How To Set Up An Ergonomic Desk
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Start with elbow height, not chair height
The four big numbers to get right are: desk height, chair height, monitor height, and monitor distance. Get these inside the OSHA / BIFMA G1 ranges and 80% of common pain patterns — sore neck, tight shoulders, lower back ache, wrist tingles, late-day headache — either disappear or become much easier to manage with the rest of your lifestyle.
The 90-90-90 chair rule
Sit relaxed with your forearms parallel to the floor. The desk surface should hit at your elbow height. Most office desks ship at 28–30 inches off the floor, which is too tall for anyone under about 5’9″. If you can’t lower the desk, raise the chair until elbows meet the desk — then add a footrest so your thighs stay parallel to the floor and your feet stay flat.
Monitor: top edge at eye line
If your chair has lumbar support, it should hit the small of your back — not your mid-back, not your tailbone. If it doesn’t, roll a small towel and put it there. Free, works, takes 30 seconds.
Keyboard and mouse
The classic mistake is monitor too low — almost everyone using a laptop on a desk has this problem. Looking down at a screen for 6–8 hours a day grinds the cervical spine and locks up the upper traps. Stack books, buy a $20 monitor riser, or use a laptop stand with an external keyboard. Monitor top should sit at or just below your eye line when you’re sitting tall.
Lighting and screen
Distance: roughly an arm’s reach — 20–30 inches for most people. Closer strains accommodation; farther forces you to lean. Bigger displays move farther back; smaller move closer. The text should be readable at 100% zoom without squinting.
The cheap upgrade priority list
Match screen brightness to room brightness. A bright screen in a dim room is the most common eye strain trigger besides bad geometry. Position the desk so windows are 90° to your monitor — not behind you (glare) and not behind the monitor (silhouette). For evening work, warm/dim ambient lighting plus a cooler task lamp on the keyboard works better than dim everything.