primary Leaf Ironmongery Projection
Secondary Leaf Ironmongery Projection
fire rating
Leaf Thickness
pivot point from inside frame
meeting stile gap
rebate to rebate
Leaf To Frame Gaps
secondary leaf width
frame thickness
Frame width
Frame to wall gap
Structural Opening Width
 
Calculate automatically