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

Board Length Mm (mm)

Required number input.

Defect Length Mm (mm)

Required number input.

Kerf Allowance Mm (mm)

Required number input.

Remaining usable board length after cutting away a measured defect segment and a specified saw-kerf allowance. 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]

Usable Length Mm (mm)

The resulting usable length mm 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.

• Auszugsschienen Laenge

  Longest drawer-slide length that fits a measured cabinet interior depth after reserving a specified rear clearance; choose an available product size no longer than this result.

• Crown Molding Length

  Total measured crown-molding runs and add a project-specific cut-and-waste allowance.

• Decking Gap Spacing

  Predict clear decking gap after a specified signed change in board width; positive board expansion reduces the gap.