"Adjust your chair to a comfortable height" is useless advice. Here are the numbers.
Seat height by body height
| Your height | Seat height (floor to seat top) |
|---|---|
| 5'0" to 5'4" (152 to 163 cm) | 40 to 45 cm |
| 5'4" to 5'8" (163 to 173 cm) | 44 to 49 cm |
| 5'8" to 6'0" (173 to 183 cm) | 47 to 52 cm |
| Above 6'0" (183+ cm) | 50 to 56 cm |
The test: feet flat, knees at 90°, thighs parallel to the floor. If a chair's gas lift range doesn't reach your band, it was built for a different market's anthropometry: check the Minimum/Maximum Seat Height rows in the Specifications section of any of our product pages.
The desk has to follow
Standard Indian office desks run 73 to 75 cm tall, which fits users from roughly 5'7" to 6'0". Shorter than that and the correct fix is raising the chair to keep elbows at 90° on the desk, then adding a footrest to restore the flat-feet rule. Taller users need a 76 to 78 cm desk or a height-adjustable desk.
Then the monitor
Top of the screen at eye level, one arm's length away. If you wear progressive lenses, drop it slightly lower so you read through the top half of the lens without tilting your head back.
Armrests last
Set armrest height so your shoulders hang relaxed, not shrugged, not slumped. Armrest height ranges are listed per chair (typically 18 to 27 cm above the seat). If you use a chair with adjustable arms, set them to just graze your forearms when typing.
Full room-level sequence (lighting, accessories, posture habits) in the workspace setup guide.