What Size Is King Pillowcase

If you’re shopping for bedding, you might be wondering what size is king pillowcase. It’s a common question, as pillow sizes can get confusing. The standard answer is that a king pillowcase fits a king-size pillow, which typically measures 20 inches by 36 inches. But there’s a bit more to it than that, especially with different pillow types and international standards. This guide will walk you through everything you need to know to get the perfect fit.

A standard king pillowcase in the United States is designed to hold a king pillow measuring 20 inches wide by 36 inches long. The pillowcase itself is usually a few inches larger to allow for the pillow’s fullness. You’ll often find king pillowcases with dimensions around 21 inches by 37 inches, or sometimes 20.5 inches by 36.5 inches. This extra room is called the “finish size” and makes it easier to put the pillow in and take it out.

It’s important to note that a king pillowcase is not the same as a standard or queen size. Using the wrong size will lead to a poor fit. A pillowcase that’s too small will be tight and strain the seams, while one that’s too large will look sloppy and the pillow will shift around inside.

King vs. Standard/Queen Pillowcases

To avoid mix-ups, let’s clarify the differences:

Standard Pillowcase: Fits a pillow that is 20″ x 26″. This is the most common size for twin, full, and double beds.
Queen Pillowcase: Fits a pillow that is 20″ x 30″. It’s used for queen beds, but sometimes on double beds for a plusher look.
King Pillowcase: Fits a pillow that is 20″ x 36″. Its extra length is the key identifier.

European King and Other Variations

If you have imported bedding or a European-style king bed, sizes can differ. A European king pillow is often square, measuring 26″ x 26″ or even larger. Always check the label on your pillow or bedding set. An “Oxford” or “Euro” pillowcase refers to these decorative square sizes, not the rectangular king size.

How to Measure Your Pillow for a Case

If you’ve lost the tag or are unsure of your pillow’s size, follow these steps:

Lay the pillow flat on a surface.
Use a fabric measuring tape to measure the width from seam to seam.
Then, measure the length from seam to seam.
Note these dimensions. A true king pillow will be very close to 20″ x 36″.

Accounting for Pillow Loft

Pillow “loft” refers to its thickness or height. A down pillow may be fluffier and need more room than a thinner memory foam one. If your pillow is very full, you might want a “king plus” or “oversized” pillowcase, which offers a bit more fabric to accommodate the volume without feeling tight.

Choosing the Right King Pillowcase Material

The fabric of your pillowcase affects comfort, durability, and care. Here are the most common options:

Cotton: Breathable, easy to care for, and widely available. Look for thread count, but remember a very high count isn’t always better. 200-800 is a good range.
Egyptian or Pima Cotton: These are premium, long-staple cottons known for exceptional softness and strength.
Linen: Highly breathable and gets softer with each wash. It has a distinctive, relaxed texture that’s great for temperature regulation.
Bamboo or Tencel (Lyocell): Known for being silky-smooth, moisture-wicking, and eco-friendly. They are gentle on skin and hair.
Silk or Satin: These materials are smooth and can help reduce hair frizz and skin creases. Real silk requires delicate care, while satin (often polyester) is easier to maintain.

Understanding Thread Count

Thread count is the number of threads woven into one square inch of fabric. While often marketed as a sign of quality, it’s not the only factor. A 400-thread count percale cotton can feel crisp and cool, while a 400-thread count sateen cotton feels silky and warm. The type of weave and fiber quality matter just as much.

Step-by-Step Guide to Buying King Pillowcases

Follow this simple process to ensure you get the right product everytime.

Step 1: Confirm Your Pillow Size

Double-check your pillow’s dimensions as described above. Don’t assume; measure.

Step 2: Decide on Closure Type

How does the pillowcase close? Each has pros and cons.

Envelope Closure: A fabric flap inside the case keeps the pillow tucked in neatly. It’s a clean look.
Zipper Closure: Fully encloses the pillow. Secure, but the zipper can feel scratchy if it’s not covered.
Open End (Traditional): The pillow slides into an open end, which is then folded over. Simple, but the pillow can slip out.

Step 3: Select Your Material Preference

Consider your sleep needs. Do you sleep hot? Prefer crisp or soft textures? Have sensitive skin? Your answers will guide your fabric choice.

Step 4: Check Care Instructions

Before you buy, look at the washing label. Some materials, like linen or silk, require specific care methods that you need to be willing to follow.

Step 5: Purchase and Test

Buy from a retailer with a good return policy. Put the pillowcase on as soon as you get it to check the fit and feel. Wash it before first use to remove any manufacturing residues and soften the fabric.

Common Mistakes to Avoid

Here are a few pitfalls people often run into:

Mixing Up King and California King: A California King bed is longer and narrower than a standard King. However, the pillows are usually the same standard king size (20″ x 36″). Always verify, though, as some Cal King sets may come with longer pillows.
Assuming “Set” Includes King Pillowcases: A king-size sheet set typically includes two king pillowcases. A queen set includes two standard/queen pillowcases. Check the contents list.
Ignoring Shrinkage: Natural fabrics like cotton can shrink by 3-5% on the first wash. If your case is a snug fit brand new, it might become too tight after washing.
Forgetting Decorative Shams: Shams are the decorative covers that go over your pillows and pillowcases. They are a different size and are not meant to be slept on directly. A king sham will be larger than a king pillowcase to fit over it.

FAQs About King Pillowcases

Is a king pillowcase the same as a queen?

No, they are not the same. A queen pillowcase is shorter (20″ x 30″) than a king pillowcase (20″ x 36″). Using a queen case on a king pillow will be very tight and likely damage the seams.

How many king pillowcases come in a set?

A standard king-size sheet set almost always includes two king pillowcases. This is because most king beds use two side-by-side pillows per person.

Can I use standard pillows on a king bed?

You can, but it may look disproportionate. Standard pillows (20″ x 26″) will appear small on a wide king bed. Most people prefer the balanced look of king pillows, which span more of the bed’s width.

What if my king pillow is too thick for a standard case?

Look for terms like “deep pocket,” “extra deep,” or “oversized” king pillowcases. These provide more gusset space to accommodate thicker pillows without straining.

Are all king pillows 20×36?

Most are, but there can be slight variations, especially with older or custom pillows. Some “super king” pillows might be 20″ x 40″. Measuring is the only way to be certain.

Do I need special pillowcases for a body pillow?

Yes. A king pillowcase is 36″ long. A standard body pillow is 54″ long. You need a specifically designed body pillow case, which is much longer.

Caring for Your King Pillowcases

Proper care extends the life and feel of your pillowcases.

Washing: Wash in cool or warm water on a gentle cycle. Use mild detergent. Avoid bleach on colored or delicate fabrics.
Drying: Tumble dry on low heat. Remove promptly to minimize wrinkles. Line drying is gentlest and can prevent shrinkage.
Ironing: If needed, iron on the appropriate setting for the fabric while the case is slightly damp. Linen and cotton often look great with a light ironing.
Storage: Store in a cool, dry place. Avoid plastic bags; use a breathable cotton bag or shelf.

Knowing what size is king pillowcase is the first step to a well-made bed. By understanding the standard dimensions (20″ x 36″), learning to measure your own pillows, and choosing the right material and closure for your needs, you can avoid the frustration of a bad fit. Remember that details like fabric weave, care instructions, and pillow loft all play a part in your final satisfaction. With this knowledge, you can shop confidently and ensure your king-size bed is both comfortable and stylish, providing the perfect place to rest every night.