How does the timber moisture shrinkage calculator work?
Approximate directional moisture movement, not a species lookup, structural tolerance or prediction of warping. Use tangential or radial shrinkage for the measured direction. Moisture above fiber saturation does not add further shrinkage in this model.
Which measurements do you need for timber moisture shrinkage?
Use tangential or radial shrinkage for the measured direction. Moisture above fiber saturation does not add further shrinkage in this model. Measure the actual installed geometry or quoted quantity rather than substituting a nominal product size.
Which formula calculates timber moisture shrinkage?
Dimension factor at moisture M = 1 − S × (1 − min(M, fiber saturation) / fiber saturation); final dimension = initial × final factor / initial factor.
What does a timber moisture shrinkage worked example show?
With 100 mm at fiber saturation 30%, 6% green-to-ovendry shrinkage and a 15% final moisture content, the estimated final dimension is 97 mm.
Which units apply to timber moisture shrinkage?
Use the labeled units in the input reference below. The Imperial / Metric selection converts fields with dynamic unit labels. Fixed-unit fields retain the units printed in their labels.
Leave optional inputs blank when unavailable. Required fields and paired data are checked before a result is displayed.
| Input | Units | When used |
|---|---|---|
| Initial cross-grain dimension (mm) | as labeled | all modes |
| Initial moisture content (%) | as labeled | all modes |
| Final moisture content (%) | as labeled | all modes |
| Verified fiber saturation moisture (%) | as labeled | all modes |
| Verified green-to-ovendry shrinkage (%) | as labeled | all modes |
Which assumptions change the timber moisture shrinkage result?
Approximate directional moisture movement, not a species lookup, structural tolerance or prediction of warping. Use tangential or radial shrinkage for the measured direction. Moisture above fiber saturation does not add further shrinkage in this model.
How should you check the timber moisture shrinkage estimate?
Use tangential or radial shrinkage for the measured direction. Moisture above fiber saturation does not add further shrinkage in this model. Keep measured values separate from any extra allowance or quoted price. Check the resulting unit and rounding before ordering or using the result.
How can you compare timber moisture shrinkage scenarios?
Calculate one baseline and add it to comparison. Change one measured input or verified product value and calculate again. Comparison keeps the itemized inputs and results so the changed assumption remains visible.
How can you save or share the timber moisture shrinkage result?
After calculation, copy or share the result, download the worksheet or print the inputs and result. Embed and citation controls are in the header. Clear changes removes the current worksheet, and a browser refresh opens blank numeric inputs.
Which related tools help with timber moisture shrinkage?
Use Stair Calculator, Board Foot Calculator, Framing Calculator for related project quantities. Each tool has its own scope; avoid transferring a result without checking its unit and assumptions.
