How to choose an ergonomic office chair

Start with how you will use it

Before comparing models, be clear about who will sit in the chair and for how long. A chair for one person working full-time at a desk needs more adjustment than a meeting-room chair used for an hour at a time. If several people will share the chair, such as hot desks or a reception, adjustability matters even more, because it has to fit a range of body sizes.

• Hours per day: under 2 hours, 2–6 hours, or a full working day
• One regular user or several people of different heights
• Main task: typing, drawing, calls, or a mix
• Your height and weight, since most chairs list a recommended user range and a maximum load

The adjustments that matter most

These four adjustments do most of the work of keeping you comfortable. If a chair lacks one of them, it should be because you have a specific reason not to need it.

• Seat height: you should be able to sit with your feet flat on the floor and your thighs roughly level. Check the seat's minimum and maximum height against your own lower-leg length, not just the average.
• Lumbar support: the backrest should support the inward curve of your lower back. Adjustable lumbar support (height, depth or both) lets you place it where your back actually curves.
• Seat depth: with your back against the backrest there should be a gap of roughly two to four fingers between the front edge of the seat and the back of your knees. A sliding seat lets taller and shorter people get this right.
• Recline with tension control: being able to lean back and move during the day reduces strain. A tension knob lets you match the resistance to your weight, and a lock holds an upright position for focused typing.

Armrests

Armrests should let your shoulders relax with your elbows at roughly a right angle. Height-adjustable arms are the minimum for full-time use; arms that also move in and out or pivot (often called 3D or 4D arms) help narrower and broader users and different desk setups. If your armrests stop you from pulling close to the desk, lower them or choose a chair whose arms can be removed.

Backrest, seat and materials

A taller backrest with a headrest suits people who recline often or spend long periods on calls; it is less important for upright typing. Mesh backs stay cooler in warm rooms; padded fabric or leather backs feel softer but hold more heat. For the seat, look for a waterfall (rounded) front edge, which reduces pressure behind the knees, and foam that is firm enough not to bottom out after months of use.

Base, castors and build quality

A five-star base is the standard for stability. Choose castors for your floor: hard castors for carpet, soft or rubber-tread castors for wooden or tiled floors to avoid scratches. Check the stated weight capacity and the warranty: longer warranties on the gas lift, mechanism and frame are a useful sign of how long the maker expects the chair to last.

A quick checklist before you buy

• Seat height range suits your leg length and desk height
• Lumbar support is adjustable or sits naturally in your lower back
• Seat depth leaves a small gap behind your knees
• Armrests adjust at least up and down and don't block the desk
• Recline and tension can be adjusted and locked
• Castors suit your floor and the weight capacity suits the user
• Warranty covers the mechanism and gas lift, not just the frame

When you contact a vendor, ask for the seat height range, seat depth, weight capacity and warranty terms in writing, and whether you can try the chair or a similar model before buying several.

Common mistakes to avoid

• Buying on looks or the word “ergonomic” alone, without checking the adjustment ranges
• Choosing a seat that's too deep for shorter users, which pushes them forward off the backrest
• Ignoring the desk: a great chair at the wrong height for your desk still leads to hunching
• Skipping the tension adjustment, so the recline is either stuck or throws you back
• Expecting cushioning to fix posture: very soft seats often feel good for ten minutes and poor after two hours