Best Throw Pillow Sizes for Armchairs: Style Meets Comfort

An armchair is more than just a seat—it’s a design accent. The right throw pillow adds comfort while enhancing the shape and scale of the chair. But when it comes to pillow sizes, proportion is everything.

If your pillows feel bulky or disappear into the seat, it’s time to rework the dimensions. This guide helps you find the ideal pillow sizes to match your armchair’s form and function.

Why Size Matters on Armchairs

Armchairs are smaller and more structured than sofas. That’s why oversized or too many pillows can overwhelm the frame or hide the design. Choosing the right dimensions ensures your pillows look intentional—not crowded.

Recommended Throw Pillow Sizes

Here are the best options for most armchairs:

• 20x20” square pillow – A classic fit that works for deep or wide chairs
  
  

• 18x18” square pillow – Better for upright or modern-style armchairs
  
  

• 12x20” lumbar pillow – Great for support and layering in minimal spaces
  
  

💡 Use a 1–2" larger insert for a fuller, designer-style finish.

Match Pillow Size to Chair Style

Keep the arrangement to 1 or 2 pillows total—less is more when styling chairs.

Shop Armchair-Friendly Pillow Covers

At Pillowhan, we offer a wide selection of pillow covers in 18x18”, 20x20”, and 12x20” sizes—perfectly suited for armchairs of every style.

➡️ Explore pillow covers by size

Need More Guidance?

Looking to style other seating areas too?
🧭 See our Loveseat Pillow Size Guide