How to adjust your office chair correctly: 6 steps to pain-free sitting

Adjusting an office chair correctly means adapting it systematically to your body from bottom to top: first the seat height, then the seat depth, followed by the lumbar support, the backrest resistance and finally the armrests. Only in this order will the chair actually support your spine in its natural shape – and that is precisely the basic requirement for preventing back pain, tension and circulation problems in your daily office routine.

Most office chairs do not fail because of poor technology, but because of incorrect adjustment. A chair with a synchronous mechanism and lumbar support is of no benefit if the seat height is set incorrectly or the backrest is fully locked. The following guide takes you through all the relevant settings in the biomechanically correct order.

The perfect adjustment sequence: 6 steps to an ergonomic workstation

Each step builds on the previous one – which is why the order is crucial. If you adjust the armrests first and then change the seat height, you will have to set everything up again.

Step 1: Adjust the seat height

Stand in front of the chair and bring the seat to knee height. Then sit down and check:

The knee angle is at least 90°, ideally slightly more (the thighs slope very slightly downwards towards the front)
Your feet are flat and fully on the floor
There is still room to move between the seat and the back of your knees

Why this matters: A knee angle that is too small (under 90°) increases pressure on the discs in the lower back because the pelvis tilts backwards. If your feet are dangling in the air, on the other hand, your full body weight rests on the backs of your thighs – reducing venous return and encouraging swelling in the legs.

Step 2: Adjust the seat depth / sliding seat

Move your bottom right back to the backrest and check the distance between the front edge of the seat and the back of your knees:

A gap of 2–3 finger widths is ideal
With a sliding seat, the seat can be moved forwards or backwards accordingly

Why this matters: If the front edge of the seat presses into the back of your knees, it compresses the vein that runs there – encouraging blood pooling and, in the long term, varicose veins. If the seat depth is too great, the lower back loses contact with the backrest and the lumbar support becomes completely ineffective.

Step 3: Adjust the backrest & lumbar support

The lumbar support – the curve in the backrest – must sit exactly at the height of the lumbar spine, roughly in line with your belt:

Adjust the backrest height so that the curve makes noticeable contact with the lower back
If the curve intensity is adjustable, choose enough pressure to support the natural lordosis (the slight inward curve of the lumbar spine), without pushing too hard

Why this matters: If the support sits too high or too low, the lumbar spine loses its natural shape and rounds out – increasing pressure on the discs between the lumbar vertebrae L4 and L5 increases noticeably. This exact area is most commonly affected by slipped discs.

Step 4: Adjust the tension of the synchronous mechanism

The tension (also called backrest resistance) determines how much resistance the backrest provides when you lean back:

Set the resistance so that the backrest supports your upper body gently, but noticeably
Too little resistance: the backrest "gives way" backwards when you lean back
Too much resistance: the backrest constantly pushes you forwards when sitting normally

Why this matters: Only with the correct tension setting can the synchronous mechanism do its job – following the movement of your upper body instead of restricting it. A permanently locked or incorrectly adjusted backrest forces the back muscles to work against the chair all the time instead of being relieved.

Step 5: Adjust armrest height & depth

Sit upright, let your shoulders hang loosely, and adjust the armrests so that:

Your forearms rest horizontally on the armrests
There is an angle of around 90° at the elbows
Your shoulders remain completely relaxed and are not raised

Why this matters: If the armrests are set too low, the shoulders drop and the upper body tilts to one side. If they are too high, the shoulders are involuntarily pulled upwards – both overload the trapezius muscle and are among the most common causes of neck and shoulder tension in everyday office work.

Step 6: Adjust the headrest / neck support

If the chair has a headrest or neck support, this is adjusted last:

Set the height so that it supports the back of the head or upper neck area, not the middle of the back
Most effective when sitting in a slightly reclined position, for example during phone calls or reading breaks

Why this matters: A correctly positioned neck support relieves pressure on the cervical spine during rest phases and prevents the head from tipping backwards uncontrollably when leaning back.

Typical adjustment mistakes & how to avoid them

The following overview shows the most common incorrect settings and their immediate physical effects:

Incorrect setting	Physical symptom / consequence	How to do it correctly
Seat position too high	Numbness and tingling in the legs due to pressure on the backs of the thighs	Set the seat height so that your feet are fully flat on the floor
Backrest permanently locked	Muscle tension in the lower back, increased pressure on the discs	Release the synchronous mechanism and adjust the tension to suit your body weight
Armrests too low	Raised shoulders, neck and shoulder pain	Adjust the armrests to the height of your relaxed forearms with a 90° elbow angle
Incorrect lumbar support height	Rounded back, increased pressure on the L4/L5 discs	Position the curve exactly at belt line / lumbar spine height
Seat depth too great	No back contact with the backrest, lumbar support ineffective	Use the seat slider until there is a 2–3 finger-width gap behind the knees

The interaction between office chair and desk

The desk height is always adjusted after the office chair – not the other way around. The reason: the seat height is determined by the knee angle and the feet on the floor, i.e. by fixed anatomical measurements. The desk height, on the other hand, can be adjusted to this already correct sitting position so that the forearms can rest on the desktop at a 90° angle without raising the shoulders.

What if the desk is not height-adjustable? In this case, the seat height remains the fixed reference point – the chair is still adjusted correctly, even if this means the feet no longer fully reach the floor. The solution is an ergonomic footrest: it compensates for the difference without having to reduce the seat height at the expense of the arms and shoulders.

Dynamic sitting & the 60-30-10 ergonomics formula

Even the perfectly adjusted sitting position becomes a problem if it is maintained rigidly for hours. Intervertebral discs are supplied with nutrients only through movement – anyone who remains motionless in the same posture for hours interrupts this very supply mechanism.

That is why correct adjustment also includes correct use:

Consciously switch between forward, central and reclined sitting positions throughout the day
Use the synchronous mechanism as intended – moving with you, not locked
Regular short posture changes instead of holding one "perfect" position for hours

The 60-30-10 formula summarises the ideal balance for a healthy working day in the office:

60% dynamic sitting – at the desk, with changing postures
30% standing – for example at a height-adjustable sit-stand desk during phone calls or while reading
10% targeted movement – short walks, stretching breaks, stairs instead of the lift

Conclusion & quick checklist: your way to pain-free working

The correct adjustment always follows the same logic: from bottom to top, step by step, without skipping a single point.

Quick checklist to apply:

✔ Seat height: feet flat on the floor, knee angle at least 90°
✔ Seat depth: 2–3 finger-width gap between the front edge of the seat and the back of the knees
✔ Lumbar support: curve positioned at belt-line height
✔ Backrest tension: backrest supports gently without tipping away backwards or pushing forwards
✔ Armrests: forearms horizontal, shoulders relaxed, elbows at a 90° angle
✔ Desk height: adjust only after the chair; alternatively, use a footrest
✔ Movement: 60% dynamic sitting, 30% standing, 10% targeted movement

However, a chair can only offer these adjustment options if the seat height, seat depth, lumbar support, backrest resistance and armrests can actually be adjusted independently of one another. In the range at hjh-office.co.uk, you’ll find fully adjustable ergonomic office chairs that offer exactly this individual adaptation to body size and sitting habits – the basis for a truly pain-free workplace.

adjust your office chair correctly