President Chair and Office Chair Dimensions
Reasonable dimensions for president chairs (office chairs) are typically designed based on ergonomics, as follows:
Seat height: This refers to the vertical height from the bottom of the office chair cushion to the ground, with a common range of 40 - 45 centimeters. This height design allows the seated person's thighs to be approximately horizontal, the calves to be naturally vertical, and the soles of the feet to lie flat on the ground, meeting the mechanical requirements of the human body's natural sitting posture. Some also believe that the seat height can be adjusted between 35 - 45 centimeters, depending on an individual's height, body type, and the height of the office desk. For example, taller individuals may need a seat height of around 45 centimeters to avoid leg suspension, while shorter individuals can choose a seat height of 35 - 40 centimeters for comfort.
Seat width: This refers to the distance between the left and right sides of the cushion, usually 45 - 50 centimeters. This width can accommodate the buttocks of most people and leave some room for movement, preventing discomfort or prolonged pressure on the buttock muscles due to insufficient seat width. For users with wider body types or those who need to frequently adjust their sitting posture, it is recommended to choose a seat width close to 50 centimeters for enhanced comfort.
Seat depth: This refers to the maximum horizontal distance between the front and back of the cushion, generally 40 - 45 centimeters. Appropriate seat depth ensures comprehensive support for the thighs, preventing thigh suspension due to short seat depth or pressure on the blood vessels and nerves behind the knees due to long seat depth. For example, users around 170 centimeters tall usually find a seat depth of 40 - 42 centimeters suitable, while those over 180 centimeters tall may need a seat depth of 43 - 45 centimeters.
Back height: This refers to the vertical height from the top edge of the backrest to the upper surface of the cushion, which should be no less than 63 centimeters. This height can provide support above the shoulders, effectively protecting the spine and neck, and preventing head forward tilt or spinal curvature due to a low backrest. Some also believe that a backrest height of around 41 - 42 centimeters and a backrest width of around 40 - 42 centimeters can provide sufficient back support, but such designs may be more suitable for short-term use or scenarios with lower back support requirements.
Armrest height: This refers to the vertical height from the top of the armrest to the upper surface of the cushion, generally between 20 - 25 centimeters. Appropriate armrest height allows the arms to rest naturally, reducing pressure on the shoulders and neck, and preventing arm suspension or body forward tilt due to armrests that are too high or too low. For example, when using a keyboard and mouse frequently during office work, it is recommended to choose an armrest height of 22 - 25 centimeters to keep the arms parallel to the desk surface.
