You’re looking to buy new bedding, and you need to know what are the measurements of a king size pillow case. Getting the right fit is crucial for a neat, comfortable look on your bed. This guide will give you all the details, from standard sizes to special variations, so you can shop with total confidence.
A king size pillow case is designed to fit a king size pillow, which is notably larger than standard or queen options. Using the correct case prevents your pillow from slipping out and keeps your bedding looking crisp. Let’s break down the exact numbers you need to know.
What Are The Measurements Of A King Size Pillow Case
The standard measurements for a king size pillow case in the United States are 20 inches by 36 inches. This is often written as 20″ x 36″. The first number (20″) is the width, and the second number (36″) is the length. This size is made to snugly fit a king pillow insert of the same dimensions.
It’s important to remember that these are the finished measurements. The actual fabric piece cut to make the case will be larger to account for seams and the pillow closure. When you lay a king pillow case flat, it should measure 20 inches across and 36 inches long.
Why the Exact Fit Matters
A perfect fit isn’t just about looks. A case that’s too big will look baggy and wrinkled, and your pillow can shift around inside. If it’s too small, you’ll struggle to get the pillow in, and the fabric will be stretched tight. This can damage the seams and make the pillow feel overly firm.
For a plush, hotel-style finish, some people prefer a slightly tighter fit. Others like a bit of extra room, especially for down or feather pillows that can be compressed. Knowing the standard is your starting point for these preferences.
King vs. Standard Pillow Case Sizes
It’s easy to get pillow sizes mixed up. Here’s a quick comparison:
- Standard Pillow Case: 20″ x 26″. Fits twin or full beds, often used in pairs.
- Queen Pillow Case: 20″ x 30″. A common size for queen beds.
- King Pillow Case: 20″ x 36″. The longest of the common sizes, made for king and California king beds.
Notice the width is consistently 20 inches for all three. The only difference is the length. This is why you can sometimes use a standard pillow on a king bed for decorative purposes, but a king pillow will never fit properly into a smaller case.
What About Pillow Sham Sizes?
Shams are decorative covers that usually have a flange (a decorative border). A king size sham will typically have the same interior dimensions as a pillow case—20″ x 36″—but the overall fabric piece is larger to create that decorative edge. Always check the “insert size” listing when buying shams.
International Variations to Consider
If you’re shopping from brands outside the U.S., or own imported bedding, sizes can differ. The UK and Australian “king size” is often different from the American king.
- UK/Australian King: Often closer to 20″ x 40″ or even 20″ x 42″. This is longer than the US version.
- European King: Can vary widely, but 50 x 80 cm (about 19.5″ x 31.5″) is a common size, which is actually closer to a US Queen.
Always double-check the product description for exact inch or centimeter measurements. Don’t rely solely on the name “king size.”
Specialty King Pillow Case Measurements
Beyond the standard king, you’ll find some speciality options. These cater to specific pillow types or aesthetic preferences.
King Size Pillow Cases for Euro Pillows
Euro pillows are large square pillows used for decoration and back support. A Euro pillow case is square, not rectangular. The standard size for a king Euro pillow is 26″ x 26″. Sometimes you might see a “Large Euro” at 28″ x 28″. These are not interchangeable with standard king pillow cases.
Oxford vs. Housewife Pillow Case Styles
The style of the case also affects how it fits, even if the interior dimensions are the same.
- Housewife Style: This is a simple, envelope-style case with no border. It fits the pillow most closely to its stated measurements (20″ x 36″).
- Oxford Style: This case has a decorative, hemmed border all the way around the opening. It gives a more formal look. The border adds extra fabric, so the case may look slightly larger on the pillow, but the pocket for the insert remains 20″ x 36″.
Cases for Oversized or Plush Pillows
Some modern king pillows are sold as “oversized” or “plush.” They may measure 21″ x 37″ or even larger. For these, you need to seek out specifically labeled “oversized king” pillow cases. Trying to force a thicker pillow into a standard case can cause seems to burst.
How to Measure Your Pillow for the Perfect Case
If your pillow is old, homemade, or non-standard, it’s best to measure it yourself. Here’s a simple step-by-step guide:
- Lay your pillow flat on a bed or table. Smooth out any major lumps.
- Measure the Width: Use a fabric tape measure. Place it at the widest part of the pillow, from one seam to the opposite seam. This is usually the shorter side. Note the number in inches.
- Measure the Length: Measure from the seam at one end to the seam at the other end along the longer side.
- Measure the Depth (Thickness): This is often overlooked! Measure how thick the pillow is from front to back when it’s lying down. A slim pillow might be 4″ thick, while a plush down pillow could be 8″ or more.
Now you have your pillow’s true dimensions: Width x Length x Depth. When shopping, match the width and length first. If your pillow is very thick, consider sizing up or looking for cases made for “high loft” pillows.
What If My Pillow is Between Sizes?
Pillows can compress over time. If your king pillow measures 19.5″ x 35.5″, a standard 20″ x 36″ case will still fit fine. If it’s significantly smaller, the case will be baggy. If it’s bigger, go for an oversized option. Some brands now offer “relaxed fit” king cases for a looser, more casual look.
Material and Shrinkage: A Key Factor
Fabric choice directly impacts the final fit of your pillow case. Natural fibers like cotton, especially 100% cotton, are prone to shrinkage.
Accounting for Wash Shrinkage
A new pillow case that fits perfectly on day one might be too tight after its first wash. Most quality manufacturers “pre-shrink” their fabrics, but some shrinkage is still possible, typically 2-5%. To be safe:
- Check the care label for shrinkage information.
- Wash and dry the case before judging the fit, if possible.
- Consider buying cases made from cotton-polyester blends or linen, which tend to shrink less than pure cotton.
If you’re sewing your own cases, it’s critical to pre-wash and dry your fabric before cutting and sewing. This ensures your finished project won’t shrink out of fit later.
Buying Guide: Choosing the Right King Pillow Case
With the measurements clear, here’s what else to look for when you shop.
Closure Types
How the case closes affects its look and function.
- Envelope Closure: A simple overlapping flap of fabric. It hides the pillow well and is secure.
- Zipper Closure: Provides a very clean, hidden look and is excellent for keeping pillow inserts in place.
- Button Closure: Less common, offers a decorative touch.
- Open End: Rare for king sizes, as the pillow can easily fall out.
Thread Count and Weave
Thread count refers to the number of threads per square inch. A range of 200-400 is generally good for breathability and softness. Higher isn’t always better. Also pay attention to weave:
- Percale: Crisp, cool, and breathable. Has a matte finish.
- Sateen: Smooth, lustrous, and slightly warmer. Feels silky.
Matching Your Bedding Set
King beds often use two king pillows, or a combination of king and standard pillows. Know what your comforter set includes. A “king bedding set” usually comes with two king pillow cases. If you need more, you might have to buy them separately.
Care and Maintenance for Longevity
Taking good care of your pillow cases keeps them fitting well and looking new longer.
- Wash them regularly, at least once a week, to remove oils and skin cells.
- Follow the care label instructions. Use mild detergent and avoid excessive bleach.
- Tumble dry on a low heat setting to prevent excessive shrinkage and damage to fibers.
- Iron if desired, while the fabric is still slightly damp, for a crisp finish.
Rotating between two or three sets of cases reduces wear and tear on any single set. This is a simple way to extend the life of your linens.
DIY: Sewing Your Own King Pillow Case
If you sew, making a pillow case is a simple project. Here’s the basic math for a standard housewife style with an envelope closure:
- Fabric Cut Dimensions: You’ll need one main piece. Width = (20″ + 1″ for seam allowance) = 21″. Length = (36″ x 2) + 10″ for the envelope flap + 1″ for seam allowance = 83″. So, cut one piece 21″ wide by 83″ long.
- Fold the fabric, sew the side seam, and create the envelope flap. There are many excellent tutorials online with detailed pictures.
- This allows you to choose any fabric you love and ensure a perfect fit for non-standard pillows.
Common Sizing Mistakes to Avoid
Even with the right measurements, people make errors.
- Ignoring Pillow Thickness: A thick pillow needs a case with depth allowance.
- Mixing Metric and Imperial: Be consistent. Don’t measure your pillow in inches and then buy a case listed in centimeters without converting.
- Forgetting about Shrinkage: As mentioned, always anticipate a little shrinkage in natural fibers.
FAQ Section
How big is a king size pillow case?
A standard U.S. king size pillow case is 20 inches wide and 36 inches long (20″ x 36″).
Is a king pillow case the same as a California king?
Yes, typically. Both standard king and California king beds use the same 20″ x 36″ pillow size. The difference between the beds is in the mattress width and length, not the pillow size.
What size is a king pillow case in cm?
Approximately 51 cm x 91 cm. For exact sizing, always check the product details, as European sizes can differ.
How many king pillow cases come in a set?
A standard king-size sheet set usually includes two king pillow cases. Comforter sets may also include two, but it’s best to check the contents list before you buy.
Can I put a king pillow in a queen case?
No, you cannot. A queen case is 20″ x 30″, which is 6 inches shorter than a king pillow. It will be far to small and likely damage the seams of the case or the pillow itself.
Why does my new king pillow case feel tight?
Two likely reasons: First, your pillow might be an “oversized” king. Second, the fabric may not have been pre-shrunk and could loosen slightly after a few washes. The tightness could also be due to a high thread count sateen weave, which has less stretch than percale.
Knowing the precise answer to ‘what are the measurements of a king size pillow case’—20 by 36 inches—saves you time, money, and frustration. It ensures your bedroom looks polished and your pillows feel just right. Whether you’re replacing old cases, buying for a new bed, or starting a sewing project, this fundamental measurement is the key to a perfect fit. Always remember to account for material, shrinkage, and your specific pillow’s plumpness to get the best possible result.