How to Set Your Desk and Chair Height to Match Your Body

Most desks and chairs are built to a single average size, which means they fit almost nobody exactly. If you’ve ever finished a workday with tight shoulders, a stiff lower back, or wrists that feel tired from typing, the furniture height — not how disciplined your posture was — is very often the bigger factor. None of this is a medical fix; it’s just matching the furniture to the body that has to sit at it for eight hours.

The target: a neutral, relaxed position

The goal of a good desk setup is simple to state: your upper arms hang straight down from relaxed shoulders, your forearms sit roughly level with the desk, and your wrists stay flat rather than bent up or down while you type. When any of those three things is off, something else has to compensate — usually the shoulders creep up, the neck cranes forward, or the lower back rounds — and holding that compensated shape for hours is what tends to feel worse by the end of the day. Getting the numbers close doesn’t guarantee comfort by itself, but it removes one of the most common reasons a desk feels wrong in the first place.

Start from your elbow height, not the furniture

Rather than adjusting your body to fit a fixed desk, work the other way: figure out where your elbows naturally rest, and set the furniture to that. As a standing-height rule of thumb, your resting elbow height is roughly 65% of your total height. Seated, it’s roughly 43% of your height, because sitting lowers your whole upper body relative to the floor. Run those two ratios for someone 170cm tall and the desk height calculator returns a standing desk surface around 110.5cm (43.5in) with a keyboard height of 105.5cm (41.5in), or a seated desk surface around 73.1cm (28.8in) with a keyboard height of 68.1cm (26.8in) and a chair seat height of 42.5cm (16.7in). Those are two genuinely different numbers for the same person, which is exactly why “just raise the desk a bit” guesswork so often lands in the wrong place.

Why the keyboard sits a little lower than the desktop

If your keyboard is exactly at elbow height, typing tends to push your wrists upward into extension, which gets uncomfortable to sustain for hours. Dropping the typing surface a few centimeters below resting elbow height — either with a keyboard tray or by lowering the whole desk slightly below the calculated figure — lets your hands hover naturally over the keys with straighter wrists. The calculator bakes in a 5cm (about 2in) drop by default for exactly this reason, so the “keyboard height” figure it returns is already the lower, typing-specific number, not the same as the desktop height.

Don’t forget the chair

Chair seat height matters just as much as desk height, and it’s often the one people never touch after unboxing. A commonly used rule of thumb puts seat height at roughly a quarter of your total height, which keeps your knees close to a right angle with your feet flat on the floor. For the same 170cm example, that’s a seat height around 42.5cm. If your feet dangle or your knees are pushed up higher than your hips, the seat is probably set too high for you; a footrest or a lower seat setting is usually the simpler fix before touching the desk at all.

Putting it together for a sit-stand desk

If you switch between sitting and standing through the day, work out both target heights separately — they aren’t the same number scaled up or down, because your posture changes shape between the two. For a 170cm person, sitting works out to roughly 73cm and standing to roughly 110cm: a difference of about 37cm, not a small nudge. Most electric sit-stand desks let you save a preset for each height, so once you’ve worked out the two figures you only have to dial them in one time. There’s a full breakdown of how to plan the switch itself — and why it’s worth treating as a comfort habit rather than a fix for anything — in Sit-Stand Desks: Comfort Habit, Not a Cure.

A starting point, not a fixed rule

These ratios are based on population averages, not a measurement of your specific torso and arm length, so treat the numbers as a first setting rather than a final answer. Sit or stand at the calculated height for a few days, and nudge it up or down by a centimeter or two until your shoulders feel genuinely relaxed and your wrists stay flat without you having to think about it. If you’d rather skip the population-average step entirely and measure your own elbow height directly with a tape measure, Measuring Your Own Desk Height Instead of Guessing walks through exactly how, and how the two numbers usually compare.

Common mistakes worth checking for

A few setup mistakes show up again and again, and each is easy to fix once you know to look for it. Armrests set too high push the shoulders up in almost exactly the way an over-tall desk does, so if your chair has them, lower or remove them rather than resting your elbows on top of a fixed rest. A laptop used directly on a desk, with no external keyboard, forces a choice between comfortable screen height and comfortable typing height — it can’t deliver both at once, which is why a separate keyboard and a raised laptop stand solve a problem a laptop alone cannot. And a chair pushed too far from the desk, to make room for crossed legs or a large keyboard tray, often ends up pulling the whole upper body forward into a slouch just to reach the keys.

Wrist rests and keyboard tilt

A wrist rest is meant for resting between bursts of typing, not for resting your wrists on continuously while your fingers are moving — leaning the base of the hand on a pad while typing tends to bend the wrist upward at the exact angle the lower keyboard height is trying to avoid. If your keyboard has flip-out feet on the back edge, it’s usually more comfortable left flat or even tilted slightly away from you (negative tilt) once the desk height is already close to correct, rather than propped up toward you, which pushes the wrists back into extension regardless of how well the desk itself is set.

Test the numbers before you commit to them

A calculated height is a starting point, not a final answer, so it’s worth trying it out before assuming it’s wrong. Set the desk (or the keyboard tray, or a temporary stack of books under a fixed desk) to the calculated figure, then work there for a normal stretch — an hour is usually enough to notice whether your shoulders are creeping up or your wrists are bending. A strip of painter’s tape on a monitor arm post or a keyboard tray slider marking the current setting makes it painless to nudge the height up or down a centimeter at a time and get back to exactly where you were if a change doesn’t help.

If more than one person shares the desk

A desk used by more than one person — partners trading shifts at a home office, or a family computer — usually needs one of two approaches. If the height difference between the two people is small, splitting the difference between their two calculated heights is often close enough for both to be reasonably comfortable. If the difference is larger, an adjustable desk that can actually move between two saved presets is worth the cost over a fixed-height compromise that leaves the shorter or taller person permanently working outside their own numbers. Either way, it’s worth running the calculator for each person individually rather than assuming a single “family” height will suit everyone who sits down at it.

Monitor height rides along with desk height

Once the desk and chair are set, the monitor is usually the next thing out of position, simply because it was placed relative to the old desk height rather than the new one. A screen that sat at a comfortable eye level before a height change can suddenly be too low, pulling the neck down, or too far below where the eyes naturally land. It’s worth checking monitor height and distance together right after adjusting the desk — the monitor distance calculator and the accompanying guide on how far your monitor should sit from your eyes cover that half of the setup.

Reassess when your setup changes

A height that felt right for months can stop working the moment something else changes — a new chair, a different keyboard with a taller profile, or even a new pair of shoes that adds a couple of centimeters to standing height. It’s worth re-running the numbers any time a piece of the setup changes, rather than assuming the old settings still apply. It takes a couple of minutes and avoids weeks of low-grade discomfort before anyone thinks to question the height again. The desk & monitor reference chart is a quick way to sanity-check a recalculated figure against the same ratios for a range of nearby heights, without re-running the calculator from scratch each time.

What a calculator can’t tell you

All of this is comfort guidance based on common ergonomic rules of thumb, not a medical or occupational-health assessment, and everyone’s proportions differ from the population average the ratios are built on. Use the numbers as a considered starting point, then trust how your own shoulders, wrists, and back actually feel once you’ve sat or stood there for a few days — that feedback is more accurate for you specifically than any ratio can be.