Finding the right size pillow cover for an 18×18 pillow is a common question. Getting the fit correct makes all the difference in how your pillow looks and feels. A cover that’s too tight will look strained, while one that’s too loose will appear sloppy. This guide will walk you through everything you need to know to choose perfectly.
We’ll cover the simple answer, the details of different fit styles, and how to measure. You’ll also learn about fabric choices and care tips. By the end, you’ll be confident selecting the ideal cover for your 18-inch pillow insert.
What Size Pillow Cover For 18×18 Pillow
The direct answer is simple: for a standard, comfortable fit, you need an 18×18 inch pillow cover. This is known as a “finished size.” It means the cover is designed to fit an 18-inch pillow insert snugly. However, this isn’t the only option available to you.
Your choice depends on the look you want. Designers often use different cover sizes to achieve different styles. The three main fit types are standard fit, snug fit, and relaxed fit. Understanding these will help you get the exact aesthetic you’re aiming for.
Understanding Pillow Cover Fit Styles
Not all 18×18 covers are created equal. The cut of the fabric and the seam allowance determine the final fit. Here’s a breakdown of the three common styles.
1. Standard Fit (18×18 Cover)
This is the most common and recommended choice. An 18×18 cover is designed for an 18×18 insert. It provides a full, plump appearance without being overstuffed. The corners meet neatly, and the cover lays flat against the insert. It’s the safe bet for most decorative pillows on sofas and beds.
2. Snug or “Euro” Fit (17×17 or 17.5×17.5 Cover)
For a very tight, crisp look, some choose a slightly smaller cover. A 17×17 inch cover on an 18×18 insert creates a very full, firm pillow. This is often seen in European-style sham pillows. It gives a more formal and structured appearance. Be aware that it can be harder to get the insert into the cover.
3. Relaxed or “Loose” Fit (19×19 or 20×20 Cover)
If you prefer a casual, slouchy look, a larger cover is the way to go. A 19×19 or even 20×20 cover on an 18×18 insert creates gentle folds and a soft, inviting feel. This style works great in bohemian or cozy, lived-in spaces. It’s also more forgiving if your pillow insert is slightly under-filled.
The Importance of the Pillow Insert
Your cover’s fit is also determined by the insert itself. Not all 18×18 inserts have the same fullness. A high-quality, overstuffed down insert will fill a cover more tightly than a budget polyester one. Always consider the plumpness of your insert when choosing a cover size.
If your insert has lost its fluff, a smaller cover can help it look fuller. Conversely, a very dense insert might need a true 18×18 or even a slightly larger cover to avoid looking overstuffed. It’s a good idea to feel your insert’s firmness before you buy.
How to Measure Your Pillow Accurately
Before you buy a new cover, it’s smart to measure your pillow insert. Don’t assume it’s exactly 18 inches. Over time, inserts can compress or shift. Here’s a simple step-by-step guide:
- Lay your pillow insert on a flat surface.
- Using a soft measuring tape, measure from seam to seam across the center of one side. Do not measure the outer edges if they are rounded.
- Repeat for the other side to confirm it’s a perfect square.
- Note the measurement. If it’s 17.5 inches, you might want a 17.5 or 18-inch cover depending on the fit you want.
Closure Types and Their Impact
The way a pillow cover closes also affects the final look and ease of use. The main closure types are:
- Zipper Closure: Hidden zippers give the cleanest look. They allow for a tight fit and are durable. They can sometimes be tricky to close if the pillow is very full.
- Envelope Closure: A overlapping flap on the back. It’s simple, has no visible hardware, and is easy to use. It can sometimes show a slight bump where the flap lies.
- Button/Tie Closure: Often used for a rustic or traditional style. Buttons can pop if the pillow is too tight. Ties offer a adjustable closure but can come undone.
For an 18×18 pillow, a hidden zipper or envelope closure are the most popular and reliable choices. They help maintain the square shape without bulges.
Fabric Choices and Shrinkage
Fabric is a huge factor in your final pillow size. Natural fibers like cotton and linen are prone to shrinkage, especially on the first wash. A pre-washed or “washed” linen/cotton cover is more stable. If you buy unwashed fabric, expect it to shrink by 3-5%.
This means an unwashed 18×18 cotton cover could become a 17×17 cover after washing. Always check the product description for shrinkage notes. If it doesn’t mention pre-washing, you might consider sizing up to a 19×19 cover if you plan to wash it in hot water.
Synthetic blends like polyester or velvet typically have minimal too no shrinkage. They will hold their 18×18 size very well wash after wash. This makes them a predictable choice.
Step-by-Step Guide to Putting on a Tight Pillow Cover
Struggling with a snug cover? This method makes it easier:
- Turn the cover inside out.
- Place your hands inside the cover and grab the two far corners.
- Now, grab the two corresponding corners of your pillow insert through the cover.
- Shake and pull the cover right-side-out over the insert, using the corners you’re holding as a guide.
- Once the cover is mostly on, adjust the corners by pushing them firmly into place from the outside.
- Finally, zip or close the opening.
Custom and DIY Covers
If you’re making your own cover, remember to add seam allowance. For an 18×18 finished cover, you need to cut your front panel to 19×19 inches (assuming a ½-inch seam allowance on all sides). The back panels for an envelope closure will need additional fabric for the overlap. Always wash and iron your fabric before cutting and sewing to account for any initial shrinkage.
Care and Maintenance for Longevity
To keep your 18×18 pillow cover looking its best, follow these tips:
- Check the care label. Most covers are machine washable in cold water on a gentle cycle.
- Use mild detergent and avoid bleach, which can weaken fibers.
- Tumble dry on low heat or air dry to prevent excessive shrinkage. Removing while slightly damp and ironing can give a crisp finish.
- For delicate fabrics like silk or velvet, professional dry cleaning is often recommended.
- Rotate and fluff your pillows regularly to even out wear and sun exposure.
Common Mistakes to Avoid
Here are a few pitfalls people often encounter:
- Assuming all 18×18 inserts are the same size (always measure!).
- Forgetting to account for fabric shrinkage when ordering.
- Choosing a snug 17×17 cover for a thin, under-filled insert—it will look limp.
- Not considering the closure; a zipper can be visible on light-colored fabrics if not well-made.
- Overstuffing a cover, which puts stress on the seams and can cause them to rip over time.
FAQ Section
Q: What is the best size pillow cover for an 18×18 pillow insert?
A: The best size is typically an 18×18 inch pillow cover for a standard, plump fit. This is the intended pairing for a perfect look.
Q: Should I get an 18×18 or 19×19 pillow cover?
A: Choose 18×18 for a full, standard fit. Choose 19×19 if you want a casual, relaxed look with soft folds, or if your fabric is prone to shrinkage and wasn’t pre-washed.
Q: Can I put an 18×18 pillow in a 20×20 cover?
A: Yes, but the pillow will appear very loose and slouchy. It will have significant extra fabric and won’t hold a square shape well. This is a specific style choice.
Q: How much smaller should a pillow cover be?
A: For a very tight, formal fit, covers are often 0.5 to 1 inch smaller than the insert (e.g., 17×17 for an 18×18 insert). We don’t recommend going more than 1 inch smaller, as it strains the seams.
Q: Why does my 18×18 pillow cover look too tight?
A> It’s likely you have a “snug fit” cover, your insert is very overstuffed, or the fabric shrank after washing. Measuring both the insert and the cover can help you diagnose the issue.
Final Thoughts on Selecting Your Cover
Choosing the right pillow cover size for your 18×18 pillow is mostly about personal preference. Start with the standard 18×18 size for a guaranteed good result. Remember to think about your insert’s fullness and your desired style—crisp and formal or soft and casual. Always check fabric care instructions to manage expectations around shrinkage.
With these guidelines, you can confidently select or make a cover that makes your pillow look professionally styled. The right fit protects your insert and refreshes your room’s decor effortlessly. Now you have all the information needed to make the perfect choice for your home.