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

Frame outer width (mm)

Outer width of the window frame in millimetres.

Frame outer height (mm)

Outer height of the window frame in millimetres.

Sash count

Number of opening sashes per frame; two is typical for a casement pair.

Compute the frame piece count, sash count, and glazing bead length for a window frame from its outer size. 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 per window frame.

Sashes per frame

Number of sashes built into the frame.

Glazing bead length (mm)

Perimeter of the frame outer rectangle: two times the sum of outer width and outer height.

• 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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