Where Lumbar Support Should Sit, and How It Should Feel
You bought the chair with the lumbar support, you have been sitting in it for a week, and you honestly cannot tell whether it is in the right place or doing anything at all.
Picked on published fit specifications, not on hands-on testing. How we pick.
The short answer
Lumbar support belongs at the deepest point of the inward curve of your lower back, which for most adults sits roughly at belt level - about six to nine inches above the seat. Set correctly it feels like firm, continuous contact you stop noticing. If you can feel a distinct point pressing, it is too high, too firm, or both.
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Ranked picks with published seat height, seat depth and weight capacity
#ad Seat height and capacity are the manufacturer's published figures, sourced under each pick. We do not publish prices — each button opens the current price on the retailer's own page. Seat depth for every pick is in the spec block below. Seat depth summary: Steelcase Leap v2 15.75" · Herman Miller Aeron 16"–18.5" · Sihoo Doro C300 18.11" · Everlasting Comfort Lumbar Support Pillow —
Find your own curve first
Lumbar support is support for one specific thing: the inward curve of your lower back, between the ribs and the pelvis. Everybody has one, nobody has it in quite the same place, and a chair cannot know where yours is.
Sit upright on a hard chair with your feet flat and your lower legs vertical.
Reach behind you and run a hand up your lower back until you feel the deepest point of the inward bend. For most adults this sits roughly at belt level.
Measure from the seat surface to that point. Write the number down. Most people land somewhere between six and nine inches.
That number is what the chair has to match. The full measuring routine, including the four other dimensions that decide fit, is in how to measure yourself for an office chair.
Set the seat before you touch the back
This is the step that gets skipped, and skipping it makes everything after it wrong. Lumbar height is measured from the seat, so if the seat is at the wrong height or the wrong depth, you will set the support to a position you are not actually sitting in.
Seat height first. Feet flat, thighs roughly level. If the chair will not go low enough, add a footrest - get your figure from the seat height table.
Seat depth second. Two fingers of clearance between the front edge of the seat and the back of your calf. A pan that is too long makes you slide forward, and a sitter who has slid forward has no lumbar contact at all regardless of where the pad is - see the seat depth guide.
Then sit all the way back and set the lumbar height to your measured number.
What correct actually feels like
The useful test is not whether you can feel the support. It is whether you stop noticing it:
Firm, continuous contact across the curve of your lower back, with no gap you could slide a hand into.
No single point you are aware of. If you can locate the pad by feel while you work, it is pressing rather than supporting.
You can breathe and rotate normally. Support that stops you turning to reach something is too aggressive.
It gets less noticeable over an hour, not more. Support that becomes more obvious as the day goes on is too firm, and this is the most reliable signal there is.
You are not holding yourself up. If relaxing your back makes you slump away from the support, it is too low or too shallow to be doing the job.
Give any new setting several days. A back that has been unsupported for years will notice almost any support at first, and that initial awareness is not the same thing as the setting being wrong.
The four ways it goes wrong
How a lumbar misfit presents, and what to change
What you feel
Most likely cause
What to change
A distinct point pressing, worse as the day goes on
Support set too high, or too firm for you
Lower it an inch; reduce firmness if the chair has a dial
Ache at the belt line with a gap behind your back
Support set too low, or the backrest is too shallow for your curve
Raise it; if the range runs out, add a strapped cushion
Nothing at all, support feels absent
You are sitting on the front of the seat, usually because the pan is too deep
Fix seat depth first, then re-check the lumbar
Fine upright, wrong as soon as you lean back
Tilt tension set for someone else, so recline moves you off the support
Set tilt tension to your weight; use a lockable tilt position
The third row is the most common of the four by a wide margin, and it is why this page insists on setting the seat first. The fourth is the most overlooked: on a chair whose tension is set for someone heavier, leaning back barely moves the backrest, and on one set for someone lighter you fall through it.
If your chair has no lumbar height adjustment
Most chairs do not, and there are three workable answers:
Move the whole backrest if it adjusts for height. Sihoo publishes 3.5 inches of lift on the Doro C300, which moves the contour to meet you.
Strap a cushion at your measured height. You get a position no chair offers and you set it by hand. The options are in best lumbar support cushions.
Try a rolled towel first. It costs nothing, it takes a minute, and it tells you whether the height you measured is actually the height that helps before you buy anything.
If your symptoms ease when you bend forward or sit, and get worse when you stand or walk, pushing support into your lower back may be the wrong direction entirely. That is the lumbar spinal stenosis pattern: flexion opens the space the nerves pass through and extension closes it, and a firm pad driving your lower back into a deeper curve pushes toward the position that narrows it. Read best office chairs for spinal stenosis instead, and take your direction from your own diagnosis rather than from a general rule.
The opposite pattern - worse with sustained flexion, which is what sitting does - is the one this page is written for, and it is covered further in best office chairs for degenerative disc disease.
What the published guidance actually says
The OSHA computer workstation guidance describes a chair backrest that supports the natural inward curve of the lower back, and emphasizes that the workstation should be adjustable enough to let a worker change position rather than prescribing one posture. Cornell's ergonomics group argues in a similar direction, favoring a reclined working posture over a rigidly upright one.
You will also find very specific claims about exactly which vertebra a lumbar pad should center on. We are not repeating a figure like that, because we have not read a source that establishes it and your own curve is measurable in two minutes - which is better evidence for your chair than any general number. Where we draw that line is in how we pick.
The picks in full
1. Best for Setting place and pressure separately
Steelcase Leap v2
Everything on this page is a two-variable problem - where the support sits and how hard it pushes - and this is the only chair in our registry that gives you a control for each. Steelcase publishes a height-adjustable lumbar plus a separate lower-back firmness dial, which means you can get the height right and then wind the pressure to where it stops being noticeable, rather than accepting whatever force the backrest happens to apply at that height. On any other chair, moving the support also changes how hard it presses. Published seat height 16 to 20.5 inches, 25-inch back, 400 lb rating, 12-year multi-shift warranty.
Who it fits
Anyone who has had support in roughly the right place and still found it uncomfortable.
Who it does not fit
Anyone under about 5 ft 1 in. The 15.75-inch pan is short for a tall sitter wanting full thigh support.
Published specifications
Seat height
16"–20.5"
Seat depth
15.75"
Seat width
19.25"
Back height
25"
Arm height
7"–11"
Weight capacity
400 lb
Lumbar
Height-adjustable lumbar plus a lower-back firmness dial
2. Best for Two different ideas of support, chosen deliberately
Herman Miller Aeron
The Aeron is the clearest illustration of the choice this page is about, because Herman Miller sells it with two different back options and they do different things. The adjustable lumbar pad is conventional support you slide to your curve. PostureFit SL adds a second pad lower down that supports the sacrum, designed to hold the pelvis forward and maintain the lumbar curve from below rather than pressing into it from behind. Neither is better; they feel different and suit different backs. Shell sizing matters too - published seat heights run 14.4 to 19.3 inches in an A against 15.8 to 22.8 in a C - because support lands in the wrong place on a chair that is the wrong size.
Who it fits
Anyone who wants to choose the mechanism rather than inherit it, and anyone whose frame needs shell sizing.
Who it does not fit
Anyone who wants a padded seat. Anyone with the lumbar stenosis pattern, for whom PostureFit SL is the wrong direction - see the stenosis page.
Published specifications
Seat height
14.4"–22.8"
Seat depth
16"–18.5"
Weight capacity
400 lb
Lumbar
PostureFit SL or adjustable lumbar pad, both height-adjustable
Sizes
A (seat height 14.4-19.3 in, seat depth 16 in, warrantied to 300 lb), B (14.8-22.8 in, 17 in, 350 lb), C (15.8-22.8 in, 18.5 in, 400 lb)
Budget chairs almost never have a lumbar pad you can slide, so the cheap version of this adjustment is moving the whole backrest instead - and it works. Sihoo publishes a backrest that lifts through 18.11 to 21.65 inches, which raises or lowers where the molded contour meets your spine, plus a self-adapting dynamic lumbar that flexes with you rather than holding one fixed pressure. Combined with the 18.11-inch pan with depth adjustment, you can set both where the seat ends and where the support lands, which is most of what this page asks for. 330 lb rating, three-year warranty.
Who it fits
Anyone on a budget whose built-in support currently lands too high or too low.
Who it does not fit
Anyone who needs a confirmed seat height before ordering, and anyone wanting to control firmness as well as height.
For an unusual curve this is frequently better than a built-in pad, because you are not limited to the range a designer chose. A contoured memory-foam pad held by two adjustable straps goes exactly where you put it and stays there, which is the whole difference between this and the pillow that came with the chair. It is also the cheapest way to answer the question at the top of this page: if placing support at your own curve by hand makes a clear difference within a week, you know lumbar contact is your issue and you know roughly where it belongs. If it changes nothing, your problem is more likely seat height or seat depth.
Who it fits
Anyone whose chair has no lumbar height adjustment, and anyone whose curve sits outside the chair's range.
Who it does not fit
Anyone with the lumbar stenosis pattern, where pushing a firm pad into the lower back is the direction to avoid. Anyone whose seat is already too shallow.
Published specifications
Lumbar
Fixed-contour memory foam; position set by two adjustable straps
Where should lumbar support be on an office chair?+
At the deepest point of the inward curve of your lower back, which for most adults sits roughly at belt level - about six to nine inches above the seat surface. Measure yours by feel, then set the pad or the backrest to that height with the seat already adjusted.
How should lumbar support feel when it is right?+
Like firm, continuous contact that you stop noticing. If you can locate the pad by feel while you work, or if it becomes more obvious as the day goes on, it is too high or too firm. If relaxing makes you slump away from it, it is too low or too shallow.
Should lumbar support feel uncomfortable at first?+
Noticeable, often. Uncomfortable, no. A back that has been unsupported for years will be aware of almost any support for the first few days. Give a new setting a week. Pain rather than awareness is a signal to lower it or soften it.
Why can I not feel my lumbar support at all?+
Usually because you are sitting on the front third of the seat rather than against the backrest, and the usual reason for that is a seat pan longer than your thigh. Fix seat depth first, sit all the way back, then judge the lumbar.
Is more lumbar support better?+
No. Support that drives your lower back into a deeper curve than it naturally holds is its own problem, and for anyone with the lumbar stenosis pattern it is the wrong direction entirely. The target is contact without pressure, not maximum push.
