Biscuit Joint Calculator — Biscuit Size and Spacing
Calculate biscuit size, quantity, and spacing for panel and edge joints.
How We Calculate This
This calculator determines biscuit quantity and spacing for your joint.
Spacing rules
- Edge distance: minimum 75mm from each end
- Target spacing: ~150mm between biscuits
- Minimum 2 biscuits per joint
Slot depth
Slot depth = half the biscuit width + ~1mm clearance for glue expansion (e.g. #20 = 23/2 + ~1 ≈ 12.5mm, matching Lamello’s 12.3mm). The biscuit’s length runs along the joint line; only its width penetrates the board edge.
Frequently Asked Questions
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Last updated: February 2026
All calculations are estimates. Always verify measurements and material quantities before cutting or purchasing.