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

Wet Mass Grams (g)

Required number input.

Oven Dry Mass Grams (g)

Required number input.

Holzfeuchte (dry-basis moisture content) from current and oven-dry wood masses; not a wet-basis percentage. 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]

Moisture Percent (%)

The resulting moisture percent 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.

• Oven Dry Moisture Content

  Compute wood moisture content in percent from wet and oven-dry masses.

• Holz Gewicht Bei Feuchte

  Wood mass at a target dry-basis moisture content from its oven-dry mass.

• Holz Quellung

  Expected across-grain wood swelling over a rising dry-basis moisture content, using a species- and direction-specific measured movement coefficient.