Picked on published fit specifications, not on hands-on testing. How we pick.
The short answer
Four chairs in our registry are rated to 400 lb or more: the HON Ignition 2.0 Big and Tall at 450 lb, and the Steelcase Leap v2, Steelcase Series 1 and Herman Miller Aeron size C at 400 lb. Capacity is only half the decision - a 400 lb rating on a 19-inch seat is still the wrong chair, so read the seat width next.
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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 We do not publish prices — each button opens the current price on the retailer's own page.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: HON Ignition 2.0 Big and Tall 18.74" · Steelcase Leap v2 15.75" · Steelcase Series 1 15.5"–17.75" · Herman Miller Aeron 16"–18.5"
A capacity number is not a fit
The weight rating answers one question: will the gas lift, base and mechanism take your weight without failing? It answers nothing about whether you will be comfortable in the chair, and that is where most heavy-duty purchases go wrong.
Two chairs can both be rated to 400 pounds and be completely different products. A reinforced base and a stronger cylinder under a standard 19-inch seat gives you a higher number on the same chair. A seat that is three or four inches wider gives you somewhere to sit. Only the second one changes your day.
Published figures for every chair in our registry rated to 400 lb or more (see each review for the source)
Chair
Capacity
Seat width
Seat depth
Warranty
HON Ignition 2.0 Big and Tall
450 lb
23 in
18.74 in
Full lifetime
Steelcase Leap v2
400 lb
19.25 in
15.75 in
12-year multi-shift
Steelcase Series 1
400 lb
Not published
15.5-17.75 in
12-year multi-shift
Herman Miller Aeron, size C
400 lb
Not published
18.5 in
12-year, 3-shift
Herman Miller Aeron, size B
350 lb
Not published
17 in
12-year, 3-shift
Herman Miller Aeron, size A
300 lb
Not published
16 in
12-year, 3-shift
The bottom two rows are on that table deliberately. The Aeron is frequently cited as a 400-pound chair, and that is true of exactly one of its three sizes. Herman Miller publishes the breakdown; most retail listings do not repeat it.
Read seat width before you read anything else
Seat width is the specification that decides whether a chair is actually built for a larger body, and it is published far less often than capacity. The spread on this page runs from 19.25 inches to 23 inches, which is nearly four inches of difference between two chairs you would find in the same search results.
Measure the seat you already have. Measure across the pan at its widest usable point, then measure yourself seated across the hips. If you are within an inch of the pan edges, width is your binding constraint and capacity is not.
Watch the armrests. A wide pan between two fixed arms is not a wide seat. Arms that adjust outward in width, or that can be removed, add usable space that no seat-width figure captures.
Treat an unpublished width as unknown. Not as fine. We mark it as not published above rather than estimating it, because a guessed figure is worse than an admitted gap.
Capacity, warranty and the word that matters
A capacity figure and a warranty are two statements about the same thing - how long the maker expects the mechanism to survive - and the warranty is usually the more informative one.
Note the wording on both Steelcase chairs here: 12-year multi-shift. That is cover for a chair used across more than one shift a day, which is a much stronger claim than twelve years of ordinary single-shift use. HON's full lifetime warranty on the Ignition 2.0 Big and Tall is in the same category of statement. A three-year warranty on a 330-pound budget chair is also a statement, and it is telling you something different.
They get sold as one category and they are not. "Big" is width and capacity; "tall" is seat height, seat depth and back height. A chair can be excellent at one and useless at the other:
Heavy but average height: capacity and seat width decide it. The HON leads, the Series 1 is the value pick.
Heavy with back pain: the capacity list and the lumbar list overlap less than you would hope - best office chairs for lower back pain is the other half of the decision.
What we are not listing, and why
There are chairs on the market advertising 500 and 600-pound capacities. None are in our registry, because we only list products whose figures we could read on a manufacturer or authorized-retailer page, and the claims at the top of that range are mostly made in marketplace listing copy with nothing behind them. We would rather show you four chairs with sourced numbers than ten with confident ones. That rule is set out in how we pick, and every figure on this page links to where we read it.
The picks in full
1. Best for The highest rating with a seat to match
HON Ignition 2.0 Big and Tall
This is the only chair in our registry above 400 lb, and the reason it leads is that the seat grew with the rating. The published figures are a 450-pound capacity, a 23-inch seat width, an 18.74-inch seat depth with a slider and a 24.75-inch back height, behind HON's full lifetime warranty. That 23-inch width is the number most chairs sold as big-and-tall quietly fail to provide: a reinforced base under a standard 19 or 20-inch pan is a higher number on the same chair, not a bigger chair. Seat height is published at 17 to 21.5 inches, which is a conventional range rather than a low one.
Who it fits
Anyone who needs genuine width as well as capacity, and anyone who wants a lifetime warranty on the mechanism.
Who it does not fit
Anyone under about 5 ft 5 in - the 17-inch floor is high, and the 18.74-inch pan is long. Anyone who wants a fine-grained lumbar control.
2. Best for 400 lb with the best adjustment on the list
Steelcase Leap v2
If the capacity is the requirement and the adjustment is what you actually want, this is the pick. Steelcase publishes a 400-pound rating, a 19.25-inch seat width, a 15.75-inch seat depth, a 25-inch back and a 12-year multi-shift warranty - and the lumbar is the only one in our registry with height and firmness as separate dials. The honest limitation is the pan: 15.75 inches is short, so a tall and heavy sitter gets the rating but not full thigh support. Note what the multi-shift wording means in practice: Steelcase is warrantying this for three shifts a day rather than one, which is a far stronger statement than a bare year count.
Who it fits
Anyone at or near the rating who sits all day and wants support they can tune.
Who it does not fit
Anyone who needs seat width beyond 19.25 inches, and tall sitters who want a deeper pan.
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
The cheapest 400-pound chair here by a wide margin, and the specification is not a stripped-down version of the rating. Steelcase publishes a 400-pound capacity, a functional seat depth sliding across 15.5 to 17.75 inches, a 16.5 to 21.5 inch seat height and the same 12-year multi-shift warranty as the Leap. What you give up is the Leap's lumbar firmness dial and some of the arm adjustment; the base chair uses weight-activated tension and no targeted lumbar, so specify the adjustable lumbar option if your back wants placing. For most people at this rating it is the sensible purchase.
Who it fits
Anyone who wants the rating and the commercial warranty without premium money.
Who it does not fit
Anyone needing a wide seat - Steelcase does not publish a seat width for it in the spec guide we cite. Anyone under about 5 ft 2 in.
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
The Aeron reaches 400 pounds, and it is the one chair on this page where the rating depends entirely on which chair you order. Herman Miller's size and fit reference warranties the A to 300 lb, the B to 350 lb and only the C to 400 lb, with seat depths of 16, 17 and 18.5 inches and seat heights of 14.4 to 19.3, 14.8 to 22.8 and 15.8 to 22.8 inches respectively. So if the capacity is the reason you are here, the C is the only answer, and the C is also the deepest pan in the family. Order a B because it is the default and you have bought a 350-pound chair. 12-year, three-shift warranty across the range.
Who it fits
Larger sitters who want mesh and shell sizing, and who will specify the C deliberately.
Who it does not fit
Anyone who wants padding, anyone under about 5 ft 6 in who needs a C for the rating, and anyone ordering without naming the size.
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)
What office chairs have a 400 lb weight capacity?+
In our registry: the Steelcase Leap v2, the Steelcase Series 1 and the Herman Miller Aeron in a size C are all rated to 400 lb, and the HON Ignition 2.0 Big and Tall is rated to 450 lb. The Aeron sizes A and B are rated to 300 and 350 lb respectively, so the size matters.
Is a 400 lb chair enough if I weigh 380?+
It is within the rating, and we would still look at the chair above it. A published capacity is a maximum rather than a comfortable operating point, and the cylinder, base and casters all last longer with headroom. The 450-pound HON is the one with headroom here.
Does a high weight capacity mean a wider seat?+
No, and this is the trap. A reinforced base under a standard 19-inch pan raises the number without making the chair bigger. Seat width is a separate specification and it is published much less often - the spread on this page is 19.25 to 23 inches.
Which 400 lb chair is best for a tall person?+
The HON on seat depth and back height, with the caveat that its 17-inch seat height floor is high and its pan is long. The Leap v2 has the better adjustment but a 15.75-inch pan, which is short for a tall sitter. The trade-off in full is on best big and tall office chairs.
Are there office chairs rated above 450 lb?+
Products advertising 500 lb and above exist. None are in our registry because we could not read those figures on a manufacturer or authorized-retailer page, and we do not list a specification we could not source.
