Mortise & Tenon Calculator
Calculate centered tenon and mortise dimensions from stock thickness, stock width and chosen tenon proportion.
Results
Tenon / mortise thickness
—
Cheek removal each face
—
Tenon width
—
Shoulder each side
—
Use the result as a planning estimate and verify project-specific measurements, manufacturer information and local requirements where relevant.
How it works
The tenon is centered through the stock thickness; the remaining material is split equally between the two cheeks. Side shoulders are subtracted from the stock width.
tenon thickness = stock thickness × selected percentageLimitations
- Joint proportions depend on material, grain, tooling and load. The calculator provides geometry, not a strength rating.