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.