Use this workshop calculation to turn measured dimensions and the selected construction convention into a cut, spacing, fit, or material-planning value.

Door width (mm)

Width of the finished door in millimetres.

Door height (mm)

Height of the finished door in millimetres.

Bead allowance (mm)

Extra length per mitred corner for fitting the bead; ten millimetres is typical.

Compute the mitered frame piece count and decorative bead length for a framed door from door size and bead allowance. The tool evaluates the supplied inputs together and returns the named outputs below; it does not infer omitted operating conditions or change the units shown.^[1]

Frame piece count

Four frame pieces: two stiles and two rails.

Bead length (mm)

Mitred perimeter with allowance: two times the sum of door width and height plus four times the bead allowance.

• Nominal dimensions, kerf, moisture movement, hardware clearances, wall squareness, and manufacturer instructions can change the required shop dimension. Measure the actual assembly and test critical joints on scrap before cutting finished material.
• Use finite inputs in the displayed units and preserve more precision than the final presentation requires. Independently verify safety-critical, financial, compliance, or production decisions.

Complement the calculated dimension with a physical story stick, dry fit, or full-size layout. Follow the hardware, coating, adhesive, or machine manufacturer's limits where they differ from a rule of thumb.

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