Calculator · Joinery & fasteners
Box Joint (Finger Joint) Calculator
The free Box Joint (Finger Joint) Calculator answers one question: Finger count and exact width for full fingers at both edges. Enter your numbers in inches or millimeters and the result updates instantly in your browser, with no sign-up and no app to install. Use it on your phone at the bench, then copy or print the result for your cut list.
Box Joint (Finger Joint)
- Fingers + slots
- 15
- Adjusted finger width
- 3/8″
- Fingers on board A
- 8
- Fingers on board B
- 7
Pro tools · unlock
Which other joinery & fasteners calculators help with this project?
- Dado & Rabbet Depth Calculator — Safe dado and rabbet depths for your stock.
- Biscuit Size Calculator — Which biscuit (#0, #10, #20) for your stock.
- Mortise & Tenon Size Calculator — Tenon thickness, shoulders and length.
- Wood Screw Length Calculator — Right screw length for joining two boards.
- Pocket holes vs. dowels vs. biscuits — Related guide
What you'll need for this project
Tools
Screws & hardware
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Build it · Intermediate · Half a day
Download the complete plan with cut list and materials list (PDF)
Table Saw Box Joint Jig — Adjustable miter-gauge jig for perfect 1/4″, 3/8″ and 1/2″ finger joints. Drawings, cut list with board-foot totals, hardware list and step-by-step instructions.