How to Choose the Right Pillow Cover Size
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Introduction
Choosing the right pillow cover size seems simple—until you realize your new covers don’t fit. Too small? You’ll wrestle with the zipper. Too large? Your pillows look saggy and sad.
The good news: there’s a standard sizing system for pillow covers. This guide covers everything from measurements to pro tips for a perfect, hotel-worthy look.
Standard Pillow Cover Sizes
Sofa throw pillows usually come in three main sizes. Here’s what you’ll find at HOSTECCO:
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16" × 16" (40 × 40 cm)
- Best for small accent pillows and tight spaces
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18" × 18" (45 × 45 cm)
- Most popular – standard sofa pillows
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20" × 20" (50 × 50 cm)
- Large statement pillows, floor cushions
Note: 18 inches = 45.7 cm, but retailers round to 45 cm for simplicity.
How to Measure Your Pillow for the Perfect Fit
Follow these steps to get it right the first time:
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Measure the pillow insert
- Lay your pillow flat and measure edge to edge.
- Don’t measure the old cover—measure the insert itself.
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Check the elasticity
- Non-elastic pillows: Choose a cover 1–2 inches larger than the insert.
- Elastic/down pillows: Same size or 1–2 inches smaller works fine.
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Account for pillow protectors
- If you use a protector, measure with it on.
- Add an extra inch to your cover size if needed.
Quick Reference: What Size Cover Do I Need?
- 16" × 16" (40×40 cm) insert → 18" × 18" cover for a fuller look
- 18" × 18" (45×45 cm) insert → 18" × 18" cover (snug) or 20" × 20" cover (relaxed)
- 20" × 20" (50×50 cm) insert → 20" × 20" cover (fitted) or 22" × 22" cover (oversized)
Common Mistakes to Avoid
❌ Measuring the old cover – Fabric stretches over time; always measure the insert
❌ Ignoring pillow thickness – Thick, fluffy pillows need larger covers
❌ Forgetting about shrinkage – Cotton and linen may shrink after washing
❌ Buying exact size for non-elastic pillows – You’ll struggle to get them in
Pro Tips from HOSTECCO
For a tailored, high-end look:
- Choose a cover 1 inch smaller than a very elastic insert
- Tension creates a smooth, wrinkle-free surface
For a relaxed, cozy vibe:
- Size up 2 inches for a softer, more casual drape
Mixing sizes on your sofa:
- Corners: 20" pillows
- Front layer: 18" pillows
- Accent: One 16" pillow for visual interest
Frequently Asked Questions
Q: What is the most common pillow cover size?
A: 18" × 18" (45 × 45 cm) is the standard size for sofa throw pillows. It fits most inserts and works in almost any space.
Q: Should pillow covers be bigger than the insert?
A: It depends. Non-elastic inserts: go 1–2 inches larger. Elastic/down-filled inserts: same size or slightly smaller for a fuller look.
Q: How do I know if my pillow is elastic?
A: Squeeze it. If it springs back quickly and feels firm → non-elastic (polyester fill). If it compresses easily and feels soft → elastic (down or down-alternative).
Q: Can I use a 20" cover on an 18" pillow?
A: Yes, for a loose, casual “lived-in” look. For a crisp, tailored style, stick closer to the insert size.
Q: What's the best size for a sectional sofa?
A: Bigger is better—20" × 20" or 22" × 22". Large furniture needs large pillows to look proportional.
Q: Do pillow covers shrink?
A: Natural fibers like cotton and linen can shrink 5–10% after washing. Polyester and short plush fabrics are more stable. Always check care labels.
Conclusion
Getting the right pillow cover size is all about knowing your insert and choosing the fit that matches your style. When in doubt, 18" × 18" is the safest choice—the universal standard that works almost everywhere.
Ready to shop?
Browse HOSTECCO’s pillow cover collection → in sizes from 16" to 20".