Choosing an ergonomic office chair with a footrest starts with the chair’s adjustability, and the footrest is only needed if your feet can’t rest flat.
Most people shop for a footrest first and get the chair second. That gets the sequence backwards. The chair is the foundation of office ergonomics, and the footrest is a support tool that only earns its place when your feet genuinely can’t reach the floor. The right way to pick both pieces, and the order that actually works, is simpler than most product listings suggest.
Start With the Chair: Four Adjustments That Matter Most
Before a footrest enters the picture, the chair itself has to fit your body. Mayo Clinic’s office ergonomics guidance is clear on the goal: your thighs should sit roughly parallel to the floor, your knees bent around 90 degrees, and your feet flat on the floor. Four adjustments get you there.
Seat height is the starting point. Set it so your feet rest flat and your knees sit level with or slightly below your hips. Lumbar support should match the natural curve of your lower back — a fixed pad that hits the wrong spot is worse than none. Armrests should let your shoulders relax while your forearms rest parallel to the floor. Seat depth matters too: you want a couple of fingers of space between the back of your knees and the seat edge.
If you can hit all four of those adjustments and your feet stay flat, you’re done. The footrest is optional.
When Does a Footrest Actually Become Necessary?
A footrest earns its place in one specific situation: when the desk height forces your chair higher than ideal, leaving your feet unsupported. Simon Fraser University’s office ergonomics purchasing guide names this exact scenario — the chair gets raised to reach the work surface, and suddenly your feet are dangling.
Clark County’s Environmental Health and Safety office frames it even more directly: footrests are a last resort for when the chair cannot be lowered enough. If your chair is properly adjusted and your feet still don’t reach the floor, or the desk height forces the chair up, that’s your cue.
What a footrest is not: a fix for a poorly fitted chair, a way to skip proper seat adjustment, or a substitute for getting the chair itself right. Buying a footrest before setting chair height is the most common mistake in this entire process.
What to Look for in a Footrest
When the footrest is genuinely needed, three features separate a useful one from a hazard. SFU’s guide lists them directly: adjustability, a non-skid surface, and enough size for freedom of movement.
- Height adjustability. This is non-negotiable. Your thighs need to stay parallel to the floor, and Clark County’s guidance allows for roughly 1–3 inches of variance. A fixed-height footrest can’t deliver that.
- Non-skid surface and stable base. Your feet should stay put, and the footrest itself shouldn’t slide when you shift weight. Stability prevents the small slips that break your posture.
- Enough size to move. A footrest that’s too small locks your feet in one position. You want room to shift your feet and move your ankles through their full range — SFU specifically recommends a 90-degree angle at the ankle.
The chair-and-footrest combination should never create pressure behind your knees. If the seat edge digs in when your feet are on the rest, the setup is wrong. And no matter how good the gear is, staying in one static posture for hours is its own problem — shift positions regularly throughout the day.
| Component | What to Check | Why It Matters |
|---|---|---|
| Chair seat height | Feet flat, knees at or below hips | Base of the whole setup |
| Lumbar support | Matches your lower back curve | Prevents slouching and back strain |
| Armrests | Shoulders relaxed, forearms level | Reduces neck and shoulder tension |
| Seat depth | Fingers of space behind knees | Avoids pressure behind the knees |
| Footrest height | Thighs parallel to floor | Only needed when feet don’t reach |
| Footrest base | Non-skid, stable, no slipping | Prevents posture-breaking shifts |
| Footrest size | Room to move feet and ankles | Allows natural movement and shifts |
Setting Up the Pair the Right Way
The order is the whole trick. Start with the chair alone. Adjust the seat height until your thighs run parallel to the floor and your knees sit near 90 degrees. Mayo Clinic’s office ergonomics guidance backs this sequence: set the chair first, then check whether your feet reach. If they don’t, bring in the footrest and adjust it until your thighs return to parallel.
When both pieces are working together, your feet should rest fully on the footrest with your knees at a comfortable angle, and your thighs should hold that parallel line without you forcing anything. There’s a difference between the setup working and you working to hold the setup — the latter means something’s off.
If you’re looking for a chair that makes this whole setup easier, our tested roundup of ergonomic office chairs with footrests covers models that handle the adjustability well.
FAQs
Should I buy a footrest at the same time as a new chair?
No. Set up the new chair first and check whether your feet rest flat on the floor at the correct seat height. Many people discover a properly adjusted chair makes a footrest unnecessary. Buy the footrest separately, after the chair is dialed in, if your feet still don’t reach.
Can a footrest fix a chair that’s too tall for me?
Yes, but only when the chair can’t be lowered further or the desk height requires the chair to stay up. In that case a footrest is the right call. A footrest is not a substitute for a chair that fits — it’s a support for when the work surface forces a compromise.
Is it bad to have my feet hanging while I work?
Yes. Unsupported feet put pressure behind your knees, strain your lower back, and pull you out of the neutral posture that office ergonomics aims for. If your feet can’t reach the floor after adjusting your chair, a stable, adjustable footrest is the fix.
References & Sources
- Mayo Clinic. “Office Ergonomics: Your Guide to Setting Up a Desk That Works.” Explains the chair-height and footrest guidance for proper seated posture.
- Simon Fraser University. “Office Ergonomics Purchasing Guide.” Details when footrests are necessary and the features they need.
- Clark College. “Footrest Guidance.” Frames footrests as a last resort and sets the thigh-parallel standard.