Finger Joint Ref
About Finger Joint
What this tool does
Woodworking tools calculate board feet, estimate wood shrinkage as moisture changes, compute miter angles for polygon frames, predict shelf sag under load, determine dovetail spacing, and size pilot holes for screws.
Why use this tool
Woodworking is a craft where small measurement errors compound. A miter joint that is off by half a degree shows a visible gap. These calculators help you plan cuts and joinery with the precision the material demands.
How it works
Board-foot calculations multiply thickness (in.) x width (in.) x length (ft.) and divide by 12. Shrinkage applies species-specific coefficients to the moisture-content change. Miter angles divide 360 degrees by the number of sides.
Pro tip
Always measure moisture content before cutting expensive hardwood. Wood at 12% moisture will shrink noticeably as it acclimates to an interior environment at 6-8%, causing joints to open.
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