What Size Throw Pillow Should I Pick?

January 24, 2022 | Casper Editorial Team

You might already know what a throw pillow is but if you’re new to these decorative cushions, you may be looking for more information before you buy throw pillows for your couch or bed. For a style that never loses shape, throw pillows are the ultimate home accessory. But with so many choices, where should you start? And what is the standard throw pillow size?

While the standard 18” square throw pillow is common, don’t be afraid to step outside of the box—there’s an entire world of throw pillow sizes! 

From square to lumbar, Casper has throw pillows in shapes and sizes that fit your home aesthetic no matter what you’re looking for.

Let’s dive into which throw pillow size might best cushion your set.

What Size is a Standard Throw Pillow?

Throw pillows come in all shapes and sizes. However, a few standard sizes stick out above the rest—particularly the 18” x 18” design.

Why a medium-sized square pillow? Basically, these throw pillow dimensions fit on a range of furniture—anything from armchairs to sectionals. But if 18” x 18” isn’t your jam, don’t worry—decorative pillows really have no standard size. Choose what you like!

Throw Pillow Sizes Chart

When it comes to throw pillow sizes, you have quite the selection. Different sizes and shapes are at your disposal for cushiony flair. Let’s review some of the most popular sizes for decorative throw pillows.1

Square (or Euro Sham)

The most popular throw pillow shape is square (aka Euro). Square throw pillows are incredibly versatile, with easy stacking and mix-and-match ability. You’ll often find square throw pillows in these dimensions:

  • 16” x 16”
  • 18” x 18”
  • 20” x 20”
  • 22” x 22”


For cozy knits to chic velvets, a round throw pillow covers a range of styles. Round designs are similar in size to square throw pillows, hovering around 18” to 22” in diameter. Usually, they’re used singularly as accent pieces (round shapes are tough to layer).

Lumbar (or Body)

Rectangular and large, lumbar throw pillows are one of the more purposeful shapes—they support your spine! With an elegant and ultra-comfy backrest like our Lumbar Throw Pillow, you can upgrade your afternoon read.

From the couch to your bed, one of these lumbar pillow sizes can offer stylish and supportive rest:

  • 10” x 20”
  • 12” x 20”
  • 12” x 40”
  • 14” x 22”


Like a big cylinder, neckroll pillows are both stylish and functional. They fill out negative space on long couches or large beds, while also providing support for tired necks when lying down. Common sizes of bolster or couch pillows include 6” diameters with 12” length or 7” diameters with 20” length.

What Size Throw Pillow Should I Pick?

Wondering which pillow size is best for you? The right size throw pillow can be chosen with a few considerations. So, how do you choose a pillow?

Throw pillow designs come down to a few factors—layering, furniture type, and purpose. Let’s explore how each impacts your decorative pillow sizes.


The number one factor for throw pillow size? Its furniture home.

Not every size pillow fits with every furniture piece (lumbar pillows and armchairs don’t exactly mix). To find a throw pillow that balances space, consider its furniture backdrop:

  • Small sofas or loveseats – Usually seating just two, a petite sofa has a little wiggle room for throw pillows. Try just one lumbar pillow along the seat, or stack the corners with one or two Euro pillows.
  • Large sofas – With so much space, large sofas are the ultimate throw pillow experiment. Try pillow combinations of lumbar, neck roll, or Euro pillows here! The general rule is no more than one pillow per seat cushion section—otherwise, things get a little crowded.
  • Armchair – For a single seat, stick with a single Euro throw pillow or round pillow. Anything larger, and you’ll risk taking up any sitting room.
  • Bed – Throw pillows on the bed all depend on bed size. California King size bed? Go for a few throw pillows stacked in front of your sleeping pillows. Neck rolls or even round designs make great centerpieces. Twin bed? Just one smaller Euro pillow fills the space.


Looking for just a touch of decor on your armchair? Or need to fill a sectional sofa? Depending on space, you’ll have to choose between single or multiple throw pillows—and that impacts sizing.

The general rule is the more throw pillows, the smaller the size. However, a multi-pillow arrangement can certainly mix shapes and sizes! Variety adds different textures and draws the eye and creates an inviting home. Just make sure you don’t cover all available sitting space with different types of pillows


Some pillows are there to look pretty. Some pillows are there to prop up seated guests. Some do both! 

When choosing for style, pillow size is more about the visuals. Choose dimensions that match the furniture’s space and shape (I.e., no massive lumbar pillows on twin beds). When choosing for function, look for throw pillows that someone can easily lean against—a smaller square pillow, lumbars on couches, bolsters on beds, etc.

Stylish Support with Casper’s Throw Pillows 

Forget the starchy and stiff cushions of the past. Casper’s structured yet soft throw pillows offer the best of both worlds—style and seated support. 

Need more cozy warmth on your sofa? Or a neck rest in your bed? Our color-block pillows have your back (literally). No matter the size, Casper’s designs bring all the chic reinforcement you need. 


  1. Freshome. The Ultimate Guide to Buying Throw Pillows.  https://www.mymove.com/home-inspiration/decoration-design-ideas/freshomes-throw-pillow-buying-guide/