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

Radius (mm)

Rounding radius applied to the edge.

Calculate the cross-sectional area removed when a square corner is rounded to a quarter-circle of the specified radius. 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]

Removed cross-sectional area (mm²)

Removed corner area per unit length of the edge.

• 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.

• Tenon Shoulder

  Calculate equal tenon shoulder widths when a centered tenon is cut from a wider stock edge.

• 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.