Dowel Joint Calculator

Calculate optimal dowel size, depth, and spacing for strong edge and face joints.

Recommended Dowel Count
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Dowel Diameter
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Dowel Length
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Hole Depth (each side)
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Spacing (center-to-center)
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Drill Bit Size
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Edge Distance (min)
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Dowel Joint Design Rules

Dowel diameter = 1/3 to 1/2 of board thickness

Dowel length = 5x diameter (2.5x each side)

Spacing = 6" to 8" apart along the joint

Tips

  • Use fluted or spiral-grooved dowels for better glue distribution
  • Drill holes 1/16" deeper than needed for glue reservoir
  • Use a doweling jig for precise alignment
  • Chamfer dowel ends for easier insertion

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