Guide · 2026-07-29
Herman Miller Aeron Size Guide (A vs B vs C)
Bottom line
Aeron uses three sizes. Remastered product literature rates Size A to 300 lb, Size B to 350 lb, and Size C to 400 lb, with seat depths roughly 16.4", 17", and 18.9". Height guidance across Remastered sizes is about 4'8"–6'7". When in doubt between B and C, prioritize seat depth and hip width over height alone.
Why Aeron is sized
Unlike one-size task chairs, Aeron changes frame geometry across A/B/C. That affects seat depth, back height, and overall envelope—not just the cylinder sticker.
Classic vs Remastered
Classic Aerons (pre-2016) generally topped out around 300 lb with a slightly narrower height story. Remastered (2016+) introduced 8Z Pellicle, PostureFit SL, Harmonic 2, and expanded capacity by size. Used listings often mix generations—check the tilt and lumbar design.
Practical fitting tips
Sit so your hips fit the seat pan without hard edge pressure. If your thighs hang off a Size B, try C. If your feet can’t plant even on a low cylinder, reconsider size or desk height before forcing a tall frame.
FAQ
- Can I convert an Aeron from Size B to Size C?
- Not practically. Size is structural. Buy the correct frame.