How to Adjust Office Chair | Proper Ergonomic Setup

Most people sit down and start typing without ever touching the levers beneath them. That’s a mistake your lower back pays for by mid-afternoon. The right way to adjust an office chair follows a fixed order: seat height, seat depth, backrest and lumbar support, armrests, then tilt and tension. Work through them in that sequence and each step builds on the last.

Set the Seat Height First

Seat height is the foundation of everything else. Stand beside the chair and raise or lower the seat so its highest point sits about level with your kneecap. Sit down and check: your feet should rest flat on the floor, and your thighs should be level or sloping slightly downward. Your knees should sit near a 90-degree angle, roughly hip level or slightly below.

Use the lever or paddle beneath the seat to make changes. Most chairs adjust while you’re seated — lift the lever and your weight lowers the seat, or remove your weight to raise it. If your feet dangle, the seat is too high. If your knees rise above your hips, it’s too low.

One catch worth knowing: don’t force the chair lower than ideal just to reach the floor. If your feet still don’t rest flat at the correct thigh angle, add a footrest instead.

Adjust Seat Depth and Backrest Support

Sit fully back in the chair and check the gap between the seat’s front edge and the back of your knees. Any less and the seat presses against your calves, which cuts off circulation over a long workday. Chairs with adjustable seat depth slide forward or backward; if yours lacks that control, a seat cushion can help.

Next, set the backrest so it supports your lower back’s natural curve. The lumbar support should sit in the small of your back, fitting the deepest part of that inward curve. Height-adjustable lumbar pads should line up with your belt line. Angle the backrest at a comfortable recline between 90 and 110 degrees, up to 120 if your chair allows it. A slight recline takes pressure off your spine.

The lock it or leave it question depends on your chair. Some ergonomics guidance says never lock the backrest so it moves with you; others recommend using tilt lock when your task calls for a fixed position. Either way, the chair should move naturally when you lean back.

Position Armrests and Tilt the Seat if Needed

Armrests should barely touch your elbows, supporting the undersides of your forearms while your shoulders stay relaxed. Your elbows should sit near 90 degrees. If the armrests force your shoulders up, they’re too high — lower them, or remove them entirely if they can’t go low enough. Raised shoulders create neck and upper-back tension by the end of the day.

Some chairs let you tilt the seat pan itself. For keyboard work, a slight forward tilt can be comfortable, keeping your hips open and your back engaged. Check your final settings while actually typing, not just while sitting idle.

This is the moment to evaluate the whole setup: your elbows at the desk, your screen at eye level, your feet grounded. If the chair can’t get you there no matter what you adjust, the workstation needs attention — raise the desk, add a footrest, or consider a different chair. If you’re shopping for one that fits your frame, our guide to the best ergonomic chair for back support walks through the options that have the adjustments worth paying for.

FAQs

How long does it take to adjust an office chair properly?

The first time is slowest because you’re experimenting. After that, you can fine-tune in under a minute whenever you switch chairs or desks.

Why does my chair feel uncomfortable even after adjusting it?

The chair is only half the equation. If your desk is too high or low, or your screen isn’t at eye level, no chair setting fixes the mismatch. Check your workstation fit — add a footrest if needed, adjust monitor height, and confirm your elbows rest near 90 degrees at the keyboard.

Should I lock the backrest on my office chair?

For most desk work, leave the backrest unlocked so it follows your movement. Lock it only when your task demands a fixed position, like detailed drawing or sustained reading. A rigid backrest that never moves puts extra load on your spine over time.