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How to Adjust Your Seat Height Chair for Optimal Comfort

22 April 2024

What Is the Correct Seat Height and How to Set It Correctly

Making sure your seat height chair is just right is more important than you might think, whether you're clocking in for those long hours at the office or just lounging at home. It's essential for keeping a good posture, staying comfortable all day, and steering clear of all sorts of aches and pains. But what is the ideal seat height and how to set it correctly?

In this guide, we'll detail the optimal height for various types of chairs, explore other ideal dimensions of a chair that contribute to comfort, and walk you through the step-by-step instructions on how to adjust the height of your office chair just right. Join us and adjust your chair to the best possible ergonomic setup!

Why Is the Right Seat Height Important?

The correct chair seat height is a foundational aspect of an ergonomic setup, affecting more than just comfort, but our overall health and productivity. Here's why setting the right seat height is crucial:

1. Promotes Correct Posture: The right seat height helps maintain the natural curve of your spine, promoting a healthy sitting posture. It allows your feet to rest flat on the floor, with your thighs parallel to the ground, reducing the risk of developing postural problems or exacerbating existing ones.

2. Reduces the Risk of Musculoskeletal Disorders: Consistently sitting in a chair with incorrect seat height can lead to musculoskeletal disorders, including lower back pain, neck strain, and tension headaches. Ensuring the seat height is just right can significantly reduce the strain on muscles, tendons, and skeletal systems, thereby preventing potential long-term health issues.

3. Enhances Blood Circulation: A chair of high seat height can restrict blood flow to your legs, while one that is too low can increase pressure under the thighs, impacting circulation. Proper seat height supports healthy blood flow, which is vital for reducing the risk of swelling, numbness, and the feeling of pins and needles in your lower extremities.

4. Improves Focus and Productivity: Comfort and productivity go hand in hand. A chair that's set to the right height reduces muscle strain and fatigue, enabling you to focus better and work more efficiently. Comfortable seating arrangements also encourage longer periods of concentration without the need for frequent breaks due to discomfort.

What Is the Correct Seat Height of a Chair?

The ideal seat height varies depending on individual body measurements and the specific type of chair, but the underlying goal remains the same: to support a posture that promotes health and efficiency. Generally, the correct seat height allows you to sit with your feet flat on the floor, knees at a 90-degree angle, and thighs parallel to the ground.

Here's a closer look at what constitutes the correct seat height for both office and dining table chairs.

Correct Height of an Office Chair

When it comes to office chairs, the goal is to keep you comfortable and your posture in check during those long hours of work. The normal seat height of chairs in the office typically ranges between 40 to 52 centimeters off the floor. This height range accommodates a variety of desk heights and user sizes, allowing you to rest your feet comfortably on the floor without undue pressure on the back of your thighs.

A taller individual may require a chair with a higher seat height to achieve the ideal knee and thigh positioning, whereas shorter users might need lower heights. Adjusta

bility is key in office chairs to allow for personalized settings that match your specific body dimensions and desk setup.

Correct Height of a Dining Table Chair

Dining table chairs are generally non-adjustable, which means selecting the right height is crucial from the start. A seat height chair for a dining table of around 45 centimeters is standard and works well with most dining tables, which are typically 74 to 76 centimeters high. This height ensures you can comfortably sit with your feet on th

e ground and your arms at an appropriate height for eating.

Other Ideal Dimensions of a Chair

While the spotlight often lands on getting the seat height just right, other dimensions of a chair also play significant roles in ensuring you're as comfortable and well-supported as possible. Let's dive into a couple of these essential dimensions:

Seat Width

The width of the chair's seat should provide enough space for you to sit comfortably. Ideally, you should have a bit of wiggle room—about 5 to 10 centimeters on either side of your hips and thighs. This ensures you're not cramped and can adjust your position as needed without bumping into the armrests or sides of the chair. For most adults, a seat width that falls between 40 to 50 centimeters hits the sweet spot, offering ample space for comfort without being too roomy, which can lead to slouching.

Seat Depth

The depth of the chair—measured from the front of the seat to the backrest—should allow you to sit with your back against the backrest while leaving approximately 5 to 10 centimeters between the back of your knees and the seat of the chair. An ideal seat depth is typically between 40 to 48 centimeters. This dimension is critical for supporting your thighs and reducing pressure on the back of your legs, enhancing circulation.

Backrest Height

A chair's backrest should support the natural curve of your spine, providing adequate support to your lower back (lumbar region). For most users, a backrest height ranging from 30 to 48 centimeters from the seat is sufficient to provide adequate support to the lower and mid-back. Chairs with full-back support that extends to the shoulders or head can offer additional comfort, especially for extended periods of sitting.

How to Set the Seat Height of Ergonomic Office Chairs for Enhanced Health and Comfort?

Adjusting your office chair to the perfect seat height is a simple yet effective way to improve your posture, comfort, and overall well-being while working. To illustrate, let's take the FlexiSpot BS10 office chair as an example. This ergonomic chair features a seat height range of 47 to 55 cm, which can be easily adjusted using the lever located below the seat pan.

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Follow these step-by-step instructions to set the ideal height:

1. Start with Your Feet: Sit on the chair and plant your feet flat on the floor. Your feet should be fully supported by the floor or a footrest, not dangling or strained.

2. Check Your Knees: Your knees should form a 90-degree angle, with your thighs parallel to the floor. This position reduces strain on your back and thighs, promoting better circulation.

3. Adjust the Seat Height: If your feet are not flat on the ground or if your knees are not at the correct angle, adjust the seat height. Raise or lower the chair until you achieve the ideal position. Remember, the goal is to maintain your knees at a 90-degree angle and your feet flat on the floor.

4. Align with Your Work Surface: Once you've adjusted the seat height, ensure that your arms can comfortably reach your work surface without your shoulders being elevated or hunched. Your elbows should also form a 90-degree angle when typing or using a mouse. If necessary, adjust the height of your desk or use a keyboard tray to achieve the correct alignment.

5. Fine-Tune Other Chair Settings: After setting the seat height, adjust other components of your chair to enhance comfort further. This includes backrest angle, lumbar support, and armrest height. Each of these elements should support a natural, comfortable posture throughout your entire workday.


The correct seat height chair dimensions are fundamental to maintaining good posture, preventing chronic pain, and ensuring comfort during those prolonged periods of sitting. As we've explored, this involves not only the height of office and dining table chairs but also other dimensions such as seat width and depth. By employing the guidelines provided for setting the seat height of office chairs, you can significantly improve your sitting experience. Remember, the key to ergonomic success lies in customization; what works for one may not work for another. Therefore, take the time to adjust, test, and fine-tune your chair settings to find your perfect fit.