
The ideal size for couch throw pillows is determined by the scale and depth of the sofa itself. Different types of couches require different pillow dimensions to achieve a balanced and proportionate look.
For a regular or standard-sized sofa, the most common and effective square pillow sizes are 20x20 and 22x22 inches. These can be paired with lumbar pillows that are between 11 and 14 inches high and 19 to 20 inches wide.
If you have a small sofa, a settee, or a couch with a low back, it is best to scale down the pillows. Recommended square sizes include 17x17, 18x18, and 20x20 inches. For these smaller frames, suitable lumbar pillows would measure between 10 to 13 inches in height and 12 to 19 inches in width.
Conversely, large or deep-seated sofas can accommodate larger pillows. Square sizes of 20x20, 22x22, and even 24x24 inches work well to fill the space. Lumbar pillows for these larger sofas should be scaled up accordingly, typically measuring 13 to 15 inches high by 20 to 22 inches wide.
For sectional sofas, which offer more surface area, a mix of sizes is often effective. The best square pillow sizes are generally 18x18, 20x20, and 22x22 inches. Accompanying lumbar pillows can range from 11 to 15 inches in height and 19 to 21 inches in width.


