School of Soft Goods: Pillow Sizing

We often have people ask us, what size pillows they need for their sofa or chairs. 
The answer isn't always simple. 
Sofa sizes vary tremendously. The variance between an 18" and a 26" is visually significant, as you can see below.  (note- it's rare we do an 18" or a 26" for a sofa, we usually reserve a 26" for a bed).
In most cases, we suggest 22" paired with a 20" for sofas, and 16x20" or 22"s in chairs.

General rule of thumb... 
If the sofa back cushion (from seat to top of back) is less than 24" we recommend the following setup: 

If sofa has back 24" or higher, we recommend:

Smaller size chairs, a 16x20 is a great look.

Larger back or wider chairs a 20 or a 22 will do: 

Following these guides will help you get the best scaled pillows for your furnishing.