Bench height: the standard number is wrong for most people
Thirty-four to thirty-six inches is the figure every plan repeats. It is not a measurement of anything — it is a compromise that suits a particular height of person doing a particular mix of work.
Bench height is the one dimension on a shop build that is genuinely personal and almost always copied from a plan. It is also the one that is painful to change afterwards, because the legs are joined into the top.
Worth getting right the first time, and getting it right takes about two minutes of measuring.
Height is about force, not comfort
The reason a plane needs a low bench and a dovetail needs a high one is not preference. It is where your body can put force.
Hand planing is a horizontal push driven from the legs and hips, with body weight over the tool. That requires the work to sit low enough that your arms stay roughly straight and your shoulders stay above the plane. Raise the bench and the push becomes an arm movement, which tires in minutes and loses the downward pressure that keeps the sole flat.
Joinery is the opposite. Cutting a dovetail is a precision task done with the eyes close to the line, and the limiting factor is seeing clearly without bending your neck for an hour. That wants the work near chest height.
These two requirements are forty centimetres apart and cannot both be met by one surface. Which is why the standard number is a compromise, and why many shops end up with two surfaces at different heights rather than one average one.
Measuring yours
Stand straight, shoes on, arms hanging loose at your sides. Have someone measure from the floor to the crease of your wrist.
hand planing, heavy stock removal — W minus 1 to 2 in.
general bench work, assembly — W
joinery, carving, detail — W plus 4 to 6 in.
For a person around 5 ft 10 in., W usually falls near 33 to 34 in.
Note what that means: the 34 to 36 in. standard is already above the planing height for a person of average height. If your bench feels like it fights you when you plane, that is why — and it is not a flaw in your technique.
Taller people get the opposite problem. At 6 ft 3 in., a 34 in. bench means stooping for every operation, and the back pays for it.
The constraint nobody mentions until it is too late
If your bench sits near your table saw, its height stops being a free choice. A bench at exactly the saw's table height becomes outfeed support, which is genuinely useful in a small shop. A bench an inch higher catches the workpiece and stops the cut.
Most table saws sit around 34 to 36 in. at the table. If you want the bench to serve double duty, measure your saw and match it — or deliberately go an inch lower, which still supports the work and never catches.
Same logic applies to a planer or jointer outfeed. Decide before you cut the legs whether the bench is a work surface or part of the material-handling path, because it cannot be optimised for both.
Build it long, then cut it down
The practical approach: build the legs an inch or two over your calculated height and work on it for a few weeks before trimming.
Taking an inch off four legs is twenty minutes. Adding an inch is a repair. And the number you calculate from a measurement is a starting point — the number you arrive at after planing a dozen boards is the real one.
If you use a bench mat or a sacrificial top, add its thickness to the calculation. A quarter inch of hardboard sounds like nothing and is not, because the whole point of this exercise is a tolerance of about an inch.
The same reasoning, one room over
None of the logic above is specific to woodworking. It is a general argument that working-surface height should follow the task and the body rather than a convention, and it applies just as directly to a desk.
The standard desk height is 29 to 30 in., and it comes from roughly the same place as the 34 in. bench — a mid-century compromise for a typing posture that most people no longer use. For keyboard work the relevant measurement is seated elbow height, not a standard; for a monitor it is eye level to the top third of the screen.
Which is worth knowing if you are considering building a desk, because the one advantage of making your own is that you are not obliged to reproduce a number that was never measured on you. That is a longer subject and one we will take up separately, with the hardware options and the top thicknesses that actually hold up.