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

Clear Opening Millimeters (mm)

Required number input.

Leaf Width Millimeters (mm)

Required number input.

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

Gap Each Side Millimeters (mm)

The resulting gap 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 Blatt Ueberfaltung

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

• Door Floor Clearance Calculator

  Compute the finished door leaf height from the opening height minus the floor clearance below the leaf.

• Drawer Front Overlay

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