How to Sit at a Desk? Setting Up Your Chair, Desk and Monitor

Eight hours at a desk is everyday life for many people - and with it comes a stiff neck, tired shoulders and a "numb" back by the end of the day. Often the culprit is not sitting itself, but a poorly fitted workstation: the chair too low, the monitor off to the side, the keyboard too far away. In this guide we show step by step how to sit at a desk and how to set up your chair, desk, monitor, keyboard and mouse. You will find a table of general ergonomic recommendations (heights, distances and angles), a list of the most common mistakes, a plan for breaks during the day and a few simple movements to do at your desk.

This article is for informational purposes only and does not replace medical advice. If you have symptoms, consult a doctor.

What should a correct sitting posture at a desk look like?

There is no single "ideal" position in which you can sit all day without getting tired. Ergonomics speaks rather of a neutral position - one in which the joints are in the middle of their range of motion and the muscles do not have to work constantly to hold the body in place. At a desk this usually means:

• feet flat on the floor or on a footrest, not dangling in the air or tucked under the chair,
• thighs roughly horizontal, knees at hip height or slightly lower,
• back resting against the backrest, with support in the lumbar area, not perched on the edge of the seat,
• shoulders relaxed, not raised toward the ears, arms hanging freely along the torso,
• elbows bent at roughly a right angle or slightly more open, forearms supported,
• wrists in line with the forearms, not bent up or to the sides,
• head over the torso, eyes directed slightly downward at the screen, without pushing the chin forward.

Just as important as the position itself is changing it. Even the best-adjusted chair will not replace standing up, walking around and changing your body position. We come back to this in the section on breaks.

How to set up an office chair step by step?

Setting up a workstation starts with the chair, because it determines the height at which you sit. Only then are the desk and monitor adjusted to it.

Step 1. Seat height

Sit back fully in the chair and set the height so that your whole feet rest on the floor and your thighs are roughly parallel to it. The angle at the knees should be about 90-100°. If your feet don't reach the floor after matching the height to the desk, use a footrest.

Step 2. Seat depth

Between the front edge of the seat and the back of your knee there should be a few centimeters of free space (often given as 2-4 finger widths). A seat that is too deep forces you to sit on the edge, while one that is too shallow does not support your thighs.

Step 3. Backrest and lumbar support

The contour of the backrest should match your waist, i.e. the natural curve of the lower back. Many people feel comfortable with the backrest tilted slightly back (about 100-110° between the thighs and torso) rather than set perfectly upright. If the chair has no adjustable lumbar support, you can use a lumbar cushion or a rolled-up towel.

Step 4. Armrests

Set the armrests at a height where your forearms rest on them comfortably and your shoulders don't rise. Ideally they should be roughly level with the desktop, so the chair can be pushed in close to the desk.

How to choose the right desk height?

The reference point is elbow height once the chair is set up. The desktop (or more precisely, the keyboard) should be roughly at elbow height or slightly lower, so that your forearms are horizontal and your shoulders stay relaxed. Many standard desks have a fixed height of about 72-76 cm, which does not suit everyone. What then?

• Desk too high - raise the chair and put a footrest under your feet. An alternative is a pull-out keyboard tray.
• Desk too low - with a non-adjustable desk you can use stable risers under the desk legs. Don't hunch over to "reach".
• Height-adjustable desk - lets you match the desktop precisely to your body and alternate between sitting and standing. We compare both positions in the article working standing or sitting.

There must be room under the desktop to position your legs freely - no cabinets, bins or cables to bump your knees on. The desk depth should allow you to move the monitor back to the right distance.

How to position your monitor to avoid straining your neck?

A monitor set too low, too high or off to the side is one of the most common reasons for pushing the head forward and twisting the neck. General rules:

• Straight ahead - the monitor stands directly in front of you, with the keyboard in front of it. If you work on two screens and use both equally, set them up symmetrically, with the join in the middle. If one is the main screen, it goes straight ahead.
• Height - the top edge of the screen at eye level or slightly below. Your gaze is then directed slightly downward at the center of the screen.
• Distance - roughly an arm's length away, usually about 50-75 cm. With large screens it is worth increasing the distance.
• Tilt - tilting the top edge slightly back (about 10-20°) makes it easier to look at the screen without tipping your head up.
• Progressive lenses - people who wear them often need to set the monitor lower so they don't tilt their head back.

Where to put your keyboard and mouse?

• Keyboard - directly in front of you, a few to a dozen or so centimeters from the edge of the desk, so you can rest your forearms. The fold-out feet at the back of the keyboard are often better left folded, as they increase wrist bending.
• Mouse - right next to the keyboard, at the same height. Reaching far to the side or forward engages the shoulder all day long.
• Wrists - in a neutral position. A wrist rest can help during pauses in typing, but it shouldn't be a point on which your whole hand "hangs".
• Frequently used items (phone, notepad, documents) - within reach, without twisting your torso. Documents you are copying from are best placed on a holder between the keyboard and the screen.

Desk dimensions and angles - table

The values below are general ergonomic recommendations found in occupational health and safety guides and materials on setting up computer workstations. Treat them as a starting point - ultimately your body and comfort decide.

What are the most common mistakes when sitting at a desk?

• Sitting on the edge of the chair and leaning toward the screen - the backrest stops supporting anything.
• A laptop on the desk without a stand - the screen is too low, the head bent down for hours.
• A monitor off to the side and a constant twist of the neck in one direction.
• Legs crossed for a long time or tucked underneath you.
• Holding the phone with your shoulder while talking and typing - it is better to use headphones.
• Surroundings that are too dark or too contrasting around the screen, forcing you to squint and lean forward.
• No breaks - many hours without getting up, even at a well-set-up workstation.

Working from home, on the couch or at the kitchen table? We describe the bigger picture of the workstation - lighting, working on a laptop, organizing your day and micro-breaks - in the article what ergonomic computer work is all about.

How often should you take breaks from computer work?

In Poland, regulations on workstations with display screens provide that a person working at a computer is entitled to at least a 5-minute break after each hour of work, counted as working time (or to alternate with other tasks). That is the minimum. In practice, many people respond well to more frequent, very short changes of position, e.g.:

• every 20-30 minutes - a few seconds to change position, straighten up, look away from the screen and into the distance,
• every hour - stand up, walk to get some water or to the window, do a few relaxed movements,
• during the day - phone calls standing or on the move, "walking" meetings, a printer in another room.

A reminder on your phone or calendar helps. Breaks don't have to be long - what counts is regularity.

Simple movements at your desk

During a break you can do a few calm movements. Do them without pain, and if you have any complaints, consult a doctor or physical therapist first.

• Shoulder rolls - slowly raise your shoulders, roll them back in a circle and lower them. 5-10 times.
• Chin tucks - sitting upright, gently pull your chin back as if making a "double chin", without tilting your head. Hold for 2-3 seconds, 5-8 times.
• Shoulder blade squeezes - gently draw your shoulder blades together and down, hold for a few seconds, relax.
• Seated stretch - sit in the middle of the seat, raise your arms overhead, "reach" upward and calmly lower your arms.
• Foot movements - while seated, alternately raise your toes and heels, a dozen or so times.
• A short walk - even 2-3 minutes of walking around your home or the hallway.

You will find more neck exercises in the article gentle neck exercises, and exercises for the lower back in the guide stretching the lower back.

What to do after work if you sit all day?

An ergonomic workstation is half the story. The other half is movement away from the desk. General physical activity guidelines for adults recommend at least 150-300 minutes of moderate activity per week and muscle-strengthening exercises several times a week. It doesn't have to be the gym - walking, cycling, swimming, dancing or working out at home all count. For people who prefer to exercise at home, Teeter offers FreeStep trainers - recumbent cross trainers you use in a reclined seated position, with a backrest, moving your arms and legs smoothly. You will find ideas for a weekly movement plan for people who sit at work in the article a home movement plan for people who sit a lot.

When do complaints from office work require a doctor's visit?

Many people experience fatigue and stiffness at the end of the day. However, consult a doctor if your symptoms last several weeks, get worse, wake you up at night or don't go away over the weekend. Symptoms requiring urgent assessment include numbness or weakness in the arms or legs, pain after an injury, pain with fever, and balance or vision problems. Ergonomics helps you take care of your comfort at work, but it does not replace a diagnosis.

Frequently asked questions

How should you sit at a desk?

With your feet flat on the floor, thighs roughly horizontal, back resting against the backrest with lumbar support, shoulders relaxed and elbows bent at close to a right angle. Your head should be over your torso, with your eyes directed slightly downward at the screen.

At what height should the monitor be?

The top edge of the screen roughly at eye level or slightly lower, at a distance of about 50-75 cm. People who wear progressive lenses often need to set the monitor a little lower.

What is the right desk height?

One where the desktop or keyboard is at elbow height (or slightly lower) once the chair is set up. If the desk is too high, raise the chair and use a footrest.

Is sitting on a ball instead of a chair a good idea?

A ball can be an option for shorter periods to vary your position, but it has no backrest or armrests. Many people use it alternately with a chair rather than all day. An unstable seat, e.g. a wedge cushion, works in a similar way.

How often should you get up from your desk?

Regulations provide for at least a 5-minute break after each hour of work at a screen. In addition, it is worth changing position and looking into the distance every 20-30 minutes, and standing up and walking around every hour.

Do you need a footrest?

Yes, if your feet don't rest flat on the floor after matching the chair height to the desk. This often applies to shorter people at fixed-height desks.

Is an expensive ergonomic chair enough?

No. The chair must fit your body and be set up correctly, and you also need breaks and movement during the day. A well-adjusted ordinary office chair can be better than an expensive one that is set up badly.

When should you see a doctor about back or neck pain from sitting?

When your symptoms last several weeks, get worse or make daily life difficult, and urgently - with numbness or weakness in the limbs, pain after an injury, fever, or balance or vision problems.