You have the band of ache across your lower back and a line of pain running down one leg, and the advice for the first one keeps making the second one worse.
Picked on published fit specifications, not on hands-on testing. How we pick.
The short answer
The Steelcase Leap v2 is the pick, but the order of operations changes when both are present: seat depth and pressure under the thigh come before lumbar support, because the sciatic pattern is aggravated by the front edge of the seat in a way that plain lower back pain is not.
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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 We do not publish prices — each button opens the current price on the retailer's own page.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" · Steelcase Series 1 15.5"–17.75" · Herman Miller Aeron 16"–18.5" · ComfiLife Premium Comfort Seat Cushion —
Why having both changes the order of operations
A sore lower back and a sciatic leg want different things from a chair, and that is the whole reason this page exists separately from the two single-symptom pages.
Plain desk-related lower back ache usually responds to restoring the lumbar curve: support behind the small of the back, a pelvis held upright, feet loaded. The standard advice is more support, placed well.
Sciatica is a referred-pain pattern - the symptom is in the leg, the cause is higher up - and it is sensitive to two things a back-only page tends to skip: pressure through the buttock and the back of the thigh, and the degree of flexion in the lower spine. Pushing harder into the lumbar area can increase symptoms rather than reduce them. So when both are present, the order flips: get the pressure off the leg first, then add the minimum support that holds the position.
How the priority order differs between the two complaints
Priority
Lower back pain alone
Back pain plus sciatica
First
Lumbar support at your curve height
Seat depth - get the front edge off the back of the knee
Second
Seat height, so the pelvis sits level
Seat pressure - softer or cut-out seat, weight off the buttock
If you buy one specification on this page, buy adjustable seat depth. The front edge of a pan that is longer than your thigh presses into the soft tissue behind your knee, and the two things people do to escape that pressure - perching forward off the backrest, or sliding the pelvis under to get the knees clear - are both worse for the back than the pressure was for the leg.
Published seat depth across the picks on this page
Shorten the pan. A folded towel or a firm cushion against the backrest moves you forward so the front edge clears your knee. If the leg symptoms ease, depth is your variable.
Take the weight off the buttock. A cutout cushion, or simply a softer seat, changes where load goes through the pelvis. If this is what helps, you have learned something a chair review cannot tell you.
Load your feet. Drop the seat until your feet are flat, or put a footrest under them. Legs that hang pull the pelvis backward and increase flexion in the lower spine.
Back the lumbar off. Counter-intuitive and worth trying: set the support lower in force than feels "right" and see whether the leg quietens. How lumbar support should feel describes the target.
Stop sitting still. NIAMS' guidance for prolonged sitting is to get up, move around and switch positions frequently - and for a referred-pain pattern that is not a nice-to-have.
The non-chair answers, honestly placed
Two of them are worth knowing about. A cutout seat cushion is the cheapest useful test on this page and occasionally the whole answer - the coccyx pain page goes into it properly. And a second seat you move to for part of the day beats any single perfect chair, because what aggravates a referred-pain pattern is duration in one position more than the position itself; kneeling chairs for sciatica and saddle stools are the two options we would actually consider.
If your body sits at either end of the height range, fit outranks everything on this page - short sitters with sciatica is the specific case where a standard chair cannot be made to work. And if the pain sits in the hip joint rather than running down the leg, back and hip pain together is the closer match.
The picks in full
1. Best for Placing support without adding pressure
Steelcase Leap v2
The reason this chair leads a page where two symptoms conflict: you can set where the support sits and how hard it pushes independently. That matters because the usual advice for a flat lumbar curve - more support, pushed harder - is exactly what makes a compressed nerve complain. Steelcase publishes a pad that slides up and down the backrest and a separate firmness dial, so you can hold the pelvis upright at low force. The 15.75-inch seat pan is also the shortest fixed pan on this page, which on a sciatic leg is an advantage rather than a limitation. Published: seat height 16 to 20.5 in, back height 25 in, arms 7 to 11 in, 400 lb, 12-year multi-shift warranty.
Who it fits
Anyone with both complaints who has found firm lumbar support unhelpful, and anyone with shorter thighs.
Who it does not fit
Anyone under about 5 ft 1 in, and anyone with long thighs - 15.75 in is fixed and short.
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 Taking the pan off the back of your thigh
Steelcase Series 1
On a page about leg pain, seat depth adjustment is the single most useful control, and this is the cheapest chair in our registry that publishes a real range for it. Steelcase states a functional seat depth of 15.5 to 17.75 inches: that is two and a quarter inches of travel you can use to move the front edge of the seat away from the back of your knee, which is where the pressure that aggravates a sciatic leg usually sits. Seat height runs 16.5 to 21.5 inches, the rating is 400 pounds and the warranty 12-year multi-shift. Adjustable lumbar is a configured option, not standard.
Who it fits
Anyone whose leg symptoms worsen the longer they sit back in the chair, and anyone who wants the depth control without premium pricing.
Who it does not fit
Anyone under about 5 ft 2 in, and anyone who needs adjustable lumbar included rather than specified.
Published specifications
Seat height
16.5"–21.5"
Seat depth
15.5"–17.75"
Weight capacity
400 lb
Lumbar
Optional adjustable lumbar; weight-activated tension as standard
Fit comes before features when a nerve is involved, because a chair that is the wrong size pushes in the wrong place no matter how good its controls are. The Aeron is the only mainstream chair sold in three shells: Herman Miller publishes size A at 14.4 to 19.3 in seat height with a 16 in pan, B at 14.8 to 22.8 in with 17 in, C at 15.8 to 22.8 in with 18.5 in, warrantied to 300, 350 and 400 lb. PostureFit SL adds a pad at the sacrum rather than the lumbar, which holds the pelvis upright without pressing higher up the spine - a useful distinction when the lumbar area is already sore.
Who it fits
Anyone at the ends of the height range, and anyone who wants the pelvis held without force applied to the lumbar itself.
Who it does not fit
Anyone who orders without checking the size chart, and anyone who finds an unpadded mesh seat uncomfortable under a sore buttock.
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)
4. Best for Testing whether seat pressure is the problem
ComfiLife Premium Comfort Seat Cushion
Here as a diagnostic rather than a chair. If your leg symptoms get worse within twenty minutes of sitting and better the moment you stand, pressure through the seat is contributing, and a cushion tells you that for a fraction of the price of a chair. ComfiLife publishes a 17.7 by 13.7 by 2.8 inch memory foam cushion with a U-shaped coccyx cutout and a stated lifetime replacement guarantee. Two honest caveats: adding a cushion raises your effective seat height, so you may need to drop the chair to compensate, and it is a seat cushion with no back support at all.
Who it fits
Anyone who wants to know whether the seat or the backrest is the problem before spending real money.
Who it does not fit
Anyone who needs lumbar support - this provides none - and anyone whose chair is already too tall to drop further.
Sciatica is a symptom pattern with several possible causes, and none of them are treated by furniture. A chair changes load distribution while you sit. Stop shopping and get assessed if you have:
Pain that runs below the knee, or numbness and tingling in the foot
Weakness in a leg or foot, or a foot that catches when you walk
Pain that wakes you at night, or that is worse lying down than sitting
Sudden onset after a fall, a lift, or an impact
Any change in bladder or bowel control, or numbness around the groin - this one is urgent
Pain with unexplained weight loss, fever, or a history of cancer
NIAMS notes that most back pain improves within about six weeks. Leg symptoms that are not improving on that timescale, or that are getting worse week on week, are a reason to be seen rather than a reason to buy a better chair.
We are not doctors, physical therapists or certified ergonomists, and nothing here is medical advice. If you are in real pain, see someone who is qualified to look at it.
Questions people actually ask
What is the best office chair for back pain and sciatica together?+
The Steelcase Leap v2, because it lets you set lumbar height and lumbar firmness separately - so you can hold the pelvis upright at low force rather than pushing hard into an area that is already sore. It also has the shortest fixed seat pan on this page at 15.75 inches, which keeps the front edge off the back of the knee.
Why does lumbar support sometimes make sciatica worse?+
Because the usual fix for a flat lumbar curve is more support pushed harder, and a referred-pain pattern can be sensitive to both the force and the degree of flexion in the lower spine. The practical answer is to keep the support but set it at the lowest force that still holds your pelvis - adjustable firmness is the feature that makes that possible.
Which specification matters most if I have both?+
Adjustable seat depth. A pan longer than your thigh presses behind the knee, and both ways people escape that pressure - perching forward, or sliding the pelvis under - are worse for the back than the pressure was for the leg. Steelcase publishes 15.5 to 17.75 inches of functional depth on the Series 1, the cheapest real range in our registry.
Will a seat cushion help, or do I need a new chair?+
Try the cushion first - it is a cheap test with a clear result. If a cutout cushion changes how your leg feels within a day or two, pressure through the seat was contributing and you now know which specification to shop on. Remember it raises your effective seat height, so drop the chair to compensate.
Is standing all day better for sciatica?+
No, and swapping one static position for another is the common mistake. What aggravates a referred-pain pattern is duration in one position. Alternating is the useful move - standing desk versus office chair and how long you should sit cover the trade-offs.
