Dovetail Joint Spacing Calculator
Enter your board width, tail count, and wood type to get tail width, pin width, angle, and a live layout diagram. Evenly spaced across the full board width. Nothing uploaded.
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Learn more: Dovetail joint geometry and layout
What is a dovetail joint and why are they strong
A dovetail joint interlocks two pieces of wood using alternating "tails" and "pins" shaped like a dove's tail. The interlocking angles prevent the joint from separating under pulling force. Dovetails are among the strongest wood joints and have been used in fine furniture for centuries.
Tail angle and wood grain orientation
The angle of the tails determines joint strength and grain visibility. Traditional angles are 8-9 degrees for hardwoods and 10-12 degrees for softwoods, based on wood grain strength. Shallower angles (closer to vertical) are stronger; steeper angles look more dramatic. The calculator accounts for your wood species.
Spacing and layout guidelines
Evenly spaced tails and pins look clean and balanced. Most layouts use the "half-tail" approach where tails at the edges are narrower than interior tails, creating symmetry and strength. The calculator generates your exact spacing so you can mark it directly onto your wood.
Hand and power tool considerations
Hand-cut dovetails benefit from wider pins and tails (easier to saw accurately). Machine-cut (router jigs) can handle narrower spacing. The calculator lets you adjust spacing to match your tool capability.
Frequently asked questions
8-9 degrees for hardwoods, 10-12 degrees for softwoods, based on grain strength. The calculator selects the right angle for your wood type.
Hand-cut joints typically use wider spacing (easier to saw). Machine-cut can be narrower. Start with 3/4" to 1" for hand work, 3/8" to 1/2" for routers.
Narrower tails at the edges with full-width tails in the middle, creating visual balance and matching grain patterns symmetrically on both sides.