A three-legged stool is one of the most satisfying beginner-to-intermediate woodworking projects you can build. It requires just three legs, a solid seat, and simple joinery, yet the result is a piece of furniture that sits flat on any surface without wobbling. Here’s how to build one from scratch.
Why Three Legs Work
Three points always define a plane, which means a three-legged stool can never rock on an uneven floor. A four-legged chair needs all four feet to touch the ground simultaneously, or it wobbles. A tripod stool skips that problem entirely. This makes it a forgiving project: even if your cuts aren’t perfectly precise, the finished stool will sit stable.
The key to that stability is leg splay. Legs that angle outward from the seat create a wide base of support. A 14-degree splay angle is a reliable standard that gives the stool a visually balanced look while keeping it from tipping during normal use. Less splay and the stool feels precarious; much more and the legs stick out far enough to become a tripping hazard.
Choosing Your Wood
Hard maple is the traditional choice for stool legs and stretchers. It’s extremely hard, resists denting from daily use, and doesn’t splinter. Early chairmakers used it almost exclusively for good reason. White oak is another strong option, especially if you want visible grain character. It’s resilient, hard, and bends well if you ever want to add a curved back later. Hickory works too, particularly for legs and stretchers, though it can be tougher to work with hand tools.
For the seat, you have more flexibility. A thick slab of pine or poplar is easy to shape and light enough to carry around, though it will dent more easily over time. If you want durability throughout, use the same hardwood for the seat as the legs. A seat thickness of 1.5 to 2 inches gives you enough material to house the leg joints securely.
Dimensions to Start With
Your stool’s height depends on where you plan to use it. For a standard sitting stool (workbench, milking stool, shop stool), a seat height of 18 to 20 inches works well. If you’re building a counter-height stool to pair with a kitchen island, aim for 24 to 27 inches. Bar stools sit higher at 28 to 33 inches, though a three-legged design at bar height needs especially aggressive splay to stay stable.
A round seat between 11 and 14 inches in diameter is comfortable for most adults. Legs are typically 1 to 1.25 inches in diameter if turned on a lathe, or about 1.25 inches square if you’re working with hand tools and a drawknife. Keep in mind that the splay angle adds effective height, so your raw leg length needs to be slightly longer than the finished seat height. For a stool with 14-degree splay and an 18-inch seat height, legs around 19.5 to 20 inches before trimming give you room to level them after assembly.
Drilling the Leg Holes
This is the step that makes or breaks the project. Each leg hole in the seat needs to be drilled at that 14-degree angle, and the angles need to splay outward evenly, which means each hole points in a different direction. You’re effectively drilling compound angles: the bit tilts both front-to-back and side-to-side relative to the seat.
The simplest approach is to build a small drilling platform. Cut a short piece of 2×4 at your compound angle on a miter saw (set both the miter and the bevel to match your splay), then slice off a 2-inch section. Tape this angled block to a flat MDF base, set your seat on top of it (top side up), and the platform tilts the seat so you can drill straight down with a drill press while the hole enters the seat at the correct angle. After drilling the first hole, rotate the seat 120 degrees for each subsequent hole to space the three legs evenly.
Use a Forstner bit sized to match your tenon diameter. Forstner bits cut clean, flat-bottomed holes and don’t wander like twist bits. Take light passes and clear chips frequently, especially as the bit is about to break through the bottom of the seat. If you don’t have a drill press, you can clamp a wooden guide block with a hole drilled at 14 degrees to the top of the seat and use it to steer a handheld drill.
Mark your hole locations before you start. For a round seat, find the center, then mark three points evenly spaced around a circle about 3 to 4 inches from the edge. A protractor or a compass makes quick work of dividing the circle into three 120-degree segments.
Shaping the Legs
If you have a lathe, turn each leg to a consistent diameter with a slight taper toward the bottom. The top of each leg gets a round tenon sized to fit snugly into your drilled holes. A tenon about 1 inch in diameter and 1.5 inches long is a solid starting point for a stool this size.
Without a lathe, you can shape octagonal or round legs using a drawknife, spokeshave, or even a block plane. Start with square stock, knock off the corners to make an octagon, then round it further. The tenon at the top can be shaped with a tenon cutter (a specialized tool that works like a large pencil sharpener) or carefully with a rasp and sandpaper. What matters most is that the tenon fits tightly in its hole. Aim for a fit where you can start the tenon by hand but need a mallet to seat it fully.
Joinery That Lasts
A standard round tenon glued into a round hole (a mortise) handles the downward and sideways forces of sitting just fine. Its one vulnerability is pull-out: a strong enough upward force could extract the tenon, since only glue resists that direction. For a stool that gets picked up by its seat dozens of times a day, that matters.
A wedged through-tenon solves this. Instead of stopping the leg hole partway through the seat, you drill all the way through. The leg tenon pokes out the top of the seat by about a quarter inch. You then cut a slot in the exposed tenon end and drive a small hardwood wedge into it, flaring the tenon open like a rivet. The mortise hole is slightly widened on the top side to accept this flare. Once wedged, the joint physically cannot pull apart. It’s locked mechanically, not just chemically.
To cut the wedge slot, use a fine handsaw to make a single kerf across the tenon’s end grain, about three-quarters of the way down the exposed tenon. Orient the slot perpendicular to the wood grain of the seat so the wedge pushes the tenon open without risking a split in the seat. Cut your wedges from a contrasting hardwood for a visual accent, or from the same species to keep things subtle. Each wedge should be slightly longer than the tenon protrudes and tapered to a thin edge.
Glue-Up and Assembly
Standard PVA wood glue (yellow carpenter’s glue) is the right choice for tight-fitting wood-to-wood joints like these. It’s stronger than the surrounding wood fibers when the joint fits well, it’s inexpensive, and cleanup is easy. Avoid polyurethane glue here. It foams as it cures, which is useful for gap-filling on rough joints but creates a mess inside precision mortises and doesn’t add strength when surfaces are already in full contact.
Apply glue to both the tenon and the inside of the mortise. Tap each leg into place with a mallet, working quickly since you need to get all three legs in before the glue starts to grab. If you’re using through-wedged tenons, drive the wedges in while the glue is still wet, applying glue to the wedges as well. Wipe away squeeze-out with a damp rag immediately.
Once the glue has cured (at least 24 hours for full strength), trim the protruding tenon ends and wedges flush with the seat using a flush-cut saw, then sand smooth.
Leveling the Legs
After assembly, set the stool on a known flat surface like a table saw top or a granite countertop. If one leg is slightly long (common when drilling compound angles by hand), mark the high spot. The simplest leveling method: set the stool on a flat surface, slide a thin shim under the short leg or legs until the seat is level, then scribe all three legs at floor height using a pencil held flat on the surface. Cut each leg at the scribed line and all three will meet the floor evenly.
Finishing for Durability
A stool sees constant friction from clothing, hands gripping the seat, and feet scuffing the legs. Oil-based polyurethane varnish is the most durable option for this kind of wear. It resists moisture, scratches, and general abrasion, and it’s available in finishes from matte to high gloss. Two to three coats with light sanding between each coat (220-grit) builds a tough, smooth surface.
If you prefer a more natural look, water-based polyurethane dries faster, has less odor, and won’t yellow over time the way oil-based versions can. It’s slightly less durable, but for a stool that lives indoors it’s more than adequate. A hard-wax oil is another option if you want a matte, close-to-the-wood feel, though it needs reapplication every year or two on high-contact surfaces.
Sand the entire stool to 180 or 220 grit before applying any finish. Pay special attention to the seat edges and any sharp corners on the legs, rounding them slightly so they’re comfortable to touch and less likely to chip.