How to Measure for Wallpaper & How Much to Order

Let’s get the fit just right.

Measuring & Ordering Your Wallpaper

Here’s how to measure your walls and calculate exactly what you need.

Measuring for wallpaper feels like a high-stakes math test, but I promise it’s simpler than it looks. Whether you’re in a brand-new build or a 1920s home with "character" (like mine), here is how to get an accurate count and avoid the "oops" moments.

Infographic showing how to measure wall height and width for wallpaper. Arrows indicate measuring the tallest point of the wall and the total width above the skirting board.

Step 1: The Three - Point Check

Walls are rarely perfectly square. To avoid a gap at the top or a short edge at the bottom, measure your wall height in three places: the left, the center, and the right.

The Golden Rule: Always use the tallest height and widest width as your final numbers.
Sloped Ceilings: If your ceiling angles down, measure to the highest point. We want the pattern to be continuous even as the wall height changes.
Chimney Breasts: Don't forget to measure the "returns" (the side depths). Those extra inches are easy to miss!

Diagram of vertical wallpaper panels matching across a wall with a window and door. Shows why to measure a full rectangle to maintain pattern continuity around obstacles.

Step 2: Ignore the Obstacles

When measuring your width, act as if your windows and doors aren't there. My wallpaper is printed in full-length vertical panels. To keep the pattern matching perfectly across the room, the panels need to run straight over the window or door frame.

You’ll simply smooth the paper over and trim the excess away during installation. It feels like waste, but it’s the secret to a professional, seamless finish.

Step 3: How many rolls do I need?

Once you have your numbers, you can use the calculator below for a quick estimate. I always recommend adding 10% extra to your total. This covers the "trim factor," pattern matching, and gives you a safety net if a cut goes wrong.

The "Double-Check" Manual Method

If you’re like me and prefer to do the math yourself (or just want to triple-check the computer!), here is how to work it out manually using inches:

Find your total width: Take your widest wall measurement in inches.
Divide by roll width: Divide that number by 30" (my standard roll width).
Round up: If the answer is 3.2, you need 4 panels. Always round up to the next whole number—you can't order half a panel!
Check your height: Ensure your wall height fits within the roll length (usually 8ft, 10ft, or 12ft).

The "Batch Match" Rule: Wallpaper is printed in batches, and colors can vary slightly between them. It’s much safer (and cheaper in the long run) to order one extra roll now than to run short later and risk a slight color mismatch with a new batch.

Still staring at the tape measure?

If the numbers aren't making sense, don't guess. Send me your dimensions and a quick photo of the room, and I’ll do the math for you.

Contact Me

Next Steps

Now that you’ve got the numbers, it’s time for the best part, choosing the design (if you haven't already). Whether you’re looking for a bold statement or a subtle textured look, I’ve organized everything to help you find your perfect match.

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check out the blog for other wallpaper tips

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