How to Measure a Throw Pillow Cover Correctly: A 5-Step Checklist for Bulk Buyers

Look, I've been in procurement for over 5 years now. And one thing I've learned the hard way: measuring a throw pillow cover sounds dead simple—until you're staring at a batch of 200 covers that don't fit the inserts you already bought.

In 2024, I managed a $12,000 order of Rifle Paper Co. throw pillows for a hospitality client. We had the designs nailed—gorgeous floral patterns from their Delphine collection. But we almost blew the entire budget on sizing because we assumed 'standard' meant the same thing to everyone.

Here's a 5-step checklist I now use for every bulk pillow order. Follow it, and you won't repeat my mistakes.

When to Use This Checklist

Use this when you're ordering custom or branded throw pillow covers in bulk—whether it's for a hotel chain, a corporate event, or a promotional gift program. This isn't for sewing your own pillows at home. It's for procurement decisions where every inch matters.

Step 1: Measure Your Insert First—Not the Other Way Around

I cannot stress this enough. Everyone starts by measuring the cover they want to order. Don't. Start with the pillow insert you already have or plan to buy.

Here's why: covers are made to fit inserts, not the reverse. If you measure a cover that's slightly stretched from being stuffed, you'll get the wrong size.

• Lay your insert flat on a hard surface. Don't fluff it.
• Measure across the center from seam to seam. Not the edge—the seam where the fabric meets.
• Measure length and width separately. Even square pillows can be off by a quarter inch.

Checkpoint: Write down both measurements. If they're more than 0.5 inches different, it's not a true square—note that for your order.

Step 2: Account for Insert Loft (The Thing Everyone Forgets)

This is the step I missed on that $12,000 order. Loft is the thickness of the insert. A 20x20 inch cover fits a 20x20 inch insert only if the insert is standard loft (about 4-5 inches thick). If you use a high-loft insert (6+ inches), a 20x20 cover will struggle to close or look overstuffed.

Most bulk pillow covers are designed for standard loft inserts. If you're using high-loft, you need a cover that's 1-2 inches larger on each side.

A quick comparison I made last quarter:

• Standard loft insert (4-5 inches): Cover size = insert size
• High-loft insert (6+ inches): Cover size = insert size + 1-2 inches

Checkpoint: Ask your supplier what loft they designed the cover for. If they don't know, that's a red flag.

Step 3: Decide on Closure Type—It Changes Your Measurement

Not all closures are created equal. And the closure type affects how the cover fits.

• Envelope closure (overlap): The back panels overlap. This is forgiving—you can stuff a slightly too-large insert without it gaping.
• Zipper closure: Precise. Zippers don't stretch. You need exact measurements.
• Button closure: Somewhere in between. Buttons can gap if the insert is too big.

I've found that zippered covers need to be within 0.25 inches of the insert size. Envelope closures have a bit more wiggle room.

Checkpoint: For zippered covers, order your cover size to match the insert size exactly. For envelope, you can size up 0.5 inches without issue.

Step 4: Always Measure Two Samples from Different Batches

Here's something I learned after getting burned twice: manufacturers have tolerances. A 20x20 inch cover from batch A might be 20.1 inches. From batch B, it could be 19.8 inches. That's within spec for some manufacturers, but it's a disaster when you're matching 200 covers to 200 inserts.

When you receive samples, measure at least two from different production runs. If the variance is more than 0.3 inches (about 0.8 cm), flag it with the supplier before placing the bulk order.

In my cost tracking spreadsheet, I have a column for 'batch variance.' Orders with less than 0.2 inches variance have a 95% satisfaction rate. Above 0.4 inches? That drops to 60%.

Checkpoint: Request samples from two different batch dates. Measure and compare.

Step 5: Factor in Fabric Type—Prints Behave Differently

Rifle Paper Co. covers use various fabrics, from cotton canvas to velvet. The fabric affects how the cover stretches and drapes.

Cotton canvas has minimal stretch. Velvet has more give. A printed cover with a busy pattern (like Rifle Paper Co.'s Estee or Delphine florals) also behaves differently because the print itself can distort the fabric slightly during manufacturing.

For printed covers, add 0.25 inches to your measurement tolerance. This accounts for any slight misalignment in the pattern registration.

Checkpoint: Note the fabric type before finalizing measurements. Velvet and canvas need different approaches.

Common Mistakes I've Seen (and Made)

• Measuring the cover while it's stuffed: Always measure flat and empty. A stuffed cover can be 0.5-1 inch larger.
• Assuming all 20x20 inserts are the same: They're not. I've measured '20x20' inserts that were actually 19.75x20.25. Always measure your inserts.
• Skipping the seam measurement: Some people measure from edge to edge, including the seam allowance. That's wrong. Measure from seam to seam.
• Not accounting for shrink: If you're washing the covers (e.g., for hospitality use), cotton can shrink 2-3%. Order covers 0.5 inches larger if they'll be washed.

Final thought: Part of me wants to keep things simple and just order 'standard' sizes. Another part knows that simplicity can cost you when 200 covers arrive 0.3 inches too small. I've learned to spend 30 minutes on measurements upfront—it saves hours of returns and reorders later.

Prices as of April 2025; verify current rates with your supplier.