Frequently asked questions

Your popliteal height - floor to the underside of your thigh just behind the knee, measured seated with your feet flat - plus about an inch for shoes. That works out at roughly a quarter of your standing height, so about 15.8 in at 5 ft 2 in and 20.3 in at 6 ft 2 in. The full table by height is here, and measuring your own beats any average.

Sit all the way back. If two to three fingers fit flat between the front edge of the seat and the back of your knee, the depth is right. If the edge touches your calf it is too deep - and on almost every chair under $300 seat depth is fixed, so there is no adjustment for it. Your maximum is your buttock-popliteal length minus 2 in of clearance.

Your desk height minus your sitting elbow-rest height. Published data puts that measurement at 7.5 to 11.4 in with a median of 9.5, so a 42 in desk needs a seat around 31 to 34 in. A great many stools sold for standing desks top out below 30. Table for every desk height from 36 to 48 in.

At your standing elbow height, which published data puts between 37.4 in for a 5th-percentile woman and 46.5 in for a 95th-percentile man. That is why 42 in is the figure everyone quotes - it is roughly the middle. If your desk is fixed and wrong, no chair or stool fixes it.

Add a footrest, and do not lower the chair. Set the chair so your forearms are level with the desk, then put your feet on something. Lowering the chair to reach the floor trades a leg problem for a shoulder problem, because a standard 29 in desk is set for roughly a 5 ft 10 in user.

You cannot make a gas cylinder taller, but replacement cylinders in longer lengths are sold separately and fit most chairs with a standard taper. That is not something manufacturers advertise and we have not tried it on any specific model. The other route is a drafting chair, which is simply a task chair on a longer cylinder with a foot ring.

Under an hour of sitting at a time, the stool: lighter, cheaper, tucks away, and a weighted base will not roll out from under you when you are half-seated. Two hours or more, the drafting chair, because the foot ring and backrest are what make that sustainable at height. Full comparison.

They are different tools. A kneeling chair is postural - it holds your spine in a good shape and asks your muscles to keep it there. An office chair is supportive - it accepts the shape you end up in and holds it with material. For a full working day the chair wins; for stretches of forward-leaning work the kneeling chair does. Comparison here.

Both open your hip angle so your lumbar curve holds itself. The difference is where the load goes: a saddle puts it on your sit bones with your feet on the floor, a kneeling chair puts some of it on your shins. If you have knee, shin or ankle problems, the kneeling chair is ruled out. Decision table.

Neither, consistently. Mesh spreads pressure, moves air, and does not change your seat height. Foam conforms, insulates, and adds its full thickness to the seat. Choose on whether you run hot, how long you sit unbroken, and whether your seat height is already correct. Full comparison.

They do the mechanical thing: an unstable base produces continuous small postural adjustments, which is what stops you sitting still. Whether that yields a health outcome over months is a research question we are not equipped to settle, and the claims in most listings go well beyond the mechanism.

Not by design - the pad belongs under your shins, below the kneecap, and the seat should carry most of your weight. Knee pain almost always means the seat is set too low, which slides weight forward onto the pads, or the pad is on the kneecap. Both are setup problems. More here.

Usually that the chair was built around ANSI/BIFMA X5.1, whose tests are based on a 275 lb occupant, with the figure rounded up. Unless a listing names a standard, treat the number as the manufacturer own claim rather than a tested result. What each standard tests.

X5.1 is the general-purpose office-chair standard, tested around a 275 lb occupant. X5.11 is the large-occupant standard covering 253 to 400 lb, with most loads raised - 400 lb rather than 250 on the swivel and caster tests - and it is the only standard that specifies a minimum seat width.

At least 20 percent, so a chair suits a user up to about 80 percent of its rating. Ratings are static figures and real use is not: dropping into a seat or leaning back hard loads a chair well above your body weight for a moment.

Because the marketing copy is written to sound complete rather than to be checkable, and a seat-height range invites you to check it. It is the most common gap we find. Where a product does not publish the figure a page turns on, we exclude it and say so rather than estimating - which is how two otherwise-interesting stools ended up on an excluded list.

No. Units we claim to have tested: 0. Every figure here is read from the manufacturer own published specification with the source linked, and every fit figure is computed from a cited anthropometric table with the arithmetic shown. The full list of what that method cannot assess - all-day comfort, foam breakdown, build quality, noise - is published rather than buried.

Because you can check them. The rubric is published, the per-criterion scores are on every pick, the anthropometric source is named, and every product specification links to the listing it came from. That is a different kind of authority from a test lab, and where hands-on findings are what decide your purchase we will point you at publishers who own the units.

Six criteria, each computable from published documentation, each scored relative to the best published figure in that page field. The overall is their mean, rounded to one decimal place. Every pick shows the per-criterion breakdown, and the weighting is stated on each page. The rubric.

Because there is no live price for it right now. Every figure comes from a lookup against the retailer and expires after 48 hours, at which point the page shows "check price" instead of a number. We never display a remembered or estimated price. Prices were last verified September 30, 2026.

Yes - a commission on qualifying purchases through the Amazon Associates Program, at no extra cost to you. We hold no inventory, sell nothing, accept no sponsored placements and accept no free products. Commission rates do not affect the ranking; where a cheaper option is better for you it is the higher pick. Full disclosure.

Because this site launched in 2026 and has no customer base. A clean page with no testimonials is the correct state; inventing them would be the fastest way to deserve nothing. We also never emit our own editorial score as a product rating in structured data, because we do not run a test lab.

No, and we will not pretend to. There is no clinician on this site and nothing here is medically reviewed. We describe what a seat does mechanically - pelvic tilt, seat-pan pressure, published lumbar travel - and stop there. Persistent or worsening pain, numbness or weakness is a reason to see a clinician.

Tell us and we check it against the manufacturer published source. If it is wrong we fix it and date the correction visibly on the page; if it changes a score we re-rank and say the order changed. Contact us - a site whose claim is check-our-arithmetic does not get to be precious about being checked.