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

Leaf Width Millimeters (mm)

Required number input.

Clear Opening Millimeters (mm)

Required number input.

Equal side overlay of a centered door leaf over a narrower clear opening, based on measured leaf and opening widths. 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]

Overlay Each Side Millimeters (mm)

The resulting overlay each side millimeters 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.

• Tuer Luft Spalt

  Equal left and right side clearance of a centered door leaf inside a wider clear opening.

• Drawer Front Overlay

  Find equal side overlay of a centered drawer front from front width and clear opening width.

• Lichtausschnitt Tuer Glas Groesse

  Calculate rectangular glass cut size from a measured door opening and equal edge clearance on all sides; glazing bite is not included.