Calculate dovetail pin and tail spacing for a hand-cut dovetail joint.
Printable cut layout
Usage Tip
Lay out from the center outward so any half-pin at the edges comes out symmetric; mark the waste side clearly before sawing.
tail width = spacing − pin width (1/4 in typical)
Spacing is center to center, and tail width assumes a 1/4 inch pin at the narrow end.
The real question: will this layout look good?
Most dovetail calculators hand you a spacing number and leave. But almost no woodworker is actually asking what the spacing is — they are asking whether the layout will look right across this particular drawer side before they commit a saw to expensive hardwood. This tool answers that by drawing the joint to scale: pick a width and a tail count and see the pins, tails, and half-pins exactly as they will sit, with the marking dimensions underneath.
Pins and tails: the anatomy
A dovetail joint alternates wide flaring tails with narrow pins. The classic, strong, good-looking layout always begins and ends with a half-pin at the board edge, so a joint with N tails has N+1 pins. Three tails means four pins (two of them half-pins). The half-pins protect the corners and give the joint its balanced look.
Spacing is marked at the baseline. The tails then flare outward toward the end of the board at the dovetail angle, and the pins taper to match.
How many tails for my board?
There is no single rule, but a tail roughly every 1-1/2 to 2 inches looks balanced on most drawer and box sides. Fewer, larger tails read as rustic and hand-made; more, finer tails read as refined.
| Board width | Typical tails |
|---|---|
| 4 in | 2 to 3 |
| 6 in | 3 to 4 |
| 8 in | 4 to 5 |
| 10 in | 5 to 6 |
| 12 in | 6 to 7 |
Traditional dovetail angles
The dovetail slope is given as a ratio: 1 unit of horizontal flare for so many units of depth. Too steep and the short grain at the tail tips breaks; too shallow and the joint can pull apart.
| Material | Ratio | Approx angle |
|---|---|---|
| Softwood | 1:6 | about 9.5 degrees |
| General purpose | 1:7 | about 8.1 degrees |
| Hardwood | 1:8 | about 7.1 degrees |
The softer the wood, the steeper the angle it can hold; hardwoods use a shallower 1:8.
Dovetail styles
Through dovetail
Pins and tails pass fully through and show on both faces. The strongest and most common, used for boxes and the backs of drawers.
Half-blind dovetail
The pins stop short so the joint is hidden on one face. Standard for the fronts of quality drawers. The socket depth is usually about two-thirds of the board thickness; the spacing layout is the same as a through joint.
Secret mitered dovetail
A dovetail hidden inside a mitered corner, invisible from outside. A showpiece joint for fine casework.
Sliding dovetail
A single long tail that slides into a matching socket, used for shelves and partitions. This is one dovetail in a groove rather than a row of pins and tails.
Layout methods
Equal tails and equal pins both produce an evenly spaced, symmetrical joint and are what most people mean by a traditional layout. A decorative layout deliberately varies the tail sizes — often larger in the center — for a custom look. Variable layout lets you set the tail count and pin width yourself.
Hand-cut vs router
Hand-cut dovetails can use very narrow pins, which is the hallmark of fine craftsmanship; the spacing is entirely your choice. A router and dovetail jig is faster but the bit sets a minimum pin width, and many fixed jigs produce equally spaced pins and tails at a set interval such as 7/8 in. If you are using a jig, match your layout to the jig template.
Drawer box examples
| Drawer side | Suggested layout |
|---|---|
| 4 in jewelry drawer | 2 to 3 fine tails |
| 6 in utensil drawer | 3 to 4 tails |
| 8 in standard drawer | 4 to 5 tails |
| 10 to 12 in deep drawer | 5 to 7 tails |
Marking the joint
Set a marking gauge to your board thickness and scribe the baseline on both faces. Lay out the half-pins at each edge first, then step off the tail centers from the printable list below the calculator. Mark the tails, cut them, then use the tails to mark the pins for a perfect match.
Frequently asked questions
How many pins for how many tails?
Always one more pin than tails, because the joint starts and ends with a half-pin. Four tails means five pins.
What dovetail angle should I use?
1:6 (about 9.5 degrees) for softwoods, 1:8 (about 7.1 degrees) for hardwoods. 1:7 is a safe all-round choice.
Should pins be narrow or wide?
It is aesthetic. Narrow pins signal hand work and look delicate; wider pins are faster, stronger in some woods, and what most router jigs produce.
Do half-blind dovetails use different spacing?
No. The spacing layout is the same; only the depth of the pin sockets changes, usually about two-thirds of the board thickness.
How do I keep the layout symmetrical?
Start with a half-pin at each edge and keep the tails equal. The calculator does this automatically and the preview shows the result before you cut.
Can I use this for a sliding dovetail?
Yes. Switch the style to sliding and the tool shows a single dovetail groove with its top and bottom widths and angle instead of a row of pins and tails.
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Layouts are a starting point for hand or machine cutting. Always scribe to your actual board thickness, account for your saw kerf and chisel work, and cut a test joint in scrap before committing your finished stock.