Wood Movement & Equilibrium Moisture Content (EMC) Calculator
Calculate Equilibrium Moisture Content (EMC) from ambient temperature and relative humidity, and determine exact tangential and radial dimensional expansion and shrinkage for hardwoods and softwoods per the USDA Wood Handbook.
Wood Species & Board Dimensions
Inches
Moisture & Climate Range
%
Winter / Kiln Dried benchmark.
%
Humid summer peak benchmark.
Total Dimensional Movement
+0.788 IN EXPANSION
+0.788 in
Approximately +25/32" (+20.0 mm) movement across width
Final Expanded Width
36.788 in
934.4 mm expanded dimension
Change in Moisture (ΔMC)
+6.0 %
From 8.0% to 14.0% MC
Joinery & Fastening Recommendations
Provide slotted figure-eight fasteners, Z-clips, or oversized oblong screw slots allowing at least 0.8" of free cross-grain expansion to prevent panel splitting.