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

First Member Millimeters (mm)

Required number input.

Embedment Millimeters (mm)

Required number input.

Minimum screw length to pass through the first member and reach a specified embedment in the receiving member; excludes countersinking. 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]

Minimum Screw Millimeters (mm)

The resulting minimum screw 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.

• Nail Length Rule

  Minimum nail length from the thickness of the attached board and a separately chosen penetration depth into the receiving member; not a withdrawal-capacity check.

• Duebellaenge 5x Durchmesser

  Rule-of-thumb wooden dowel length equal to five times dowel diameter; verify actual embedment and joint design.

• 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.