Herman Miller chair sizes come down to one model: the Aeron is the only Herman Miller ergonomic task chair sold in frame sizes, A (small), B (medium) and C (large), with fixed seat depths of 16, 17 and 18.5 inches. The Embody, Mirra 2, Sayl, Cosm and Lino each ship in one size and rely on adjustment to fit different bodies.
The second number to check is the weight rating. Aeron size C is rated to 400 lb, Aeron size A and the Embody to 300 lb, and the rest of the lineup to 350 lb. Seat depth matters more than either for daily comfort, because it decides whether you can sit back against the lumbar support without the front edge pressing behind your knees. On the Aeron and the Cosm, that number is fixed the day you order.
Herman Miller chair sizes at a glance
| Chair | Sizes | Seat depth | Seat height, standard cylinder | Max user weight | Published user height |
|---|---|---|---|---|---|
| Aeron A | Small | 16 in (41 cm), fixed | 14.75-19 in (37.5-48 cm) | 300 lb (136 kg) | 4 ft 10 in to 5 ft 4 in (147-163 cm) |
| Aeron B | Medium | 17 in (43 cm), fixed | 16-20.5 in (41-52 cm) | 350 lb (159 kg) | 5 ft 2 in to 6 ft 0 in (157-183 cm) |
| Aeron C | Large | 18.5 in (47 cm), fixed | 16-20.5 in (41-52 cm) | 400 lb (181 kg) | 5 ft 10 in to 6 ft 6 in (178-198 cm) |
| Embody | One | 15-18 in (38-46 cm), adjustable | 16-20.5 in (41-52 cm) | 300 lb (136 kg) | Not published |
| Mirra 2 | One | 16.25 in (41 cm) fixed, or 16.25-18 in (41-46 cm) with FlexFront | 16-20.5 in (41-52 cm) | 350 lb (159 kg) | Not published |
| Sayl | One | 16-18 in (41-46 cm), adjustable | 16-20.5 in (41-52 cm) | 350 lb (159 kg) | Not published |
| Lino | One | About 15-18 in (38-46 cm) adjustable, or 16 in fixed | 20.75 in (53 cm) max listed | 350 lb (159 kg) | Not published |
| Cosm | One, three back heights | 15.5-15.9 in (39-40 cm), fixed | 14.875-21 in (38-53 cm) | 350 lb (159 kg) | Not published |
Aeron seat depths are from the Aeron spec page; its seat heights, weight ratings and height bands are from the Aeron store listing, which prints B’s depth as 16.75 in. The other rows are from Herman Miller’s store pages for the Embody, Mirra 2, Sayl, Cosm and Lino, plus the Mirra 2 spec page. Only the Aeron listing gives a user-height band.
US store prices when this was written ran from $965 for a base Lino to $2,395 for an Embody, with the Aeron at $2,305, Cosm High Back at $2,030, Mirra 2 at $1,915 and Sayl at $1,275. All vary with configuration and sales, and none of that money buys fit by itself.
Which Herman Miller chairs come in more than one size?
Only the Aeron. Every other current Herman Miller work chair in the table is a single frame that relies on seat-height adjustment and, on most models, an adjustable seat pan to cover a range of users. The Cosm offers low, mid and high backs, but those change back height only: the Cosm spec page lists the same seat for all three.
With the Aeron, the size letter is a permanent fit decision; there is no seat slider to correct a wrong pick. With the one-size chairs, the decision moves to the configuration screen: the seat-depth option and the cylinder.
Aeron sizes A, B and C
The store’s recommended bands overlap. A covers 4 ft 10 in to 5 ft 4 in, B covers 5 ft 2 in to 6 ft 0 in, and C covers 5 ft 10 in to 6 ft 6 in. That leaves two overlap zones, 5 ft 2 in to 5 ft 4 in (A or B) and 5 ft 10 in to 6 ft 0 in (B or C), and they sit close to where a lot of buyers fall. CDC body-measurement data for August 2021 to August 2023 puts the average US woman at 63.5 in, inside the A-or-B overlap, and the average man at 68.9 in, just under the B-or-C zone.
Height is only half the decision. The weight caps differ (300, 350 and 400 lb), so a 5 ft 3 in sitter over 350 lb is a C on weight alone, whatever the height band says. Herman Miller’s height-by-weight fit grid, and how to break a tie, is decoded in our Aeron A vs B vs C size chart.
The spec page adds two details the store bands hide. First, the steps between sizes are uneven: B’s pan is 1 in deeper than A’s, but C’s is 1.5 in deeper than B’s. Second, B and C share the same 16 to 20.5 in seat height on the standard cylinder, so moving up to C buys pan depth and back height, not a taller seat. Across all cylinder options the spec page lists 14.8 to 22.8 in for B and 15.8 to 22.8 in for C.
How the one-size models stretch to fit
Embody. The widest seat-depth range in the lineup, 15 to 18 in, which covers the Aeron A pan and comes within half an inch of the Aeron C pan. The catch is weight: at 300 lb it shares the lowest rating here with Aeron A. The Logitech G Embody Gaming lists identical seat height, seat depth and weight capacity; it is 1.5 in taller overall at 45 in.
Mirra 2. The base seat is fixed at 16.25 in, close to an Aeron A. The FlexFront option extends it to 18 in. A tall buyer who skips FlexFront to save money ends up with a short-user pan.
Sayl. 16 to 18 in of depth on the store’s adjustable-seat configuration, and an 18 in seat width, the narrowest listed here. Rated to 350 lb.
Lino. The cheapest chair here offers an adjustable-depth seat or a fixed pan of about 16 in. The adjustable range differs by page: 15.13 to 17.88 in on the Lino product-details page, 15.5 to 18.25 in in the store’s option text.
Cosm. The outlier: a fixed pan of 15.5 in on the store (15.9 in on the spec page) and 20 in wide, the shallowest and widest seat in the group. BTOD’s review flags the non-adjustable depth as a limit for taller users and pegs its best fit at medium-build users from 5 ft 4 in to 6 ft 2 in.
Which Herman Miller chair fits your height?
Under about 5 ft 4 in, start with Aeron A or the Cosm, the two models whose standard seats drop below 15 in. Between 5 ft 4 in and 6 ft, Aeron B or any one-size model with adjustable seat depth fits. Over 6 ft, look at Aeron C or a one-size chair that reaches 18 in of depth.
Shorter users. The 16 in floor on most standard cylinders is the usual problem. OSHA’s chair guidance says seat height is right “when the entire sole of the foot can rest on the floor with the back of the knee slightly higher than the seat of the chair.” If 16 in leaves your heels hovering, the fixes are a lower cylinder, Aeron A, the Cosm or a footrest; our guide to chairs for short people covers the desk side.
Taller users. Pan depth tends to bind before seat height does. A fixed 15.5 in Cosm pan or a fixed 16.25 in Mirra 2 pan leaves more of a long thigh unsupported past the front edge.
Heavier users. Over 300 lb rules out the Embody and Aeron A. Over 350 lb leaves Aeron C, at 400 lb, as the only option in this lineup. Treat a weight rating as a hard ceiling, not a comfort target.
How to measure yourself before you order
Three measurements, taken seated on a firm, flat surface:
- Buttock to the back of the knee, with your back against a wall. Compare it with seat depth. OSHA asks for a pan that is “depth adjustable to adequately support taller users while allowing shorter users to sit with their back fully supported,” which means a clear gap behind the knee with your back on the backrest. Our seat pan depth guide walks through it.
- Floor to the underside of the thigh just behind the knee, in the shoes you work in. Compare it with the seat-height minimum in the table.
- Hip width at the widest point. Compare it with seat width (18 in on the Sayl, 19.5 in on the Lino, 20 in on the Cosm), and remember that armrests narrow the usable space. OSHA wants a seat “wide enough to accommodate the majority of hip sizes.”
On an Aeron size boundary, these numbers break the tie better than the height band does.
Does a bigger chair size fix back pain?
No. The right size removes one source of strain, a pan that is too deep or too shallow for your thighs, but it does not treat anything. If you already have back, hip or leg pain, see a clinician for a diagnosis before spending $1,000 to $2,400 on a chair.
Once the size is right, the rest is setup. Start with how to adjust lumbar support, then work through the chair adjustments for lower back pain.
Warranty does not change with size
All six chairs carry a 12-year warranty on Herman Miller’s listings. Nothing there varies by size, so choosing a C over a B is purely a fit call. For arms, tilt and lumbar, our 10-point ergonomic chair checklist picks up where sizing leaves off.
FAQ
does herman miller make a small office chair
Yes, the Aeron size A is Herman Miller’s small chair, recommended for users from 4 ft 10 in to 5 ft 4 in and up to 300 lb. It has a 16 in seat pan and a 14.75 to 19 in seat height on the standard cylinder. The one-size models have no petite version.
is the herman miller embody one size fits all
Yes, the Embody comes in one size, with a seat depth that adjusts from 15 to 18 in and a 16 to 20.5 in seat height on the standard cylinder. That range covers the Aeron A pan and comes within half an inch of the Aeron C pan. The limit is weight: Herman Miller rates it to 300 lb, below most of its lineup.
can you change the size of an aeron chair
No. The Aeron’s size letter is built into the frame, seat pan and back, and the chair has no seat-depth adjustment, so a B cannot be adjusted into an A or C later. Arms, tilt and lumbar adjust depending on configuration, but none of them changes pan depth, so measure before ordering.
what herman miller chair is best for tall people
The Aeron size C is the default for tall users: Herman Miller recommends it from 5 ft 10 in to 6 ft 6 in, with an 18.5 in pan and a 400 lb rating. The Embody, Sayl and Mirra 2 with FlexFront also reach 18 in of depth. Skip the Cosm’s fixed 15.5 in pan.
Related across the network
- Best Ergonomic Chair for Long Hours: What the Specs Tell You — ergoranker.com
- Best Ergonomic Chairs Under $1,000 for Long Workdays — ergoranker.com
