My Chair Won't Go Low Enough

You drop the lever and the seat stops. Your feet are still not flat on the floor, or they are flat but your thighs are being pressed into the front edge of the seat. The chair is bottomed out, and no amount of adjusting will take it lower.

This page is about that specific dead end, because the usual advice — "get a footrest" — solves only half of it, and it is worth knowing which half you are dealing with before you buy anything.

First: is it the chair, or is it really the desk?

Two measurements, one minute.

1. Your popliteal height. Sit upright with knees at 90 degrees and measure from the floor to the underside of your thigh, just behind the knee. Across adult populations this lands near 25% of your standing height — measured directly on 6,068 people it comes out at 24.3%, and the full distribution is published here.
2. Your chair's lowest seat height. Push the lever all the way down, then measure from the floor to the top of the seat cushion at its compressed state.

Now compare against the desk. If your desk is at the right height for you — about 40% of your height — and the chair still cannot reach your popliteal height, you have a genuine chair problem and the fixes are below.

If the desk is also too high, you have a desk problem wearing a chair's clothes. Raising the seat to reach a tall desk and dangling your feet is not a solution, it is two problems stacked. In that case the order is: fix the desk first, then the chair follows. My desk is too high and I can't adjust it covers that case.

Why a footrest only fixes half of it

A footrest raises the floor. That is genuinely all it does.

It fixes: dangling feet, pressure behind the knees, the forward slide that happens when your legs have nothing to push against.

It does not fix: the distance between the desktop and your elbows. If your seat is stuck 5 cm too high, your elbows are 5 cm too high relative to the desk, which means your shoulders are working to hold your arms down all day, or you are hunching to meet the keyboard. No footrest changes that number, because the number is desk-minus-seat and the footrest touches neither.

So the rule is:

• Feet dangle, elbows fine → footrest. Done, cheap.
• Feet dangle, shoulders ache → the seat has to come down. Footrest is a comfort add-on, not the fix.

The four fixes, ranked by what they actually correct

1. Swap the gas cylinder for a shorter one

Best for: a chair you otherwise like, with a gap of roughly 3–8 cm.

The seat height range is set by the gas cylinder inside the column, not by the chair's design. Most task chairs use a standard-size cylinder and replacements are sold in several stroke lengths; the swap is usually a matter of tapping the old one out of the base and dropping the new one in. Look for the length stamped on the side of your existing cylinder and buy one that is shorter by the size of your gap.

Caveats that matter:

• Check the cylinder's class rating matches or exceeds the original (they are rated 2 through 4). A weaker cylinder in a chair used heavily will sag.
• Very short cylinders can put the seat close enough to the base that the column bottoms out internally, which feels like a hard thud when you sit. Leave 1–2 cm of margin.
• This usually voids any warranty on the chair.

2. Replace the casters with fixed glides

Best for: gaps of 2–5 cm on a chair that will never need to roll.

Casters sit between the base and the floor, and they are taller than the fixed glides many chairs ship with as an option. Swapping them drops the whole chair by roughly the height of the caster assembly — commonly 2–5 cm depending on the wheel size.

The obvious trade: the chair stops rolling. That is fine at a desk you never move away from and unacceptable if you roll between two workstations.

3. Buy a chair with a genuinely low seat range

Best for: gaps over 8 cm, or anyone under about 5'4".

Most general-purpose office chairs are built around a 5'6"–6'2" user and their seat range reflects it. Chairs marketed for smaller users — "petite", "small", or compact task chairs — typically start several centimetres lower. The number to look for in the specification is the minimum seat height, not the range. A chair listed as "16–21 inches" starts at 40.6 cm, which still will not fit someone whose popliteal height is 38 cm.

Seat depth matters just as much and is more often the real complaint. A seat that is too deep forces you forward off the backrest regardless of height, so a chair that goes low enough but is 5 cm too deep will still feel wrong. If you can, sit in it before buying.

4. A drafting chair with a footring

Best for: a desk or bench that is genuinely high and cannot be changed.

This is the honest answer when the surface really is above your elbows and you cannot lower it. Instead of forcing the chair down and losing the desk relationship, you accept the height and put a ring under your feet. It is standard practice for standing-height benches and drafting tables for exactly this reason.

The catch is that a tall seat with a ring puts more of your weight on your feet and less on the seat, so it is a setup for alternating, not for eight hours.

What a too-high seat actually does to you

Worth knowing, because it explains why this is not just a comfort issue:

• Behind the knees. The seat edge presses into the soft tissue where blood vessels and nerves run close to the surface. Numbness or tingling in the feet and calves is the usual report.
• The pelvis. Pressure under the thighs makes most people rotate the pelvis backward to get relief. That flattens the natural curve of the lower back and moves the load onto passive structures — which is why a chair that is too high is a common hidden cause of lower back pain. More on that in desk setup for lower back pain.
• The slide. With nothing under your feet you drift forward onto the front of the seat to stabilise yourself, which abandons the backrest entirely.

If you have numbness, tingling, or pain radiating down a leg rather than simple fatigue, that is worth having looked at by a clinician rather than solved with furniture.

FAQ

Why won't my chair go lower?

Because the gas cylinder has reached the bottom of its stroke. It is a physical limit of the part, not something you can adjust past — the only ways down are a shorter cylinder, lower feet, or a different chair.

Is a footrest enough?

If your elbows are already comfortable at the desk, yes. If your shoulders are working or you are hunching to reach the keyboard, no — the seat itself has to come down, and a footrest will not do that.

Can I just raise my desk instead?

You can, and if your desk is adjustable that is often the easier move, because the desk is the number everything else follows. But raising the desk raises the keyboard surface relative to your elbows, so check that first. If the desk is already at about 40% of your height, do not raise it to accommodate the chair — fix the chair.

Are there chairs made for short people?

There are chairs with lower seat ranges and shallower seat pans, usually listed as compact, petite, or small-user models. Check the stated minimum seat height against your popliteal height rather than trusting the label.

My chair goes low enough but my knees hit the desk. What now?

That is a knee-clearance problem, not a height problem — usually a drawer unit or a modesty panel under the desktop. Clear the space under the desk or raise the surface; see desk too high and can't adjust it.

Related

• What height should your chair be? — the 25%-of-height rule and why the chair follows the desk.
• My desk is too high and I can't adjust it — the other half of the same problem.
• Desk height for short people — why standard furniture misses shorter bodies.
• How to sit at a desk correctly — the four sitting patterns and what each one needs.
• Which of the five numbers is wrong? — a symptom-to-cause chart if you are not sure what is actually hurting.
• Desk and monitor height calculator — your five numbers from your height.