Estimate how much a board changes across the grain when moisture content moves. Coefficients are green-to-oven-dry radial and tangential shrink % from The Wood Database, scaled by your moisture swing over a 28% fiber-saturation approximation.
Shrinkage figures checked 2026-09-13. Results are approximate — not a shop warranty.
Grain orientation
Growth rings mostly parallel to the face — usually moves more.
Across the face — not length.
Shrinks about 0.057 in
Secondary verifiedWestern red cedar, flat-sawn (tangential), 8 in wide, MC 12% → 8%. Using 5% tangential shrink and FSP 28%.
Formula: width × shrink% × (MCstart − MCend) / FSP. Length change along the grain is tiny by comparison and is not estimated here.
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