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

Diameter Millimeters (mm)

Required number input.

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

Suggested Length Millimeters (mm)

The resulting suggested length 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.

• Holzschraube Vorbohrung 07d

  Rule-of-thumb pilot diameter equal to 70% of a wood screw's outside diameter; adjust for screw and timber manufacturer guidance.

• Domino Routing Depth Calculator

  Compute the mortise depth for a centered Domino loose-tenon joint. Each workpiece normally receives half the nominal tenon length; verify the joiner's available depth-stop setting, especially for the 4 x 20 mm Domino.

• Dowel Spacing

  Calculate equal center-to-center spacing for dowels whose outermost center positions span a measured length.