Wood Moisture Calculator

The Wood Moisture Calculator determines moisture content in lumber, timber, and wood products. This specialized calculator includes species-specific data, fiber saturation points, and kiln drying recommendations essential for woodworking, construction, and lumber processing.

Modify the values and click the calculate button to use
Wood Species
Measurement Method  
Green Weight grams
Oven Dry Weight grams
Wood Thickness mm
Intended Use

Related Moisture Content Calculator | Kiln Drying Calculator | Equilibrium Moisture Calculator

Understanding Wood Moisture Content

Wood moisture content is critical for quality, stability, and performance. It affects shrinkage, warping, checking, and the wood's ability to accept finishes and adhesives.

Key Concepts

Fiber Saturation Point (FSP)

The moisture content at which the cell walls are saturated but no free water exists in the cell cavities. Typically around 28-30% for most species.

Equilibrium Moisture Content (EMC)

The moisture content at which wood neither gains nor loses moisture when exposed to specific temperature and humidity conditions.

Measurement Methods

Oven Dry Method (ASTM D4442)

Moisture Meter Method

Species-Specific Information

Hardwoods

  • Oak: FSP ~28%, High shrinkage, Excellent for furniture
  • Maple: FSP ~29%, Moderate shrinkage, Good for flooring
  • Walnut: FSP ~27%, Low shrinkage, Premium furniture wood
  • Cherry: FSP ~28%, Moderate shrinkage, Fine furniture

Softwoods

  • Pine: FSP ~30%, Moderate shrinkage, Construction lumber
  • Douglas Fir: FSP ~28%, Low shrinkage, Structural applications
  • Cedar: FSP ~26%, Very low shrinkage, Outdoor use

Recommended Moisture Content by Use

Application Moisture Content
Construction Lumber 19% maximum (S-DRY), 15% maximum (KD-15)
Interior Furniture 6-8%
Hardwood Flooring 6-9%
Millwork/Trim 8-12%
Outdoor Decking 12-15%

Drying Considerations

Common Drying Defects