Effective clear widths calculator

The actual door leaf width required to ensure the correct 'Effective Clear Width' as identified in Table 2 and Diagram 9 of Approved Document M 2004 and Figure 14 and table 2 of BS8300 will depend on the combination of several variables for reference:
- Door thickness
- Frame stop size
- Hinge throw (based on the pivot point of the door)
- Face fixed items on the closing face (E.g. Lever handle, pull handle, weatherboard, etc)

Single Leaf Situations
Leaf to Effective Clear Width
Door width
Door thickness
Frame rebate
Hinge knuckle
Handle projection (where relevant)
Effective clear width


Effective Clear Width to Leaf
Effective clear width
Frame thickness
Door thickness
Frame rebate
Hinge knuckle
Handle projection (where relevant)
Minimum door width
Structural opening

Paired Leaf Situation - One Leaf Open
Leaf to Effective Clear Width
Primary leaf width
Door thickness
Hinge knuckle
Handle projection (where relevant)
Effective clear width


Effective Clear Width to Leaf
Effective clear width
Door thickness
Hinge knuckle
Handle projection (where relevant)
Minimum primary door width