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How to Easily and Reliably Estimate Wallpaper

How much wallpaper do I need? That’s a great question! And it isn’t hard to figure out.

One solid search on the internet for “wallpaper calculator” will turn up a bunch of results for automated engines that will crunch the numbers for you. How handy! But I’ll admit that I don’t trust someone else’s code when I’m trying to figure out how much wallpaper I need for a project. PARTICULARLY when that wallpaper has a repeat pattern, which is most of the time. I really prefer pencil, paper and a calculator.

For most installations, calculating the amount of wallpaper needed is straight forward and easy!

Below, is how I measure for wallpaper. I will walk you through the steps for estimating how much wallpaper you need. Make sure to read through the whole article for additional information and tips.

Measure in inches, ignore trim, windows and doors – this will give you a little room for mistakes and waste

Measurements you will need:

  • Height of each wall in inches
  • Width of each wall in inches
  • Vertical wallpaper repeat in inches (found in product listing)
  • Width of wallpaper in inches (found in product listing)

Calculations:

  1. Divide the height of each wall by the height of the wallpaper repeat. Round fractions up. This will tell you the number of repeats needed for the height of the wall.
  2. Multiply the result of step 1 by the height of the wallpaper repeat. This will give you the length of each strip of wallpaper required to paper from floor to ceiling with enough room to match your repeat.
  3. Divide the result of step 2 by 12. Round fractions up. This will give you the length of each strip of wallpaper in feet.
  4. Divide the width of each wall by the width of the wallpaper. Round fractions up. This will give you the number of strips needed to paper each wall.
  5. Add up the number of strips needed for each wall in order to know how many total strips will be needed to paper the whole room.
  6. Multiply the length of each strip needed by the number of strips needed. This will give you the total wallpaper needed in feet.
  7. If you are ordering wallpaper by the yard, divide the result from step 5 by 3. Round fractions up. This will give you the total wallpaper needed in yards.

See below for an example of how to estimate the amount of wallpaper needed for a room.

Take into account how much extra wallpaper you should have on hand. At minimum, we recommend adding 10% for touch ups and mistakes. Consider buying an additional roll or yardage if one of your walls is a wet wall or has other factors which may require access in the future.

If your walls are different heights or you are papering staircases or vaulted ceilings, consult a professional paper hanger to review the location for your installation. Provide them with the sizes of wallpaper rolls available and the pattern repeat for the paper you will be using. This will allow them to estimate the number of rolls required for your job and determine which roll length will reduce the amount of waste and keep your costs down. Find a paperhanger in your area through the The Wallcovering Installers Association. You are also welcome to contact us. We are happy to help you work through your measurements.

Pearl and Maude wallpaper is made to order. It is important to order enough material for your installation from a single dye lot. We recommend confirming your measurements with a professional paperhanger before ordering.

Example:

For this example, we will measure how much Bunsen Blue White Standard Wallpaper we will need to paper a 20’ x 15’ room with 9’ ceilings.

calculating wallpaper with a repeat pattern

 

 

 

 

 

 

 

 

 

 

Measurements:

how to measure for wallpaper

 

 

 

 

 

 

 

  • Height of each wall in inches = 108”
  • Width of each wall in inches = 180” (x2) and 240” (x2)
  • Vertical wallpaper repeat in inches = 14”
  • Width of wallpaper in inches = 24”

Calculations:

Divide the height of each wall by the height of the wallpaper repeat. Round fractions up. This will tell you the number of repeats needed for the height of the wall.

108”/14” = 7.7 repeats; round up to 8 repeats

Multiply the result of step 1 by the height of the wallpaper repeat. This will give you the length of each strip of wallpaper required to paper each wall with enough room to match your repeat.

8 repeats x 14” = 112” long strips

Divide the result of step 1 by 12. Round fractions up. This will give you the length of each strip of wallpaper in feet.

112” / 12 = 9.33’; round up to 10’ foot strips

Divide the width of each wall by the width of the wallpaper. Round fractions up. This will give you the number of strips needed to paper each wall.

180”/24” = 7.5 widths; round up to 8 widths

240”/24” = 10 widths

Add up the number of strips needed for each wall in order to know how many total strips will be needed to paper the whole room.

8 widths x 2 short walls = 16 widths

10 widths x 2 long walls = 20 widths

16 widths + 20 widths = 36 widths

Multiply the length of each strip needed by the number of strips needed. This will give you the total wallpaper needed in feet.

10’ x 36 widths = 360’

If you are ordering wallpaper by the yard, divide the result from step 5 by 3. Round fractions up. This will give you the total wallpaper needed in yards.

Bunsen Blue White Standard Wallpaper is sold in rolls by the foot, so this calculation does not apply to this product.

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