How to Choose an Office Chair

By Karim Majid · September 30, 2026 · Buying guide

Choose a chair in this order: check how it fits your body and desk, try the adjustments you will use, and confirm the terms of a real sitting trial. Then decide whether the price makes sense.

This guide combines guidance from OSHA, the Canadian Centre for Occupational Health and Safety (CCOHS), and the UK’s Health and Safety Executive (HSE) with The Karim Standard’s buying judgment. It does not represent TKS physical testing of a particular chair.

Start with three questions

1. Can it fit me at my workstation? Look at usable seat dimensions and adjustment ranges, as well as the space under your desk.
2. Can I use its controls comfortably? A feature matters when you can reach it, set it, and keep the setting you need.
3. Can I return it after checking the fit? Find the actual seller’s policy before paying, including its rules for assembly and sitting trials.

CCOHS emphasizes that chair selection depends on the person’s dimensions and work, and recommends trying suitable chairs in the work situation where they will be used.¹

1. Check your body and your desk together

Before shopping, note your desk height, the clearance underneath it, and any fit problems with your current chair. If a chair already fits you comfortably, its seat height, width, and depth can be useful comparison points.

Check the manufacturer’s measurement diagram. Find out whether a quoted width means the seat itself, the space between the arms, or the chair’s overall width. Check the full adjustment range, including the lowest seat position.

Use these fit checks when comparing a chair’s specifications and when trying it:

These checks reflect CCOHS guidance on chair fit and OSHA’s workstation evaluation checklist.²³

An advertised height range or weight capacity does not settle the fit question. At TKS, these are manufacturer claims to check alongside the chair’s actual geometry. A chair rated for your weight can still have the wrong seat depth, arm spacing, or backrest position for you.

2. Look for adjustments that solve your fit problems

Seat depth and lumbar support

A seat-depth adjustment can help you keep back support while giving your legs the clearance they need. Lumbar support should reach the part of your lower back it is intended to support. OSHA identifies both backrest positioning and usable seat depth as important fit considerations.⁴

Ask exactly what the lumbar control changes: its height, its pressure, or both. During a trial, check whether your preferred setting feels supportive throughout the work you do. TKS treats the number of adjustments as the beginning of the evaluation; their usable range and effect matter more.

Armrests

Try the arms at typing height and when moving closer to the desk. They should support your forearms while allowing relaxed shoulders and a comfortable position near your body. OSHA cautions that poorly placed arms can interfere with positioning at the workstation.⁵

If a listing says “3D” or “4D,” look for a diagram showing the actual movements. Check whether the pads stay in the position you choose, whether both arms adjust as needed, and whether their range works for your desk. Read the manual before relying on removable or folding arms.

Recline and movement

Test the recline tension with your own body weight. Check how easily you can lean back, maintain a supported working position, and return upright. OSHA’s chair guidance calls for back support in different sitting positions and a recline mechanism with suitable locking or resistance.⁶

Ask the seller which positions lock and what the tension control changes. A feature list can help you shortlist a chair; the trial tells you whether you will use it.

3. Give daily usability a real trial

Sit down, stand up, turn toward the desk, and reach the controls you expect to use. OSHA’s evaluation checklist includes ease of adjustment, entry and exit, and casters that work with the floor without letting the chair roll away too easily.⁷

If you have limited reach, grip, or mobility, make those movements part of the buying decision. Check the effort required to operate each lever and whether settings are readable or easy to identify. Find out who will assemble the chair and whether help or an assembly service is available.

For larger or taller users, compare seat depth, usable width, arm spacing, backrest placement, and the stated capacity for the exact model. For shorter users, give particular attention to minimum seat height and whether you can reach the backrest without the seat pressing behind your knees.

A specialized petite or Big & Tall chair may be the better shortlist candidate for its intended user. TKS evaluates how well a chair serves that population; the size label alone earns no credit.

4. Try the seat surface and check your floor

During the trial, pay attention to cushioning, texture, pressure at the seat edge, and how easily you can change position. Record what you notice after real tasks, including how the seat feels later in the day.

CCOHS recommends a stable base, a seat surface suited to the task, and casters appropriate for the floor or chair mat. It also notes that wheel locking can be relevant to the work situation.⁸

Ask which casters come with the chair and whether approved alternatives are available. Include any required floor protection or accessories in your total cost.

5. Set a budget for the whole purchase

Set your spending limit before comparing upgrades. Include delivery, tax, assembly, and any accessories you need. Also check the possible cost of a return.

Use this TKS buying question: What problem does the extra money solve for me? It might buy a more useful fit range, controls you can operate more easily, repairable parts, or stronger support terms. Match that benefit to your needs and the evidence in the review.

For a refurbished chair, ask who performed the refurbishment, which parts were replaced, what condition is promised, and whose warranty applies. Confirm the model and configuration. Keep those answers with the listing and your receipt.

6. Read the return and warranty terms before paying

A warranty describes support for covered problems. A return policy determines whether you can send back a chair that does not suit you. Check both for the exact seller and purchase.

Check clearance, used, refurbished, and marketplace purchases individually. Save the terms that apply when you order. If a key answer is unclear, ask the seller before buying.

7. Use your trial deliberately

Adjust the chair at your actual desk. Begin with seat height and supported feet, then check seat depth, back support, and arm height. Recheck your position at the keyboard; changing one setting can affect the rest. CCOHS describes adjusting the chair and accounting for a fixed-height desk and a footrest where needed.⁹

Try ordinary tasks over several sessions within the return period. Note what works, what you keep readjusting, and what remains uncomfortable. Keep packaging until you know whether you are keeping the chair, subject to the seller’s terms.

HSE recommends changes of activity and opportunities to move or change posture during screen work.¹⁰ Plan those into your routine as well as choosing a chair that supports the way you work.

Your purchase checklist

• I checked the actual seat dimensions and adjustment ranges.
• I checked the stated capacity for the exact model and configuration.
• I can position the chair comfortably at my desk.
• I can reach and operate the controls I need.
• I can enter and leave it comfortably on my floor.
• I know how it will be assembled.
• I know the full purchase cost and the possible cost of a return.
• I confirmed whether an assembled sitting trial is allowed.
• I understand the warranty and who handles support.
• I have a practical way to try the fit and make a decision before the return deadline.

Use TKS reviews to build your shortlist

Our reviews explain fit, support, controls, construction, comfort evidence, warranty, usability, and value. Read the evidence label alongside the score and look closely at who the chair is not for.

The Steelcase Gesture and original COLAMY Atlas currently have Research Preview scores of 86/100 and 76/100. Their assessments are research-based; TKS has not completed physical testing of either chair. Neither has the TKS seal.

Use the Gesture vs. Atlas comparison to inspect their tradeoffs and How We Rate Office Chairs to understand the scoring method. The seal requires at least 90/100, no Disqualifying Fundamental Flaw, and completed TKS physical testing.

The Karim Standard buying principle: Choose the chair whose fit, daily usefulness, evidence, and purchase terms justify its cost for you.

Sources

The sources below support the workstation and chair-fitting guidance. The purchase questions, budget framework, and editorial judgments are TKS’s application of that guidance. Sources checked September 30, 2026.