1Edge Joint (3/4" Stock)
Inputs
Thickness0.75"
Joint Length12"
Dowel3/8"
Result
Dowels Needed5
Dowel Joint Calculator
Dowels Needed
4
Length Each
0.962"
Drill Bit
0.375"
Dowels Needed
4
Dowel Length
0.962"
Depth Per Side
0.45"
Drill Bit
0.375"
What You'll Need
IRWIN Marples Chisel Set 6-Piece Woodworking
$30-$454.6
View on AmazonRockler Doweling Jig Kit with 3 Drill Guides
$20-$304.5
View on Amazon
General Tools 840 Dovetail Jig Template
$20-$304.3
View on AmazonAs an Amazon Associate, we earn from qualifying purchases.
Example Calculations
2Face Frame (1/2" Stock)
Inputs
Thickness0.5"
Joint Length3"
Dowel1/4"
Result
Dowels Needed2
Frequently Asked Questions
QWhat size dowel should I use?
The dowel diameter should be no more than half the board thickness. For 3/4" stock, use 3/8" dowels. For 1/2" stock, use 1/4" dowels. This prevents splitting while maximizing joint strength.
- Rule: dowel diameter ≤ 1/2 board thickness
- 3/4" stock: use 3/8" dowels
- 1/2" stock: use 1/4" dowels
- 1" stock: use 1/2" dowels
- Too large risks splitting the wood
QHow deep should dowel holes be?
Drill each side to 1.5x the dowel diameter depth, with a small gap (1/16") for glue squeeze-out. For 3/8" dowels, drill about 9/16" deep into each board, making the total dowel length about 1-3/16".
- Depth per side: 1.5× dowel diameter
- Leave 1/16" gap for excess glue
- Total dowel length = 2× depth + gap
- Never exceed 60% of board thickness per side
QHow far apart should dowels be spaced?
Space dowels 2-4 inches apart for edge joints, with 1-2 inches from each end. For most 3/4" stock applications, 3" spacing provides good strength without weakening the wood.
- Edge joints: 2–4" spacing
- Face frames: 2–3" spacing
- Keep 1–2" from board ends
- 3" is a good default for 3/4" stock
QDo I need a doweling jig?
A doweling jig is highly recommended for accurate hole alignment. Even 1/32" misalignment can prevent the joint from closing. Self-centering dowel jigs cost $20-50 and dramatically improve accuracy.
- Misalignment of 1/32" causes gaps
- Self-centering jigs start around $20
- Mark boards together before drilling
- Use dowel centers for transfer marking
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Last Updated: Mar 26, 2026
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