Dovetail Angle Calculator
Calculate the correct dovetail angle for your wood species.
Get the ideal slope ratio for hand-cut dovetail joints in hardwood and softwood.
The dovetail angle (slope ratio) determines how much the tails flare out. The correct angle balances mechanical strength (more flare = harder to pull apart) against structural integrity (too much flare = short grain that can split).
Traditional dovetail angles:
- Hardwood (oak, maple, cherry, walnut): 1:8 (7.1°): less flare, strong grain
- Softwood (pine, cedar, spruce): 1:6 (9.5°): more flare, weaker grain needs more mechanical lock
- Variation: Anywhere from 1:5 (11.3°) to 1:10 (5.7°) will work
Slope formula: Slope angle = arctan(1 / ratio) Example: 1:8 ratio → arctan(0.125) = 7.125°
How to set a sliding bevel: The ratio notation (1:6, 1:8) tells you how to set the bevel physically:
- Mark 1 unit across the baseline
- Mark the ratio number (6 or 8) along the direction of cut
- Set your bevel to connect these two marks
Proportions of pins to tails: There is no single correct proportion, but common ratios are:
- Fine furniture: thin pins (1/3 of tail width), many tails
- Utility boxes: equal pins and tails
- Rustic / structural: thick pins, fewer tails
Half-blind dovetails (used for drawer fronts) are typically set to 1:6–1:7 to give more mechanical resistance since only the tails are hidden.
How we build and check this calculator
This calculator runs entirely in your browser, so the numbers you enter stay on your device. The math behind it is written by hand and tested against worked examples and standard references before the page goes live.
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