What Size Is A King Size Pillowcase

When you’re buying new bedding, knowing the correct sizes is key to a good fit. You might be wondering, what size is a king size pillowcase? It’s a common question, as pillow sizes can be confusing. This guide will give you the exact measurements you need, plus tips for choosing the right style and material for your king pillows.

A standard king size pillowcase measures 20 inches by 36 inches (51 cm by 91 cm). This size is designed to fit a king size pillow insert, which is typically 20 inches by 36 inches. It’s important to note that this is the size for a standard king pillow, often called an “Eastern King” pillow. There is also a “European King” or “Euro King” size, which is a large square, but that’s a different product altogether.

The 20×36 dimension is the most common answer across major bedding brands and retailers. However, you might find slight variations. Some cases might be 20.5 inches wide or 37 inches long to allow for a little extra room, especially if you have a plush pillow. Always check the product label for the exact measurements before you buy.

Why the Exact Size Matters

Using the right size pillowcase does more than just look neat. A case that’s too small will stretch tightly over your pillow, causing seams to strain and fabric to wear out faster. It can also make your pillow feel overly firm. A case that’s too large will look baggy and wrinkled, and your pillow can shift around inside it during the night, which isn’t very comfortable.

Getting the fit right ensures your bedding looks crisp and inviting. It also protects your pillow insert from dust, oils, and stains, helping it last longer. A well-fitting case is simply more pleasant to sleep on.

King vs. California King Pillowcases

This is a crucial distinction that trips up many shoppers. A standard king bed and a California king bed use different sized pillows.

Standard King Pillow: 20″ x 36″. Fits a standard king mattress (76″ x 80″).
California King Pillow: 20″ x 40″. Fits a California king mattress (72″ x 84″).

As you can see, a California king pillow is four inches longer. If you try to put a Cal king pillow into a standard king case, it won’t fit. Always match your pillowcase length to your pillow length. If you have a Cal king bed, you’ll need to specifically search for “California king pillowcases.”

Types of King Pillowcase Closures

Pillowcases close in different ways, affecting the look and how easy they are to use.

Traditional Flap (Housewife): This style has a simple overlapping flap of fabric on the open end. It’s clean-looking and secure, but the flap can sometimes get tucked inside when you’re putting the pillow in.
Oxford or Flanged: These have a decorative border (flange) around the open edge. They offer a more tailored, luxurious appearance and the flange helps hide the closure.
Zipper Closure: Less common for standard pillowcases, but sometimes used in decorative shams. It provides a very clean finish and completely encloses the pillow.

How to Measure Your King Pillow

If your pillow isn’t labeled or you’re unsure of its size, it’s easy to check. Grab a fabric measuring tape. Lay the pillow flat on your bed. Measure the width from one seam to the other across the short end. Then, measure the length from seam to seam along the long side. Write down these numbers. This is your pillow’s insert size. Your pillowcase should be very close to these dimensions, maybe an inch bigger for ease.

Fabric and “Hand” Considerations

The material of your pillowcase greatly impacts comfort. Here’s a quick rundown of popular choices:

Cotton (Percale or Sateen): Percale is crisp and cool, while sateen is silky and smooth. Both are breathable and durable. Look for a high thread count (like 300-600) for a softer feel.
Linen: Known for being incredibly breathable and getting softer with every wash. It has a distinctive, relaxed texture that’s great for temperature regulation.
Bamboo or Tencel™: These are often very soft, moisture-wicking, and have a slight cooling effect, which can be beneficial for hot sleepers.
Silk or Satin: These are smooth and can help reduce friction on hair and skin. Real silk is a premium option, while satin (often polyester) is a more affordable alternative.

Your choice depends on your personal preference for temperature, texture, and maintenance. For example, linen wrinkles easily but many people love its casual charm.

Step-by-Step Guide to Buying the Right King Pillowcases

Identify Your Pillow Size: Confirm if you have standard king (20″x36″) or California king (20″x40″) pillows. Measure them if you’re unsure.
Check Your Sheet Set: If you’re buying a replacement, see if your current sheet set includes pillowcases. Most king sheet sets come with two standard king pillowcases. This tells you what size you need.
Decide on a Closure Style: Choose between a traditional flap, oxford style, or another closure based on your aesthetic and practical preferences.
Select Your Fabric: Think about what feels best against your skin and suits your sleep habits (cooling, warm, crisp, soft).
Read Product Details Carefully: Before ordering, double-check the listed dimensions on the website or packaging. Don’t just rely on the title saying “king.”
Consider Buying Extras: It’s always handy to have a few spare pillowcases for easy changes between washes or for guest rooms.

Common Mistakes to Avoid

When shopping for king pillowcases, a few simple errors can lead to the wrong purchase. Here’s what to watch out for.

Assuming “King” is Universal: Always verify if it’s for a standard or California king bed. They are not interchangable.
Ignoring Pillow Loft: If you have an extra-plush or overfilled pillow, you might need a “deep pocket” pillowcase or one specifically labeled for high-loft pillows to acomodate the extra thickness.
Forgetting About Shams: Decorative shams are usually larger than standard pillowcases and are meant to go over them. Don’t try to use a sham as a regular pillowcase, as it will be too big and baggy.
Not Washing Before Use: New pillowcases can feel stiff. Always wash them before the first use to soften the fabric and remove any manufacturing residues.

Care and Maintenance for Longevity

Taking good care of your pillowcases keeps them looking and feeling nice for years. Follow the care label instructions first, but here are general tips.

Wash pillowcases regularly, at least once a week, to remove oils and skin cells.
Use a mild detergent and avoid excessive bleach, which can weaken fibers and cause yellowing over time.
Tumble dry on a low heat setting to prevent excessive wrinkling and shrinkage. Removing them while slightly damp can make ironing easier, if you choose to iron.
Store matching sets together so you don’t have to search for pieces when making the bed.

What to Do If Your Pillowcase is Slightly Too Big or Small

A slightly baggy pillowcase can be tucked in more firmly. If it’s consistently messy, you might try using pillow clips or bands inside the case to hold the pillow in place. For a case that’s just a little too small, you can try stretching the fabric gently when the pillow is inside. However, if it’s drastically the wrong size, it’s best to get the correct one for comfort and durability. A too-tight case will put constant stress on the seams.

FAQ Section

Q: Are king and queen pillowcases the same size?
A: No, they are not. A standard queen pillowcase is 20″ x 30″, while a standard king is 20″ x 36″. The king pillowcase is six inches longer.

Q: How many pillowcases come in a king sheet set?
A: Typically, a king sheet set includes two standard king pillowcases. Always check the product description to be certain, as some sets may include one or even none.

Q: Can I use a queen pillowcase on a king pillow?
A: You cannot. A queen pillowcase is too short for a king pillow. It will not fit properly and will likely tear at the seams if you force it.

Q: What is a Euro king pillowcase?
A: A Euro king or European king pillow is a large square, usually 26″ x 26″. It’s often used as a decorative backing pillow on a bed, not for sleeping. It requires its own specific square pillowcase size.

Q: Do I need special pillowcases for king size memory foam pillows?
A> Most king memory foam pillows are made to the standard 20″ x 36″ dimensions. However, some may be thicker. Check the pillow’s specs; if it’s a standard size, a standard king case will work. If it’s extra thick, look for “deep pocket” cases.

Knowing the answer to “what size is a king size pillowcase” makes shopping for bedding much simpler. Remember the key measurement of 20 by 36 inches for a standard king, and always double-check for California king variations. With the right fit and fabric, you can ensure your pillows are protected and your bed looks perfectly put together. A little attention to these details goes a long way in creating a comfortable and inviting sleep space.