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Herman Miller Aeron Size Chart: How To Size an Herman Miller Aeron Chair

Are you considering the Herman Miller Aeron chair to complete your office interior design? Smart choice. But wait, you do know that the Aeron chair comes in three sizes, right? So, which chair is right for you?

In this post, we’ll break down the entire Herman Miller Aeron chair and review the Herman Miller Aeron Size Chart to provide you with the best sizing guide. Additionally, we’ll walk you through the differences between Herman Miller’s old and new models to help you acquire the right chair model for your needs.

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What Size Herman Miller Aeron Chair Do I Need?

The Herman Miller Aeron chair has three sizes: size A, size B, and size C. These sizes translate to small, medium, and large, respectively, and are suitable for a broad range of users. Generally, Herman Miller’s size B is suitable for most people. It is recommended for people between 5’2” to 6’6” tall and weighing around 130 to 325 pounds.

Let’s address the overall build of the Herman Miller Aeron chair. This wonderful masterpiece comes in three sizes that cater to a wide range of users. The three sizes are size A, size B, and size C. More simply, they are categorized as small, medium, and large, respectively. Refer to the picture below to understand the overall dimensions of the chair:

Herman Miller Aeron Size Chart

Taken from

Herman Miller did an amazing job of making it easy for the users to find the best size. The Herman Miller Aeron size chart below is to help you find the perfect size based on your height and weight. The vertical axis represents your height, while the horizontal axis represents your weight. To get a better idea, see the chart below: 

How to Tell the Size of Herman Miller Aeron Chair

You might think: how can I tell what size my Herman Miller Aeron is? It’s very simple. The genius folks at Herman Miller created a subtle way to tell the Aeron chair size. All you need to do is to put your fingers on the backside of the backrest. You will find ‘special markings’ or dots. The dots determine the size of the chair.

If you feel one dot, the Aeron chair is size A. If you feel two dots, this means that the Aeron chair is size B. If you feel three dots, the Aeron chair is size C. These dots help you determine the size of the chair with a simple touch. Check out this quick video on where to find the dots:

What Size Herman Miller Chair Do I Need?

Now that you’ve properly understood the entire Herman Miller Aeron chair size chart let’s take the time to recap everything we’ve learned. To help answer the question of what size Herman Miller chair do I need easier for you, here’s the general recommendation based on your height and weight: 

  • Purchase a size A if: you are between 4’10” and 5’9”, weighing between 90 to 150 lbs.
  • Buy a size B if: you are between 5’2” and 6’6”, weighing between 130 to 325 lbs.
  • Get a size C if: you are between 5’3” and 6’6”, weighing between 180 to 350 lbs.

While there are some overlaps between measurements, you can refer to the general recommendation above to choose the best size for you. Don’t worry; Herman Miller comes with an industry-leading 12-year warranty and a 30-day to return the chair for a full refund. Now that’s top-notch customer service!

PRO TIP: While the Herman Miller Aeron chair is one of the best office chairs available, many still question whether the Embody chair is better. To find out which came out on top, check out our complete comparison of Aeron vs. Embody to help you decide which Herman Miller chair is the best.

Comparing the Aeron Classic and the New Aeron

While there isn’t a lot that sets apart the New Aeron model from its predecessor in terms of dimensions and weight, and height recommendations, numerous parts of it have been remastered.

Herman Miller made sure Don Chadwick, Aeron’s original designer, had a hand in creating this new piece. As such, you’ll notice it retains its human-centered design that offers a comfortable position to a range of postures.

Let’s go over the new Aeron chair’s improved features.

Back Membrane

The Classic Aeron chair became iconic for its gorgeously designed web membrane, a section that was also upgraded in the new model. In particular, the soft, translucent fabric that covers the chair’s back was made to have even more tensile strength this time around.

The 8Z Pellicle membrane is designed so that certain parts of it give more or less push to the different parts of your back, which makes for a more ergonomic chair. The name 8Z comes from this membrane’s eight individual zones, each with specific tension adjustments.


In addition to the back-membrane facelift, the chair’s balance was also improved. They gave it a more slimmed-down tilt mechanism to create a smoother balance point. This allowed for a more focused upright positioning. Additionally, it also makes titling in this new model feel a lot more natural.

Back Support

Herman Miller went all out with this new Aeron’s back support feature, that’s for sure. This one offers more nuanced sacrum and lumbar back support, thanks to the PostureFit SL feature.

Using this feature, users can adjust the back of the chair to minute degrees so that it aligns with their unique spinal curvature. Imagine how this would be a godsend for people with spinal problems!

Of course, it’s important to note that this doesn’t come in all-new Aeron models. Instead, it’s an optional add-on along with the classic lumbar support pad featured in the original model.

Which Herman Miller Chair Is For You?

And there you have it, the complete Herman Miller Aeron Chair size chart and some key differences between the classic and newly released model. We hope our simple post can help you choose the best size to complete your office setup. After all, the Aeron chair is one of the best office chairs you can buy, and arguably the top pick for the best Herman Miller office chairs ever. Have a good day! 🙂

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