How High Should Your Desk Be?

Your desk is at the right height when your elbows sit at roughly 90 degrees with your shoulders relaxed, your forearms roughly parallel to the floor, and your feet flat on the ground. For most adults that lands somewhere between 24 and 28 inches seated — which means the standard 29-inch desk almost everyone owns is too tall for the majority of people who sit at one.

Measure yours in two minutes

You need a chair and a tape measure. Do it in the shoes you actually wear at your desk.

1. Sit in your chair with your feet flat on the floor and your knees at roughly 90 degrees. If your feet do not reach the floor, lower the chair until they do — you are measuring your body, not your current setup.
2. Let your upper arms hang straight down at your sides, then bend your elbows to 90 degrees so your forearms are parallel to the floor.
3. Measure from the floor to the underside of your elbow. That number is your ideal seated typing surface height.
4. Now stand, repeat the elbow position, and measure from the floor to the underside of your elbow again. That is your ideal standing surface height.

Two things to note. First, the target is the height of the keyboard surface, not the desktop — a thick keyboard on a thick desk adds up. Second, subtract half an inch or so for a comfortable keyboard, since your fingers rest slightly above the surface.

Rough figures, if you just want a starting point

Measured numbers beat a chart every time, but as a sanity check: seated desk height for most adults lands in the 24 to 28 inch range, and standing height in the 38 to 46 inch range. Taller people sit near the top of the seated range and stand near the top of the standing one. If your measured number is wildly outside those bands, re-measure — it is usually a chair set at the wrong height distorting the seated figure.

The gap between your seated and standing numbers matters when you shop. It is typically 12 to 16 inches, which is why a sit-stand desk needs a genuinely wide travel range rather than the minimum a spec sheet can claim. Check both ends of a desk’s range against your two numbers before buying — a frame that stops two inches above your seated target is a standing desk you will only ever stand at. The ranges are compared in the standing desks roundup.

Why 29 inches became standard, and why it does not fit you

The 29 to 30-inch desk height is a historical convention inherited from office furniture designed around typewriters and mid-century average male stature, not an ergonomic finding. It is a manufacturing default that stuck. For someone under about 5’10”, it typically sits an inch or three too high, and the compensations are predictable: shoulders raised to reach the keyboard, which shows up as neck and upper back tension, or the chair raised to fix the elbows, which leaves the feet dangling.

What to do when the desk cannot move

Most people reading this have a fixed desk, so this is the section that matters. Three fixes, in order of how well they work.

• Raise the chair, then support the feet. Set the chair so your elbows are correct at the desk, then put a footrest under your feet to close the gap. This is the standard fix, it costs little, and it works. What it does not fix is a desk so tall that your thighs no longer clear the underside.
• Fit a keyboard tray. An under-desk trayputs the typing surface two to four inches below the desktop, which is the only way to get the keyboard genuinely lower on a fixed desk. It costs you the ability to write on the desktop at the same time, and it needs a clear underside — something a desk with a drawer pedestal may not have.
• Cut the legs. Genuinely viable on a cheap fixed desk with straight legs, and it is permanent. Measure twice, and check whether the legs are the structural element before you start.

What does not work is lowering the chair to fix a too-low desk — that collapses your hip angle and pushes you into a slouch. If the desk is too low, raise it on risers rather than dropping yourself to meet it.

Standing height is a different number, and people get it wrong

The most common standing-desk mistake is setting the surface too low, because people raise the desk until it “feels like a counter” rather than until their elbows are at 90 degrees. A kitchen counter is around 36 inches, and for most people the correct standing typing height is meaningfully higher than that — commonly 40 to 44 inches. Set it from the measurement, then trust the measurement over the feel for the first week.

The second thing to get right is the monitor, because raising the desk raises the screen with it. If your monitor was at the correct height seated, it is now several inches too high standing — unless it is on an arm you can drop independently. This is the strongest practical argument for a monitor arm on a sit-stand desk: it is the only way to keep the screen at eye level in both positions. The target itself is in the monitor height guide.

And standing all day is not the goal. The useful pattern is alternating — the best posture is the next one — which is the argument laid out in standing desk vs sitting. If you do stand for long stretches, an anti-fatigue mat matters more than most people expect on a hard floor.

A worked example, because the numbers are easier to see applied

Take someone 5’6”. Seated with their feet flat and knees at 90 degrees, the floor to the underside of their elbow measures about 25 inches. Their standard desk is 29 inches. That is a four-inch mismatch, and it has to go somewhere.

If they lower the chair to bring their elbows level with the desk, they cannot — the desk is above their elbow height regardless of chair position, so instead they raise the chair four inches to bring their elbows upto the desk. Now their elbows are right and their feet are four inches off the floor. A four-inch footrest closes that, and the setup works. The alternative is a keyboard tray that drops the typing surface to 25 inches, letting the chair come back down to where their feet reach the floor unaided — a better solution, and a more expensive and permanent one.

Now the same person standing: floor to elbow measures about 41 inches. If they buy a sit-stand desk, they need a frame whose range covers 25 inches at the bottom and 41 at the top. Plenty of budget frames start at 28 or 29 inches, which would leave them exactly where they began. This is the check people skip, and it is why the bottom of the range matters as much as the top.

Height is one of two dimensions that decide whether a desk works, and the other one gets far less attention: depth. It sets whether a wide monitor can sit far enough back to be comfortable and whether your knees clear what is mounted underneath, and a standard 24-inch top loses most of itself to the wall gap, the monitor stand and the keyboard zone. That arithmetic is in how deep a desk should be.

Desk thickness, keyboards, and the inch you forget

Two things sit between the number you measured and the surface your hands actually rest on. First, the desktop has thickness — if you are fitting an under-desk keyboard tray, the tray hangs below a top that is typically three-quarters of an inch to an inch and a half deep, so the usable typing height is lower than the desk height by more than the tray’s own drop. Second, the keyboard itself has height: a tall mechanical board can add three-quarters of an inch to where your fingers sit compared with a low-profile one.

In practice that means a tall keyboard on a desk that was already slightly too high compounds the problem, and choosing a low-profile board is a legitimate partial fix for a fixed desk you cannot lower. The board height and wrist angle side of this is covered in keyboard and mouse ergonomics, and a wrist restmatched to your board’s height closes the last part of it.

Set everything in the right order

Desk height is the first number in a chain, and setting it out of order means solving for the wrong thing. The sequence is: desk height from your elbows, then chair height so your feet are supported at that desk, then monitor height so the top of the screen meets your eyeline, then keyboard and mouse position. Each step depends on the one before it.

The chair half of that is walked through in how to adjust an office chair, and the hand positions in keyboard and mouse ergonomics. If you are building a setup from scratch rather than fixing one, the whole order of operations is in the complete desk setup guide.