Living room

Throw pillow size guide: what size pillows for your sofa

By the Blankspace design teamUpdated October 21, 20265 min read

The short answer

Most standard sofas suit 20- or 22-inch square throw pillows. Use 18-inch pillows on low-backed or compact sofas, and 22- to 24-inch pillows on deep or tall-backed sofas. Lumbar pillows, typically 12×20 or 14×24 inches, go in front of squares. Fill each cover with an insert one size up, such as a 20-inch insert in an 18-inch cover, for a full look.

Remember

Common squares: 18, 20, 22 and 24 in; 20 to 22 in suits most sofas.
Lumbar pillows are typically 12 x 20 or 14 x 24 in.
Scale to the sofa: bigger pillows for deep seats and tall backs.
Use an insert about 2 in larger than the cover for a plump look.
Typical counts: 2 on a loveseat, 3 to 4 on a sofa, 5 to 7 on a sectional.

Contents

Standard throw pillow sizes

Throw pillows come in a handful of standard sizes, which makes covers and inserts easy to mix and replace. Sizes are given for the cover, measured seam to seam when the cover lies flat.

Size	Shape	Best for
16 x 16 in (41 x 41 cm)	Small square	Accent chairs, beds, layering in front of larger pillows
18 x 18 in (46 x 46 cm)	Square	Armchairs, compact and low-backed sofas, loveseats
20 x 20 in (51 x 51 cm)	Square	Most standard sofas; the most versatile size
22 x 22 in (56 x 56 cm)	Large square	Standard to deep sofas, sectionals
24 x 24 in (61 x 61 cm)	Oversized square	Deep sofas, tall backs, the back row of a layered arrangement
12 x 20 in (30 x 51 cm)	Lumbar	Armchairs, front of an arrangement, lower-back support
14 x 24 in (36 x 61 cm)	Lumbar	Sofas and beds
14 x 36 in and longer	Long lumbar	Beds, long benches, the center of a long sofa

Round pillows and bolsters exist too, typically used as a single accent rather than as the backbone of an arrangement.

How to choose the right size for your sofa

Throw pillows should look like they belong to the sofa, so size them against two measurements: the height of the back and the depth of the seat.

Back height: measure from the top of the seat cushion to the top of the back. The largest pillows should sit below the top of the back, or only just reach it. Pillows that tower over the backrest look top-heavy and block the view across the room.
Seat depth: deep seats, around 24 in or more of usable depth, leave a gap behind your back when you sit. Larger pillows, 22 to 24 in, fill that gap and make a deep sofa comfortable for people who want to sit upright.
Low, shallow sofas: a sofa with a low back or a compact seat suits 18 to 20 in pillows. Oversized ones eat up the seat and push people forward.
Arm height: pillows propped against a low arm look best at or below the arm's top; against a tall arm, a larger square fills the corner better.

Sofa type	Main pillow size	Layer with
Compact sofa or loveseat, standard back	18 to 20 in	12 x 20 in lumbar
Standard sofa (about 80 to 90 in long)	20 to 22 in	18 in square or 14 x 24 in lumbar
Deep-seat sofa	22 to 24 in	20 in square or lumbar
Low-back, low-profile sofa	18 to 20 in	12 x 20 in lumbar
Sectional	22 to 24 in in the corner, 20 to 22 in elsewhere	Lumbar or 18 to 20 in squares

A low, horizontal design like the Orizzonte calls for smaller, lower pillows that keep its line; a compact sofa like the Borgo works with 18 to 20 in squares rather than oversized ones.

Orizzonte by Blankspace — Shown: Orizzonte, Blankspace Italia, from $8,140.

How many throw pillows by sofa size

There's no fixed number, but these counts look balanced on most sofas and still leave room to sit.

Sofa	Typical length	Pillows	Example arrangement
Loveseat	52 to 68 in (132 to 173 cm)	2	One 20 in square at each end
Standard sofa	72 to 90 in (183 to 229 cm)	2 to 4	Two 22 in squares, plus two 20 in squares or one lumbar
Large sofa	90 to 100 in (229 to 254 cm)	4 to 5	Two 22 to 24 in squares, two 20 in squares, one lumbar in the center
L-shaped sectional	Varies	5 to 7	Large squares at the corner and both ends, smaller layers between
U-shaped sectional	Varies	6 to 9	Repeat the corner grouping in each corner, ends kept simpler

Comfort is the real limit. If people have to move pillows to sit down, there are too many. On a sofa used daily, fewer and larger pillows are more practical than many small ones.

Arrangements: odd vs even

Even and symmetrical

Matching pairs at each end, mirrored, are the classic arrangement. It looks calm and ordered, suits traditional and formal rooms, and is the easiest to get right. A typical version: a large square at each end with a slightly smaller square in front.

Odd and asymmetrical

Three or five pillows feel more relaxed and collected. A common approach is two pillows at one end and one at the other, or a pair at each end with a single lumbar in the middle. Asymmetry works best when the pillows are still balanced in visual weight: a large pillow on one side can be offset by two smaller ones on the other.

Layering rules

Put the largest pillows at the back and the ends; work smaller toward the front and the center.
Change size by about 2 in or more between layers so the layering reads as intentional.
Mix a solid, a pattern or texture and a smaller-scale pattern rather than several busy prints at the same scale.
Repeat each color at least twice across the sofa so nothing looks stray.

Inserts: size up for fullness

The insert, the pillow form inside the cover, decides whether a throw pillow looks plump or flat. The usual rule is to choose an insert about one size up, roughly 2 in larger than the cover.

Cover size	Insert for a full look
16 in	18 in
18 in	20 in
20 in	22 in
22 in	24 in
12 x 20 in lumbar	14 x 22 in or similar

An oversized insert fills the corners of the cover, which otherwise tend to droop, and gives the pillow a soft, rounded profile. Some people prefer the same size insert for a flatter, tailored look, especially with polyester inserts, which are firmer and can strain a cover's seams if oversized. If a cover zipper is hard to close, the insert is too large.

Down, feather or polyester inserts

Down and feather blends: soft, heavy and moldable. They hold the classic "karate chop" crease, compress when you lean on them and recover with a shake. Higher down content feels softer; higher feather content is firmer and more affordable. They need regular plumping and may shed a little.
Down alternative: polyester fiber made to feel like down. Softer than standard polyester, a reasonable choice for allergy concerns, and usually machine washable, though it tends to flatten sooner than real down.
Polyester fiberfill: inexpensive, springy and holds a rounder shape. It doesn't crease or mold as readily and may flatten or clump over time. Good for outdoor and children's pillows.
Foam: firm and structured, used mainly for bolsters and very tailored looks.

Check whether covers are removable before buying; a zipper makes cleaning and seasonal changes far easier. Use the same insert type across an arrangement so the pillows sag and recover in the same way.

Pillows with the rest of the room

Throw pillows are the easiest way to change a sofa's color and texture without changing the sofa. Pick them after the sofa, using it as the base.

Leather sofas: textured fabrics like linen, wool or boucle add contrast and stop pillows sliding on smooth leather. A best-seller like the Piazza, in protected leather, is a good example of a base that takes almost any fabric.
Patterned sofas: keep pillows mostly solid and pull a color from the pattern.
Family sofas: choose washable or performance covers, and fewer pillows.
Sleeper sofas: keep the count low so pillows are quick to clear when the bed comes out; the Riva, with a hidden queen sleeper, is one to plan around.

For choosing the sofa color itself, see our sofa color guide, and for covering choices, the upholstery fabric guide. Browse rugs and accessories to complete the room.

Questions people ask

What size throw pillows for a sofa?

For most standard sofas, 20- or 22-inch square pillows work best. Use 18-inch pillows on compact or low-backed sofas and 22- to 24-inch pillows on deep or tall-backed sofas. Lumbar pillows of 12 by 20 or 14 by 24 inches can be layered in front.

What is the most common throw pillow size?

The most common sizes are 18 and 20 inches square. 20 inches is the most versatile for sofas, while 18 inches suits armchairs and smaller sofas. Larger 22- and 24-inch squares are common on deep sofas and sectionals.

How many throw pillows should go on a sofa?

Typically two on a loveseat, two to four on a standard sofa, four to five on a large sofa and five to seven on an L-shaped sectional. If people have to move pillows out of the way to sit down, there are too many for daily use.

Should a pillow insert be bigger than the cover?

Usually yes. An insert about 2 inches larger than the cover, such as a 20-inch insert in an 18-inch cover, fills the corners and gives a full, plump look. For a flatter, tailored look, or with firm polyester inserts, the same size works.

Should throw pillows be odd or even numbers?

Either works. Even, symmetrical pairs look calm and formal and are the easiest to get right. Odd numbers, such as three or five, feel more relaxed and collected, as long as visual weight is balanced across the sofa.

Are down or polyester pillow inserts better?

Down and feather inserts are softer, heavier and hold a crease, but need plumping. Polyester fiberfill is cheaper, springier and holds a rounder shape, but can flatten over time. Down alternative sits in between and suits people who prefer to avoid feathers.

What size lumbar pillow for a sofa?

Lumbar pillows are typically 12 by 20 or 14 by 24 inches. A 14 by 24 inch lumbar suits most sofas, often placed in front of square pillows or alone in the center. Longer lumbars of 36 inches or more work on large sofas and beds.