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Dowel Joint Calculator
Dowel size, spacing and count for a butt joint.
ruler Free Online Tool
⚡ Instant Results
📊 Clear Comparison
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Dowel diameter (about one third of thickness)
Compare Your Options And Get Clear Answers
Dowel size, spacing and count for a butt joint.
Dowel Joint Estimator
Enter your numbers below for an instant estimate.
0
💡 Tip: Dowel diameter = thickness / 3.
How It Works
Key concepts behind this calculator
1
Enter Values
Fill in each field with your own numbers.
2
Calculate
Results update as you change the inputs.
3
Review
Read the breakdown and the explanation.
4
Adjust
Change values to compare scenarios.
Quick Reference Guide
Dowel Quick Guide
Typical values for reference.
| Thickness | Length | Spacing | Dowel |
|---|---|---|---|
| 18 | 600 | 120 | 6 mm dowels |
| 15 | 400 | 100 | 5 mm dowels |
| 25 | 1000 | 150 | 8 mm dowels |
| 19 | 300 | 100 | 6 mm dowels |
| Rule of Thumb | Check inputs | Use as a guide | Round sensibly |
Common Questions
Dowel Joint Calculator FAQ
Answers to common questions about this calculator.
About one third of the board thickness.
Around five times its diameter.
100 to 150 mm.
General guidance only.