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

Rectangular blank width (mm)

Required number input.

Rectangular blank thickness (mm)

Required number input.

Find the largest full-length round diameter that can be turned from rectangular stock without adding material. 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]

Maximum full-length round diameter (mm)

The resulting maximum full-length round diameter 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.

• Gate Diagonal Brace Length

  Find the straight corner-to-corner brace length of a rectangular gate frame; excludes joinery and end cuts.

• Rabbet Depth

  Find rabbet cut depth from stock thickness and the remaining material web specified by the maker.

• Saw Kerf Loss

  Calculate total stock length removed by a known number of full-width saw cuts and blade kerf width.