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

Flat jamb face width (mm)

Required number input.

Casing overlap on jamb (mm)

Required number input.

Find exposed jamb-face reveal when a casing overlaps part of the available flat jamb face. 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]

Exposed jamb reveal (mm)

The resulting exposed jamb reveal returned as a number.

• 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.

• Edge Banding Trim Allowance

  Calculate total edge-banding width to trim and the equal amount per face when strip is centered on a panel.

• Face Frame Rail Length

  Find butt-jointed face-frame rail length between left and right stiles from overall face-frame width.

• Wainscoting Panel Height

  Find exposed wainscoting panel height below a finished top elevation after baseboard and top-cap allowances.