What Size Is a King Pillowcase?

Understanding King Pillowcase Dimensions

A king pillowcase measures 20 x 40 inches (51 x 102 cm). This dimension accommodates a standard king pillow perfectly. The pillowcase provides adequate coverage for the pillow while allowing room for the pillow to move without bunching.

King pillowcases differ from standard sizes. A standard pillowcase measures 20 x 26 inches. A queen pillowcase measures 20 x 30 inches. The king size offers 10-14 inches more length than these alternatives.

Manufacturers produce king pillowcases in these standard measurements. Slight variations exist between brands. Some brands add 1-2 inches to accommodate pillow thickness. Always verify exact dimensions before purchase.

The Evolution of King Pillowcase Sizing

Early Bedding Standards

Pillow sizes became standardized in the early 20th century. Before standardization, people made pillows in various dimensions. Families created custom pillowcases for each pillow they owned.

The mattress industry introduced king-size beds in the 1950s. King beds measured 76 x 80 inches. This new bed size required larger pillows. Manufacturers responded by creating king pillows and corresponding pillowcases.

Modern Sizing Conventions

The bedding industry established official size categories by the 1960s. These categories included standard, queen, and king dimensions. The 20 x 40-inch king pillowcase became the industry standard.

European countries adopted different sizing systems. European king pillowcases often measure 50 x 90 cm (approximately 20 x 35 inches). American king sizes remain larger than most international equivalents.

Types of King Pillowcases

Standard King Pillowcases

Standard king pillowcases fit regular king pillows. These pillows measure 20 x 36 inches. The 20 x 40-inch case provides 2 inches of extra length on each end. This extra space prevents the pillow from stretching the fabric.

Standard king pillowcases work for:

• Sleeping pillows
• Decorative shams
• Body pillows (when cut to king pillow size)
• Euro pillows placed horizontally

Body Pillowcases

Body pillowcases measure 20 x 54 inches. These cases accommodate full-length body pillows. Body pillows provide support for side sleepers and pregnant individuals.

Body pillowcases differ from king pillowcases in length only. The width remains consistent at 20 inches. Some shoppers confuse body pillowcases with king sizes due to the shared width.

Euro Sham Sizing

Euro shams measure 26 x 26 inches square. These decorative pillowcases sit upright against headboards. Euro shams do not fit king pillows. The square shape differs from the rectangular king pillow design.

King Pillowcase Size Comparison

Pillowcase Type	Width (inches)	Length (inches)	Width (cm)	Length (cm)	Best For
Standard	20	26	51	66	Single sleepers, children
Queen	20	30	51	76	Queen beds, most adults
King	20	40	51	102	King beds, side sleepers
Body Pillow	20	54	51	137	Pregnancy, full-body support
Euro Sham	26	26	66	66	Decorative use only

How to Measure Your Pillow for the Right Pillowcase

Step-by-Step Measurement Process

1. Lay the pillow flat on a hard surface
2. Measure the width from seam to seam across the shorter side
3. Measure the length from seam to seam across the longer side
4. Add 4 inches to the length for proper fit
5. Record measurements and compare to standard sizes

Accounting for Pillow Loft

Pillow loft affects pillowcase fit. Loft refers to the height or thickness of a pillow. High-loft pillows require more fabric to cover properly.

Down and down-alternative pillows compress easily. These pillows fit standard king pillowcases without issue. Memory foam and latex pillows maintain their loft. These materials may require pillowcases with extra room.

Pillow Fill and Sizing Considerations

Different pillow fills affect how pillowcases fit:

• Down fill: Compresses significantly, fits snugly
• Feather fill: Moderate compression, standard fit
• Memory foam: Minimal compression, may feel tight
• Latex: No compression, requires exact sizing
• Polyester fill: Varies by density and quality

Materials Used for King Pillowcases

Cotton Pillowcases

Cotton remains the most popular pillowcase material. Cotton pillowcases offer breathability and durability. Thread counts range from 200 to 1000 threads per square inch.

Egyptian cotton provides superior softness. Pima cotton offers excellent durability. Upland cotton costs less but provides adequate quality for most users.

Linen Pillowcases

Linen pillowcases provide exceptional temperature regulation. Linen fibers wick moisture away from skin. This material works well for hot sleepers.

Linen feels crisp initially. The fabric softens with each wash. Linen pillowcases last for decades with proper care.

Silk and Satin Pillowcases

Silk pillowcases reduce friction on hair and skin. This material prevents sleep wrinkles and hair breakage. Mulberry silk offers the highest quality.

Satin pillowcases mimic silk properties at lower costs. Satin refers to the weave pattern, not the material. Polyester satin provides a silk-like feel without the expense.

Microfiber Pillowcases

Microfiber consists of ultra-fine synthetic fibers. These pillowcases resist wrinkles and stains. Microfiber costs less than natural materials.

Microfiber pillowcases dry quickly after washing. This material works well for children’s bedding. The synthetic fibers may trap heat during sleep.

Thread Count and Weave Patterns

Understanding Thread Count

Thread count measures the number of threads per square inch of fabric. Higher thread counts generally indicate softer fabrics. The range spans from 180 to 1000 threads per square inch.

Thread counts between 300 and 500 provide the best balance. Counts above 600 may use thinner threads that break easily. Manufacturers sometimes manipulate thread count by using multi-ply yarns.

Common Weave Patterns

Weave patterns affect pillowcase feel and durability:

• Percale weave: Crisp, cool feel with matte finish
• Sateen weave: Smooth, lustrous surface with slight sheen
• Jersey knit: Stretchy, soft texture similar to t-shirts
• Flannel weave: Brushed surface for warmth
• Twill weave: Diagonal pattern offering durability

Closure Types for King Pillowcases

Envelope Closure

Envelope closures feature overlapping fabric at the opening. This design keeps pillows secure without additional hardware. The overlap measures 4-6 inches typically.

Envelope closures work well for all pillow types. The design prevents pillows from slipping out during sleep. No buttons or zippers create uncomfortable pressure points.

Zipper Closure

Zipper closures provide complete enclosure of the pillow. Zippers prevent pillow shifting and maintain a neat appearance. This closure type suits decorative shams best.

Zippers may break or snag with frequent use. Hidden zippers eliminate visible hardware. Some sleepers find zipper pulls uncomfortable against their face.

Button Closure

Button closures offer adjustable security. Buttons allow for partial opening during pillow insertion. This closure type appears primarily on decorative pillowcases.

Buttons may pop off during washing. Replace missing buttons promptly to maintain pillow security. Button closures take longer to open and close than other types.

Open-End Design

Open-end pillowcases feature no closure mechanism. The pillow slides into the case freely. This traditional design remains popular for everyday use.

Open-end cases require adequate length to prevent pillow escape. The pillow should extend to the end seam plus 2-4 inches. This extra length keeps the pillow secure during movement.

Matching King Pillowcases to Bed Sizes

King Bed Configurations

A standard king bed measures 76 x 80 inches. This bed size accommodates two king pillows side by side. Each pillow fits within a 38-inch width space.

California king beds measure 72 x 84 inches. Despite the narrower width, California king beds still use standard king pillowcases. The pillow size remains consistent across both king bed types.

Split King Beds

Split king beds consist of two twin XL mattresses. Each mattress measures 38 x 80 inches. Split king configurations allow independent movement for each sleeper.

Split king beds may use:

• Two king pillows (one per side)
• Four queen pillows (two per side)
• Four standard pillows (two per side)

The 20 x 40-inch king pillowcase fits all these arrangements.

Decorative Arrangements Using King Pillowcases

Hotel-Style Pillow Arrangement

Hotels typically use four to six pillows on king beds. The arrangement includes:

1. Two king sleeping pillows against the headboard
2. Two standard decorative shams in front of sleeping pillows
3. One to two accent pillows at the front

This layered approach creates visual depth. Remove decorative pillows before sleep.

Minimalist Pillow Setup

Minimalist arrangements use two to three pillows total. This setup includes:

• Two king pillows for sleeping
• One small accent pillow (optional)

Minimalist arrangements reduce clutter. Fewer pillows mean less time making the bed each morning.

Shopping for King Pillowcases

Where to Buy

King pillowcases are available at:

• Department stores
• Bedding specialty retailers
• Online marketplaces
• Direct-to-consumer brands like lululinens.com
• Home goods stores

Online shopping offers broader selection. Physical stores allow you to feel fabric quality before purchase.

Price Ranges

King pillowcase prices vary significantly:

• Budget options: $10-25 per pair
• Mid-range options: $25-60 per pair
• Premium options: $60-150 per pair
• Luxury options: $150+ per pair

Higher prices reflect better materials and construction. Budget options work well for guest rooms or children’s beds.

Set vs. Individual Purchase

Pillowcases come in sets or individually. Standard sets include:

• Two king pillowcases
• One flat sheet
• One fitted sheet

Purchasing sets ensures matching patterns and colors. Individual pillowcases allow for mix-and-match styling.

Color and Pattern Selection

Choose colors that complement your bedroom:

• Neutral colors: White, beige, gray work with any decor
• Bold colors: Navy, emerald, burgundy create focal points
• Patterns: Stripes, florals, geometric designs add visual interest

Darker colors hide stains better. Lighter colors create an airy feel.

Care Instructions for King Pillowcases

Washing Frequency

Wash king pillowcases every one to two weeks. More frequent washing benefits:

• People with allergies
• Individuals with oily skin
• Those who sweat heavily during sleep

Use a hot water cycle for white pillowcases. Wash colored pillowcases in warm or cold water to prevent fading.

Detergent Selection

Choose detergents based on fabric type:

• Cotton: Standard liquid or powder detergent
• Linen: Mild detergent without brighteners
• Silk: Specialized silk detergent or gentle shampoo
• Microfiber: Liquid detergent without fabric softener

Avoid using excessive detergent. Excess soap leaves residue on fabrics.

Drying Methods

Different materials require specific drying methods:

• Cotton: Tumble dry on medium heat
• Linen: Air dry or tumble dry on low
• Silk: Air dry flat away from sunlight
• Microfiber: Tumble dry on low heat

Remove pillowcases promptly from the dryer. This practice reduces wrinkles and maintains fabric quality.

Stain Removal Tips

Common pillow stains include:

• Sweat stains: Treat with white vinegar before washing
• Makeup stains: Apply dish soap directly to stain
• Drool marks: Soak in cold water with enzyme detergent
• Oil stains: Sprinkle with cornstarch, let sit, then wash

Always treat stains before washing. Heat from the dryer sets stains permanently.

Common Problems and Solutions

Pillowcase Too Large

If your king pillowcase feels too large:

• Check that you have a king pillow, not queen size
• Add more pillow fill to increase loft
• Use a fabric tie to gather excess material at the opening
• Exchange for proper size if measurement error occurred

Pillowcase Too Small

If your king pillowcase feels too tight:

• Verify pillow dimensions match king size specifications
• Consider a body pillowcase for oversized pillows
• Check for shrinkage from improper washing
• Some high-loft pillows require custom cases

Pilling and Wear

Fabric pills form from friction during use. Reduce pilling by:

• Washing inside out
• Using a fabric shaver to remove existing pills
• Avoiding over-drying in the dryer
• Choosing higher-quality materials

Color Fading

Prevent premature fading through:

• Washing in cold water
• Using color-safe detergent
• Drying away from direct sunlight
• Turning pillowcases inside out before washing

Environmental Considerations

Sustainable Materials

Organic cotton eliminates pesticide use during growing. This material costs more but reduces environmental impact. GOTS certification ensures organic standards.

Bamboo fabric grows quickly without pesticides. Bamboo requires less water than cotton. The manufacturing process affects overall sustainability.

Recycled polyester uses plastic bottles as raw material. This option diverts waste from landfills. The fabric performs similarly to virgin polyester.

Longevity and Waste Reduction

Quality king pillowcases last five to ten years. Proper care extends this lifespan. Replace pillowcases showing:

• Permanent stains
• Holes or tears
• Significant thinning
• Loss of structural integrity

Donate usable pillowcases to shelters. Repurpose worn pillowcases as cleaning rags.

Selecting the Right King Pillowcase: Decision Framework

Step 1: Verify Pillow Dimensions

Measure your pillow accurately. Confirm it measures approximately 20 x 36 inches. This size requires a 20 x 40-inch king pillowcase.

Step 2: Assess Sleep Preferences

Consider your sleep habits:

• Hot sleepers need breathable materials like cotton or linen
• Cold sleepers prefer flannel or microfiber
• Sensitive skin benefits from silk or high-thread-count cotton
• Allergy sufferers need hypoallergenic, frequently washable options

Step 3: Determine Budget

Set a realistic budget before shopping. Factor in:

• Cost per pillowcase
• Number of sets needed
• Replacement frequency
• Care and maintenance expenses

Step 4: Select Material and Construction

Choose fabric based on priorities:

• Durability: Cotton or linen
• Luxury feel: Silk or high-thread-count Egyptian cotton
• Easy care: Microfiber or cotton-polyester blend
• Temperature regulation: Linen or percale cotton

Step 5: Choose Closure Type

Select closure based on usage:

• Sleeping pillows: Envelope or open-end
• Decorative pillows: Zipper or button closure
• Frequent washing: Envelope closure (no hardware to break)

Step 6: Consider Aesthetic Preferences

Match pillowcases to bedroom decor. Consider:

• Color scheme
• Pattern preference
• Texture variation
• Seasonal rotation

Summary

A king pillowcase measures 20 x 40 inches. This standard size accommodates king pillows measuring 20 x 36 inches. The extra length prevents pillow escape and fabric stretching.

King pillowcases come in various materials. Cotton provides breathability and durability. Linen offers temperature regulation. Silk reduces friction on hair and skin. Microfiber delivers affordability and easy care.

Proper measurement ensures correct fit. Lay pillows flat and measure from seam to seam. Add 4 inches to length for comfortable coverage. Consider pillow loft and fill type during selection.

Care practices extend pillowcase life. Wash every one to two weeks in appropriate water temperature. Use suitable detergent for fabric type. Dry according to material specifications. Treat stains promptly before washing.

Select king pillowcases based on sleep preferences, budget, and aesthetic goals. Quality pillowcases from retailers like lululinens.com last for years with proper care. The right king pillowcase enhances sleep comfort and bedroom appearance.