If your back aches after a few hours at your desk, your chair might be the culprit—but before you start shopping for a new one, you should know that most office chairs have adjustment features that go largely unused. Even a high-quality ergonomic chair won’t help your back if it’s not properly fitted to your body. The good news? A few simple tweaks can transform your seating situation and make those long workdays much more comfortable.
Start with the foundation: seat height. This is often the most noticeable issue and the easiest fix. When you’re seated with your feet flat on the floor, your knees should form a 90-degree angle, with your thighs parallel to the ground. If your knees are higher than your hips, you’re putting unnecessary pressure on your lower back and restricting blood flow to your legs.
Most office chairs have a pneumatic lever under the right side of the seat. While seated, lift the lever and let your weight adjust the height downward, or stand slightly to raise it. Your feet should rest comfortably on the floor without dangling, and there should be a two-finger gap between the front edge of the seat and the back of your knees. If you’re on the shorter side and your feet don’t quite reach the floor even at the lowest setting, a footrest (which typically runs $20-40) can make a significant difference.
Your lower back has a natural inward curve, and proper lumbar support maintains this curve rather than flattening it out. Many people experience back pain simply because they’re not using their chair’s lumbar support correctly—or at all.
If your chair has adjustable lumbar support (common on chairs in the $200+ range), you’ll usually find a knob or lever at the lower back of the chair. Adjust it so the support sits in the curve of your lower back, typically just above your belt line. The support should feel present but not like it’s pushing you forward out of the seat. Some chairs offer both height and depth adjustments for lumbar support, giving you even more control.
For chairs without built-in lumbar support, a separate lumbar cushion ($25-60) can work wonders. Position it at your lower back, and make sure you’re sitting all the way back in the chair rather than perching on the edge.
Armrests often get overlooked, but they play a crucial role in preventing shoulder and upper back tension. Your armrests should allow your shoulders to relax in a natural position—not hunched up or reaching down. When your arms rest on them, your elbows should sit at roughly 90 degrees with your forearms parallel to the floor.
Most mid-range chairs ($150-400) offer height-adjustable armrests, while higher-end models ($400+) may include width and angle adjustments too. If your armrests are too high and you can’t lower them enough, it’s actually better to work without them than to force your shoulders into an uncomfortable position.
For backrest angle, a slight recline of 100-110 degrees reduces pressure on your spine compared to sitting bolt upright. Many chairs have a tension knob under the seat that controls how easily the chair reclines—tighten it if you feel like you’re going to tip backward, or loosen it if reclining takes too much effort. The recline lock feature lets you secure your preferred angle.
If your chair offers seat depth adjustment (more common on ergonomic models $300+), you’ll find a lever under the front of the seat. Proper depth means you can sit with your back against the backrest while maintaining that two-to-three-finger gap between the seat edge and the back of your knees. Too deep, and you’ll either perch forward or compress the backs of your knees; too shallow, and you won’t have adequate thigh support.
Take time to test your adjustments throughout the day. Your body will tell you what’s working—you should feel supported without any pressure points, and you should be able to maintain good posture without conscious effort.
Getting your office chair properly adjusted is genuinely worth the 10-15 minutes it takes. If you’ve made all these adjustments and still experience persistent back pain, that’s when it might be time to consider whether your chair has the features you actually need. But start with what you have—you might be surprised how much better you feel with just a few simple changes.
