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A summary of ergonomic chair guidelines

The age of universal ergonomic seating is upon us. Excessive screen-based sedentary time is the norm. Sitting full-time in conventional office chairs causes health issues. Ergonomic seating mitigates those issues. Although there are no universal ergonomic seating standards, there is a consensus. ChairsFX defines ergonomic seating standards for the modern era.

Ergonomic seating guidelines
Enough data exists to define essential ergonomic features for computing chairs.

Human physiology is complex. There is still no universal standard that defines healthy ergonomic sitting. Even so, gaming chair popularity is at an all-time high. The key reasons are ergonomic. Gaming chairs support good posture, comfort, and movement over long periods of sitting.

While gaming chairs serve the needs of modern computer users, office chairs do not. That’s why the multi-billion-dollar office chair industry is making a major transition towards healthy ergonomic seating.

Traditional office chair limitations

In the modern computing era, Americans are sitting more than ever. For instance, the average desk worker now sits around ten hours each day.

Under these conditions, traditional office chairs are falling out of fashion. These models lack adjustability. They have fixed backrests, fixed armrests, and adjustable seat height. They also come with rocking and tilt-tension function.

Common office chair features
These crude features are not enough to support the needs of full-time desk workers.

For full-time desk workers, these crude features are neither safe nor healthy. Back pain in America costs over $12 billion per year. Employees at American companies take around 83 million sick days each year because of back pain.

Depressed office worker
Back pain caused by poor sitting habits is a major problem in America.

In recent years, the multi-billion-dollar office chair industry has shown signs of adapting to new ergonomic realities. That’s why most analysts predict massive demand for ergonomic furniture as a key driver of industry growth.

A few office chairs with enhanced ergonomic features have already surfaced. In the coming months, expect to see a flood of ‘ergonomic’ chairs on the market.

Cheap ergonomic office chair reviews
Some of the first wave of low-cost ergonomic office chairs for consumers.

As new ergonomic products emerge, there remains no universal consensus about what features define an ergonomic chair. Luckily, industry-defining studies do exist. Below, we summarize two leading bodies of data to help define clear standards for ergonomic seating.

Leading ergonomic chair guidelines

There is no universal standard that defines healthy sitting ergonomics. Luckily, most modern schools of thought on the subject share the same ideas. Below is a summary of standards from three leading ergonomic science sources.

BIFMA ergonomic guidelines

The Business and Institutional Furniture Manufacturers Association (BIFMA) was founded in 1973. It serves North American furniture manufacturers by providing furniture safety standards. Manufacturers can then test their products to determine if they meet BIFMA standards.

BIFMA chair testing procedure
An ergonomic chair undergoing BIFMA usability tests.

In 2002, the BIFMA organization released an ergonomic guidelines for office furniture. In 2013, ergonomic guidelines were updated. Key points (summarized by AllSteel):

  1. Height of seat: should allow the user’s feet to plant onto the floor or a footrest.
  2. Depth of seat: should be deep enough so that the back of the knees do not touch the front of the seat.
  3. Seat width: should be wide enough to accommodate the user’s hips.
  4. Backrest: should conform to the shape of the user’s spine. It should also have lumbar support that maintains the lordotic curvature of the lumbar spine.
  5. Armrests: should be adjustable up and down, plus in and out. This helps to relieve neck, shoulder, and back stress.

BIFMA also recommends that an ergonomic chair provide a healthy range of motion. The seat and backrest should allow varied postures. The backrest should recline from 90° to at least 115°. The only guideline for seat tilt is to ensure the torso-to-thigh angle is not less than 90°.

Handbook of Human Factors and Ergonomics

The fourth edition of the Handbook of Human Factors and Ergonomics came out in 2012. It is a key reference book for ergonomics researchers, practitioners, and graduate students. Each chapter has a strong theory and scientific base, but with a focus on real-world applications.

Human factors and ergonomics book cover

Its statement on ergonomic seating:

The purpose of good seating is to provide stable body support and a dynamic posture. It should be comfortable over long periods and physiologically sound. It should also be appropriate to the task being performed.

The handbook defines an ergonomic workstation. It should allow the operator to sit with good posture. They should be able to see the screen without moving their head. The keyboard, mouse, or document they are working on should be easy to reach with minimal effort.

Ideally, the perfect workstation would have a height-adjustable screen, keyboard and chair. Below are key requirements:

Ergonomic chair essential features

The Handbook cites five key features that all ergonomic chairs should have:

  1. Chair adjustment controls should be easy to operate from a seated position.
  2. The chair and adjustment mechanisms should be rugged.
  3. Chairs should have adjustable armrests.
  4. The seat should be padded to ensure comfort.
  5. The chair should allow alterations in posture and freedom of movement.

Ergonomic functionality requirements

The handbook also adds brief standards that ergonomic seating should meet:

  • Seat Height: should be adjustable by the user so that the feet rest flat on the floor. If the operator is too short to rest feet on the floor, they should use a footrest.
  • Seat depth: the seat should be deep enough so the user can sit far enough back to use the backrest without putting pressure on the knees.

Ergonomic chair seat depth standards
You need a deep enough seat to sit against the backrest without placing pressure on the inside of the knees.

  • Backrest height: the backrest provides back support in various postures. For full support, the top of the backrest should be at least 18” higher than the compressed seat height.
  • Lumbar support: this helps to maintain the natural curvature of the lower spine. The lumbar support area of the backrest should be between 6” to 10” above the compressed seat height.

Lordotic sitting in an ergonomic chair
The backrest should be high enough to support the entire back. Lumbar support should should induce mild lordosis.

  • Backrest angle: studies have shown that recline angles reduce fatigue. If adjustable, a backrest should recline to at least 115◦.
  • Armrest height: armrests at the right height support the neck and shoulders. Armrests should be height adjustable with a range of at least 4″.

Backrest recline and adjustable armrests
A supportive reclining backrest plus adjustable armrests are essential ergonomic features.

Cornell Ergonomic Guidelines

Dr. Alan Hedge is a Professor in the Department of Design and Environmental Analysis at Cornell University. His 2013 paper on ergonomic seating compiled the findings of several leading studies.

Sitting with lumbar lordosis is ideal

A key point in his paper is that healthy sitting requires a pelvic rotation that creates lumbar lordosis. When the angle between the thighs and the body is too small, the lumbar curve flattens or bends outward. That is called lumbar kyphosis. Kyphosis occurs because of the restrained rotation of the hip joint. That forces the pelvis to rotate backward, placing pressure on the spinal discs.

Kyphosis vs lordosis
Sitting with a slouch causes kyphosis. Sitting with lumbar support induces mild lordosis.

The trick to inducing lumbar lordosis is to use lumbar support. Another method to reverse kyphosis is to use a reclining backrest.

Ergonomic sitting realities

There are five key findings that lead to ergonomic chair recommendations:

  1. Proper sitting requires a pelvic rotation that creates lumbar lordosis.
  2. Lumbar, thoracic, and cervical muscle activity decreases with a backrest incline to 110°.
  3. Lumbar disc pressure and back muscle activity are lowest with a supported recline angle of 110° – 130°.
  4. A high proportion of chair users make height adjustments to their lumbar support.
  5. After 1 hour, there is spinal shrinkage with static sitting. In contrast, the spine expands with dynamic sitting where the seat pan swivels.

Breaks for movement are essential

Beyond Dr. Hedge’s suggestions, ergo.human.cornell.edu adds these recommendations:

Every 20 minutes, stand for eight minutes — while moving for at least two minutes. The absolute time isn’t critical — use these as rough guidelines. The important thing is to take a posture break to stand and move for a few minutes. Only standing is insufficient. You need movement to get blood circulation through the muscles.

To learn more about the importance of movement, ChairsFX spoke with esports physical therapist Dr. Joshua Lee.

Dr. Joshua Lee demonstrates simple wrist exercises
Dr. Lee suggests taking short exercise breaks between computing sessions.

His advice for gamers: “The body craves movement. Short rest breaks with exercises are like little snacks. Your body can use these throughout the gaming session to keep you energized.”

Dr. Lee’s healthy sitting advice for gamers

Condensed guidelines

Most contemporary ergonomic chair guidelines share the same broad standards. An ergonomic chair should be comfortable, adjustable, and good for your back.

For detailed guidelines, we started with BIFMA ergonomic standards. Then we took standards from the Handbook of Human Factors and Ergonomics. Over those core principles, we layered concepts from Cornell U and Dr. Alan Hedge. All standards are consistent, with no contradicting ideas.

Condensing the gist from all three research sources gives us clear ergonomic chair guidelines. Use these to assess the chairs you’re thinking of buying.

Broadly, your ergonomic chair should support a healthy sitting posture. It should also provide consistent comfort — whether sitting or standing. How you feel when getting up from the chair is as important as how you feel while sitting.

But a chair’s comfort is subjective. It depends on the type of work you do, your physical proportions, and your sitting style. In his defining paper, Dr. Hedge notes that it’s not possible to assess the comfort of a chair by sitting in it briefly. In this writer’s experience, it takes at least a week of full-time use to determine how comfortable a chair is — for your needs.

To ensure the most comfortable outcome, look for these essentials when shopping for an ergonomic chair:

Lumbar and back support

Sitting with a curve in your lower back is the ideal. Office chairs fail because they don’t offer customized back support. People have different torso lengths and lumbar curves.

Gaming chair back support
Look for a chair that provides adjustable support for your lower back.

To ensure a healthy lumbar curve while sitting, adjustable lumbar support is essential. Further, the backrest should be tall enough to support your back, neck, and upper body muscles.

Reclining backrest

The point of an ergonomic chair is to reduce pressure on your back. With a backrest recline of 110°, lumbar, thoracic, and cervical muscle activity decreases.

Gaming chair versus office chair recline
Office chairs have fixed back angles; gaming chairs can recline at various angles.

With supported recline between 110° and 130°, back muscle activity is the lowest.

Adjustable armrests

A human arm weighs around 6% of total body weight. A 170-pound person’s arms weigh around 10 pounds each. Without armrest support, your spine bears the load of holding your arms up against gravity. When computing, that places unnecessary strain on the spine, shoulders and neck.

Sitting up straight in a gaming chair
Adjustable armrests relieve the spine by absorbing the weight of both arms.

In contrast, adjustable armrests discourage slouching while also promoting a neutral sitting posture.

Appropriate chair size

Pricier ergonomic chairs come with a height-adjustable backrest and sliding seat. Those features allow a perfect fit for various sizes. To ensure that lumbar support hits the spot, shorter users can lower the backrest. In a similar fashion, larger users can extend the seat depth for a better fit.

Choosing the right size ergonomic chair
Choosing the right sized chair will ensure optimal ergonomic support.

However, many ergonomic chairs do not come with these features. If you can’t adjust backrest height or seat depth, choosing a proper-sized chair is crucial.

Key dimensions to look for:

  1. Seat width and depth
  2. Backrest width and height
  3. Floor to seat range

Larger users should make sure that the seat and backrest width fits their proportions. Smaller users should select a backrest appropriate for their body size. To learn more, check out our detailed sizing guide:

Gaming chair sizing guide

Getting the best value for money

Beyond ergonomic features, it’s also important to ensure good value for money. On one hand, you should try to avoid paying more than you need to. On the other hand, cutting corners can result in a poor chair investment. Keep these aspects in mind when assessing the value of a chair:

  • Durability: ergonomic chairs have many complex parts. Many minor things can go wrong, like cracked knobs or broken parts. Cheaper chairs are notorious for making squeaks and weird noises when you move. Many cheap chairs also don’t hold up well under full-time use. Faux leathers can crack, while cheap seat padding can flatten.
  • Price: there is a major difference in quality between a $60 office chair and a $900 ergonomic chair. Cheap chairs use lower-grade plastics and metals. They also have less adjustable features than pricier models. Paying more gets you improved ergonomic features and better quality upholstery.
  • Warranty: typical office chairs usually come with a 30-day warranty. Cheap gaming chairs come with 1-2 year warranties. Some high-end gaming chair brands offer 5-year warranties. At the top, the priciest Herman Miller chairs come with rock-solid 12-year warranties.

Learn more on this topic in our analysis of gaming chair price range qualities:

Difference between cheap vs expensive gaming chairs

Conclusion

Ergonomics seating is the way of the future, and the future is here. Ergonomic gaming chairs are more popular than ever. The multi-billion-dollar office chair industry is currently transitioning towards ergonomic designs for computer users. Herman Miller designers are also hard at work on a revolutionary new gaming chair design.

For those unfamiliar with ergonomic seating, it’s easy to get lost in the complexity. Then, it’s likely that you end up with an ergonomic chair ill-suited to your needs.

To avoid that, use the ergonomic principles in this guide to assess potential chairs. Follow these super-simplified guidelines:

  1. An ergonomic chair should have adjustable lumbar support and height-adjustable armrests.
  2. The backrest should let you lock the recline with a range of 90° to 130°.
  3. If planning to use your chair full-time, look for a warranty of at least two years.

If you need more help, two features break down seating ergonomics from two perspectives:

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