What Is the Size of a King Size Pillowcase?

Standard King Size Pillowcase Dimensions

A king size pillowcase measures 20 x 40 inches (51 x 102 cm) in most cases. This dimension fits a standard king pillow perfectly. The pillowcase provides coverage for the entire pillow surface plus a few extra inches for tucking and closure.

Manufacturers design king pillowcases with specific measurements that match standard king pillows. The 20-inch width accommodates the pillow’s height. The 40-inch length covers the pillow’s full length with room for the opening.

Some brands add 2-4 inches to the length for envelope closures or French back designs. These extra inches prevent the pillow from slipping out during sleep.

King vs. Standard Pillowcase Measurements

The difference between king and standard pillowcases is significant:

• Standard pillowcase: 20 x 26 inches
• King pillowcase: 20 x 40 inches
• Queen pillowcase: 20 x 30 inches

King pillowcases are 14 inches longer than standard sizes. This extra length is essential for proper fit. Using a standard pillowcase on a king pillow creates bunching and discomfort.

The History of King Size Bedding

King size bedding emerged in the United States during the 1950s. Post-war prosperity led to larger homes with bigger bedrooms. Mattress manufacturers responded by creating larger bed sizes.

The California king appeared first in the late 1950s. Standard king beds followed shortly after. Bedding manufacturers then developed corresponding pillowcase sizes.

Before standardization, pillowcase sizes varied widely between manufacturers. The bedding industry established size standards in the 1960s. This standardization helped consumers purchase matching sets with confidence.

European markets adopted different sizing conventions. European king pillowcases often measure 50 x 90 cm (approximately 20 x 35 inches). These differences persist today across international markets.

Types of King Pillowcases

Standard King Pillowcases

Standard king pillowcases are the most common type. They measure 20 x 40 inches and fit regular king pillows. These pillowcases work well for most sleeping positions.

Body Pillow Covers

Body pillows are longer than king pillows. Body pillow covers typically measure 20 x 54 inches. These are not interchangeable with standard king pillowcases.

European King Pillowcases

European sizing differs from American standards. European king pillowcases measure approximately 26 x 26 inches (65 x 65 cm). These square pillowcases suit continental sleeping preferences.

Material Options for King Pillowcases

Different materials offer distinct benefits:

Cotton: Breathable, durable, and easy to wash. Cotton pillowcases are the most popular choice. Thread counts range from 200 to 1000.

Percale: A cotton weave with a crisp, cool feel. Percale king pillowcases have a matte finish. They are excellent for hot sleepers.

Sateen: A cotton weave with a silky, smooth surface. Sateen pillowcases have a subtle sheen. They feel softer but may trap more heat.

Linen: Made from flax fibers. Linen king pillowcases are highly breathable. They soften with each wash and regulate temperature well.

Silk: Luxurious and smooth. Silk pillowcases reduce friction on hair and skin. They require delicate care.

Microfiber: Synthetic polyester fibers. Microfiber pillowcases are affordable and wrinkle-resistant. They dry quickly but may not breathe as well.

Bamboo: Made from bamboo-derived rayon. These pillowcases are soft and moisture-wicking. They offer natural antimicrobial properties.

Thread Count and Quality Indicators

Thread count refers to the number of threads per square inch of fabric. Higher thread counts generally indicate softer, more durable fabric.

Quality thread count ranges:

• 200-400: Good everyday quality
• 400-600: High quality, very comfortable
• 600-800: Premium quality, luxurious feel
• 800+: Ultra-premium, though benefits plateau

Thread count alone does not determine quality. Fiber quality, weave type, and finishing processes also matter. A 400-thread-count Egyptian cotton pillowcase often outperforms a 1000-thread-count synthetic blend.

Closure Types for King Pillowcases

Housewife Closure

The most basic closure type. The pillowcase has a simple open end. The pillow tucks inside with no additional flap. This design is easy to use and wash.

Oxford Edge

Features a decorative flat border around the opening. The border typically measures 2-5 inches wide. Oxford edges add a formal, finished look.

Envelope Closure

Includes an internal flap that overlaps inside the pillowcase. The flap keeps the pillow secure during sleep. This closure type prevents the pillow from sliding out.

Zipper Closure

Uses a zipper to seal the pillowcase completely. Zipper closures provide the most secure fit. They work well for decorative or allergy-protective purposes.

Button Closure

Features buttons along the opening edge. Button closures offer a decorative element. They provide moderate security for the pillow.

Benefits of Proper Pillowcase Sizing

Using correctly sized pillowcases provides several advantages:

Comfort: Proper fit eliminates bunching and wrinkles. The fabric stays smooth throughout the night.

Appearance: Well-fitted pillowcases look neat and intentional. They enhance bedroom aesthetics.

Durability: Correct sizing reduces stress on seams. This extends the pillowcase’s lifespan.

Hygiene: Properly fitted pillowcases are easier to wash and replace regularly. They maintain better cleanliness.

Sleep Quality: Smooth, well-fitted pillowcases reduce nighttime friction. This improves overall sleep comfort.

How to Measure Your Pillow for Pillowcases

Follow these steps to measure your pillow accurately:

1. Lay the pillow flat on a hard surface
2. Measure the width from left to right edge (should be approximately 20 inches)
3. Measure the length from top to bottom edge (should be approximately 36-40 inches for king)
4. Add 2-4 inches to each measurement for comfort and closure
5. Compare your measurements to standard pillowcase sizes

If your pillow measures 20 x 36 inches, a standard 20 x 40-inch king pillowcase fits well. The extra inches accommodate the pillow’s loft and closure needs.

Common Sizing Issues and Solutions

Pillowcase Too Small

A pillowcase that is too small creates several problems:

• Pillow corners poke through the fabric
• Seams strain and may tear
• Fabric pulls tightly and feels uncomfortable
• Pillow slides out easily

Solution: Purchase the correct size or opt for slightly larger pillowcases with envelope closures.

Pillowcase Too Large

Oversized pillowcases cause different issues:

• Excess fabric bunches under the head
• Pillow shifts inside the case
• Appearance looks sloppy
• Fabric wrinkles excessively

Solution: Use safety pins to temporarily secure the excess fabric, or purchase the proper size.

King Pillowcase Size Comparison Chart

Pillow Type	Width (inches)	Length (inches)	Best Use
Standard	20	26	Single/twin beds
Queen	20	30	Queen beds
King	20	40	King beds
Body Pillow	20	54	Side sleepers
European	26	26	Decorative

Washing and Care Instructions

Proper care extends the life of king size pillowcases:

Cotton and Linen:

• Wash in warm or hot water
• Use mild detergent
• Tumble dry on medium heat
• Iron if desired for crisp appearance

Silk:

• Hand wash or use delicate cycle
• Use cold water only
• Air dry flat
• Never use bleach

Microfiber and Synthetic Blends:

• Wash in warm water
• Avoid fabric softener (reduces moisture-wicking properties)
• Tumble dry on low heat
• Remove promptly to prevent wrinkles

General Tips:

• Wash pillowcases weekly
• Separate colors from whites
• Zip or button closures before washing
• Avoid overloading the washing machine

Selecting the Right King Pillowcase

Consider these factors when purchasing king pillowcases:

Sleep Temperature: Hot sleepers benefit from percale cotton or linen. Cold sleepers prefer sateen or flannel.

Skin Sensitivity: Silk and bamboo reduce friction. They minimize skin irritation and hair breakage.

Budget: Cotton percale offers excellent value. Microfiber provides affordable options.

Maintenance: Synthetic blends require less ironing. Natural fibers need more care but last longer.

Aesthetic Preferences: Choose colors and patterns that match your bedroom décor. Solid colors are versatile and timeless.

How Many King Pillowcases Do You Need?

Sleep experts recommend owning at least two to three sets of pillowcases per pillow. This allows for regular washing and rotation.

A typical setup includes:

• 2 sets for regular use and rotation
• 1 backup set for emergencies or guests
• Additional decorative pillowcases as desired

Rotating pillowcases reduces wear and extends the life of each set. Having backup sets ensures you always have clean pillowcases available.

Where to Buy Quality King Pillowcases

Quality king pillowcases are available from various sources:

Department Stores: Offer mid-range options with good selection. Brands vary in quality and price.

Online Marketplaces: Provide wide selection and competitive pricing. Read customer reviews carefully.

Direct-to-Consumer Brands: Often offer premium quality at lower prices. These companies eliminate middleman markups.

Investment Value of Quality Pillowcases

Premium king pillowcases cost more initially but provide better value over time. High-quality pillowcases last 3-5 years with proper care. Budget options may need replacement every 1-2 years.

Calculate cost per use:

• Premium pillowcase: $40 ÷ 1,500 nights = $0.027 per night
• Budget pillowcase: $15 ÷ 500 nights = $0.03 per night

Quality pillowcases also improve sleep comfort and reduce skin irritation. These benefits justify the higher initial investment.

Final Selection Steps

Follow this process to choose the perfect king size pillowcase:

1. Measure your pillow dimensions accurately
2. Determine your preferred material based on sleep temperature and sensitivity
3. Select desired thread count within your budget
4. Choose closure type based on security needs
5. Pick colors or patterns that match your bedroom
6. Purchase 2-3 sets for rotation
7. Wash before first use
8. Establish a weekly washing routine

King size pillowcases measure 20 x 40 inches as standard. This size accommodates king pillows perfectly. Choosing the right material, thread count, and closure type enhances comfort and durability. Regular care and proper sizing ensure years of comfortable sleep. Quality pillowcases represent a worthwhile investment in better rest and bedroom aesthetics.