An office chair can be good on paper and still feel bad if it is adjusted poorly. Most people set the height once, ignore the rest of the controls and then blame the chair when the lower back, shoulders or neck start complaining.
Adjusting an office chair properly takes about five minutes if you know the order. The problem is that chair levers are rarely labelled clearly. Some controls hide under the seat, some are wheels, some are paddles, and many people never discover half of them.
This guide walks through the practical sequence: identify the controls, set the chair from the floor upward, and troubleshoot the two common mechanical faults: a chair that sinks and a backrest that falls backward.
Before adjusting: identify the controls
Look under the chair. Most controls are below the seat pan, not on the visible backrest.
You may find:
- Seat-height lever: usually on the right side.
- Tilt-lock lever: locks or releases backrest movement.
- Recline-tension knob: a large round wheel under the seat.
- Armrest buttons: control height, width, depth or angle.
- Seat-depth lever: lets the seat slide forward or backward.
- Lumbar adjustment: wheel, slider or moving pad on the backrest.
- Backrest-height control: on some chairs, the whole backrest moves.
If your chair only has two controls, you are not missing something. Basic chairs simply do not adjust as much. In that case, get the most from height and backrest position, then compensate with a footrest or cushion where needed.
Prepare the desk first
Before changing the chair, clear enough space to sit normally. Move bags, boxes and cable clutter away from the foot area. Put keyboard and mouse where you actually use them. If the chair cannot roll in because the armrests hit the desk, note that now.
You are adjusting a workstation, not an isolated chair. The same seat height can feel correct or wrong depending on desk height, keyboard thickness and whether your feet can rest flat.
Use the shoes or slippers you normally wear while working. A chair adjusted barefoot can feel different when you work with shoes, and the opposite is also true.
The correct adjustment order
The order matters. If you set armrests before seat height, you may redo them. If you set lumbar support before seat depth, your back may not sit where you expect.
Work from the floor upward:
- Seat height.
- Seat depth.
- Lumbar support.
- Armrests.
- Recline tension.
- Tilt lock.
- Screen and keyboard position.
1. Set seat height
Sit all the way back in the chair. Place both feet flat on the floor. Raise or lower the seat until your thighs are roughly parallel with the floor and your knees are close to a right angle, or slightly open.
Correct signs:
- Feet rest flat.
- Knees are not higher than hips.
- The front edge of the seat does not press behind the knees.
- Shoulders stay relaxed when hands reach the keyboard.
If the desk is high and you need to raise the chair, use a footrest if your feet no longer touch the floor. Do not lower the chair so much that you end up reaching up to the desk.
For the full desk relationship, use correct desk and chair height.
If the desk forces the wrong chair height
Many home desks are too high for smaller users. If you lower the chair until your feet are flat, shoulders may rise to reach the keyboard. If you raise the chair for the desk, feet may hang.
In that situation, prioritise arm position and add a footrest. Feet unsupported all day can create leg and lower-back discomfort. A footrest is often cheaper and more effective than replacing the desk immediately.
2. Check seat depth
Seat depth is the distance from the backrest to the front edge of the seat. If your chair has this adjustment, it is one of the most useful controls.
Sit against the backrest. There should be a small gap between the front edge of the seat and the back of your knees, roughly two or three fingers.
If the seat is too deep:
- It presses behind the knees.
- You slide forward.
- The backrest becomes useless.
- Lower-back support disappears.
If the seat is too shallow:
- Thighs lack support.
- Pressure concentrates under the pelvis.
- You may feel less stable.
People outside the “average” height range feel this most. A fixed deep seat can be especially uncomfortable for shorter users.
If your chair has no seat-depth adjustment
You still have options:
- Sit fully back and check whether the edge presses behind the knees.
- Use a lumbar cushion only if it does not push you too far forward.
- Avoid thick cushions that shorten the seat unpredictably.
- Consider whether the chair simply does not fit your body.
If the seat is much too deep, no setting will fully solve it. That is a fit issue, not an adjustment issue.
3. Place lumbar support
Lumbar support belongs in the lower-back curve, not the middle of the back. It should feel like firm contact, not pressure pushing you forward.
If your chair has adjustable lumbar height, move it until it meets the natural curve of the lower back. If it has depth or pressure control, start moderate. Too aggressive can be as annoying as too little.
Quick test:
- Sit all the way back.
- Relax your shoulders.
- Let the lower back meet the support.
- Check whether you can stay there without sliding forward.
If you keep sliding away from the backrest, the seat may be too deep, the lumbar pad may be too high, or the chair may not fit you.
Lumbar support should not force posture
Good lumbar support gives you a place to rest. It should not feel like the chair is shoving your spine into an exaggerated arch.
Too much pressure can make you perch on the front of the seat. Too little support makes you collapse into a rounded lower back. Aim for contact that is noticeable but easy to forget after a few minutes.
4. Set armrests
Armrests should support relaxed elbows without lifting the shoulders.
Start with them low. Place your hands on the keyboard and keep elbows close to the body. Raise the armrests until they just meet your elbows or forearms lightly.
Avoid:
- Armrests so high your shoulders rise.
- Armrests so low they do nothing.
- Armrests that hit the desk and keep you far from the keyboard.
- Wide armrests that force elbows away from the body.
If your armrests rotate or move inward, bring them close enough to support you without crowding the torso. Good armrest height often reduces neck tension because shoulders stop holding unnecessary load.
When removing armrests is better
Some fixed armrests are worse than no armrests. If they prevent you from getting close to the desk, force the elbows outward or keep shoulders raised, remove them if the chair allows it.
Armrests are useful during pauses and light support. They should not determine how far you sit from the keyboard.
5. Adjust recline tension
The large knob under the seat controls how much resistance the backrest gives when you lean back.
If it is too loose, the chair falls backward as soon as you apply weight. If it is too tight, the backrest feels locked even when it is not.
Adjust until the backrest follows you with controlled resistance. You should be able to recline without fighting the chair, but it should also support you once you lean back.
Heavier users usually need more tension. Lighter users usually need less.
6. Use tilt lock intelligently
Tilt lock holds the chair in one position. It can be useful for focused work, but do not treat one locked posture as the goal for the entire day.
A healthier pattern is variation:
- Upright for focused typing.
- Slight recline for reading.
- Movement breaks between tasks.
- Standing or walking during some calls.
The chair should support micro-movement, not trap you in a single “perfect” pose for eight hours.
Common setup mistakes
Only adjusting height. Seat height is important, but lumbar support, depth and arms often decide how the chair feels after several hours.
Sitting on the front edge. This usually means the seat is too deep, lumbar support is wrong, or the desk makes you reach.
Using armrests as shoulder lifts. Armrests should reduce load, not raise the shoulders.
Locking the backrest all day. Some lock is useful, but constant rigidity removes movement.
Ignoring the monitor. A perfect chair cannot fix a screen that is too low.
Keeping the mouse too far away. Shoulder reach becomes neck tension.
7. Match the chair to the screen and desk
The chair does not work alone. After adjusting it, check the rest:
- Keyboard close enough that elbows stay near the body.
- Mouse beside the keyboard, not far forward.
- Screen top area near eye level.
- Text large enough that you do not lean forward.
- Feet supported if the desk forces chair height upward.
If the screen is too low, even a well-adjusted chair will not prevent neck pain. Read neck pain from computer work if that is already happening.
Troubleshooting: my chair sinks
If the chair slowly lowers while you sit, the gas cylinder is usually worn. This is a normal wear part.
Signs:
- The chair rises weakly.
- It drops a few centimetres under weight.
- You need to readjust height repeatedly.
If the seat, backrest and base are still good, replacing the gas cylinder can be cheaper than replacing the whole chair. Check compatibility before buying a replacement and follow the manufacturer’s guidance where available.
Do not keep working on a sinking chair for weeks. The changing height forces you to readjust posture all day, and most people compensate by raising shoulders, sliding forward or leaning toward the desk.
Troubleshooting: the backrest falls backward
If the backrest moves backward too easily, check recline tension first.
Turn the tension knob tighter, usually clockwise. Some chairs need several full turns before you feel a difference.
If the knob turns without effect, the internal mechanism may be damaged. At that point, replacement parts may or may not be worth it depending on chair quality.
Troubleshooting: the chair feels good for one hour, then bad
This usually means the first-sit comfort is hiding a fit problem.
Check:
- Are you sliding forward?
- Are shoulders rising toward the ears?
- Is the seat edge pressing behind the knees?
- Is lumbar support too aggressive?
- Is the monitor pulling your head forward?
- Are you sitting without breaks for too long?
A chair does not need to feel soft to be good. It needs to keep the body supported without constant effort.
How often to readjust
Readjust the chair when:
- Someone else has used it.
- You change shoes or add a footrest.
- You change desk height.
- You add a monitor arm.
- You replace keyboard or mouse.
- Symptoms appear after weeks of comfort.
Small changes in the workstation can make old settings wrong. Treat chair adjustment as maintenance, not a one-time setup.
Quick final checklist
- Feet flat or on a footrest.
- Knees around 90 degrees or slightly open.
- Seat edge does not press behind knees.
- Lower back meets lumbar support.
- Shoulders relaxed.
- Elbows close to the body.
- Armrests do not lift shoulders or block desk access.
- Backrest supports controlled recline.
- Screen height is checked after chair setup.
When the chair cannot be fixed by adjustment
Some chairs simply do not fit.
Adjustment will not save:
- A dining chair used for full workdays.
- A stool with no back support.
- A gaming chair with a loose pillow that never stays in place.
- A chair whose seat is too deep or too shallow for your body.
- A chair whose minimum or maximum height does not match your desk.
- A broken mechanism that no longer holds position.
If months of adjustment still end with daily pain, compare best office chairs under 200 or best ergonomic office chairs.
Buying lessons from adjustment
Adjusting your current chair teaches you what to buy next.
If you cannot get feet flat and arms relaxed, check seat-height range in the next chair. If the seat edge presses behind your knees, prioritise seat-depth adjustment. If lower-back support never lands correctly, look for adjustable lumbar height. If shoulder tension appears every day, armrest range matters.
Do not buy the next chair by category alone. Buy the missing adjustments your body actually needs.
Five-minute maintenance routine
Once a month, run this quick check:
- Raise and lower the seat to confirm the cylinder holds.
- Check that armrests have not shifted.
- Sit fully back and verify lumbar support still lands correctly.
- Recline and confirm tension still supports you.
- Look at the screen and confirm your head is not tilting down.
- Roll the chair and check cables are not in the wheel path.
This matters because chairs drift. Someone else uses the chair, a lever gets bumped, the desk changes, or you add a monitor arm. Small changes can slowly undo a setup that used to work.
If more than one person uses the chair
Shared chairs need a reset habit. If your partner, child or guest changes the height, do not try to “make do” for the rest of the day.
Mark your normal settings if possible:
- Seat height reference against the desk.
- Armrest height.
- Lumbar slider position.
- Recline tension preference.
It may feel excessive, but it prevents the common problem of working for hours in someone else’s chair settings and wondering why your shoulders hurt.
Final advice
Adjusting the chair is the foundation, not the whole ergonomic setup. Once the chair is correct, finish the system: monitor height, keyboard position, mouse distance, lighting and movement breaks.
If pain is already present, pair chair setup with back pain from working at home and desk stretches for office chair work. A chair helps most when the rest of the day supports the same posture goals.
