For example, if the length of one wall is 119 1⁄4 inches (302. 9 cm), then round it up to 120 inches (304. 8 cm). If your room is rectangular, then you only need to find the lengths of 2 walls since the ones on the opposite side of the room will be the same measurement.
For example, if your wall is 95 1⁄2 inches (242. 6 cm) tall, round it up to 96 inches (243. 8 cm) instead.
For example, if your wall is 120 inches (304. 8 cm) long, divide it by 12 inches (30. 48 cm) to find it’s length in feet or meters, which is 10 feet (3. 0 m).
For example, if your total perimeter was 48 feet (15 m) and the height was 10 feet (3. 0 m), then the total surface area equals: (48)(10). Multiply the numbers together to find the solution: (48)(10) = 480 square feet (45 m2).
For example, if the base of the triangle is 10 feet (3. 0 m) and the height is 5 feet (1. 5 m), then the surface area is (10)(5)/2. Simplify the equation: 50/2 = 25 square feet (2. 3 m2).
For example, if your wallpaper pattern has flowers on it, measure the vertical distance from the center of one flower to the center of an identical flower. If the wallpaper has a random pattern or is non-repeating, then you don’t need to find any measurement. Many times, the pattern repeat for your wallpaper will be printed on the packaging.
If the pattern repeat is 0–6 inches (0. 000–15. 24 cm), then there is 25 square feet (2. 3 m2) of usable wallpaper. For a pattern repeat between 7–12 inches (17. 78–30. 48 cm), then you can use 22 square feet (2. 0 m2) of wallpaper. If the repeat is 13–18 inches (33. 02–45. 72 cm), then use 20 square feet (1. 9 m2) of wallpaper. For a pattern that repeats every 19–23 inches (48. 26–58. 42 cm), then there is 15 square feet (1. 4 m2) of usable wallpaper. While wallpaper rolls may be different widths, they cover the same total surface area.
For example, if your total surface area is 480 square feet (45 m2) and each roll gives you 25 square feet (2. 3 m2) of usable wallpaper, then 480/25 = 19. 2. Round the answer up to the nearest number. So, you would need 20 rolls total to cover your wall. Wallpaper is sold in single and double rolls. For example, in the previous calculation, you can buy either 20 single rolls or 10 double rolls to cover the same area.
For example, if you needed 20 rolls to complete your project, get another 2-4 rolls in case you need them. Bring your estimate into a wallpaper retailer and have them double check your estimate to ensure that you have enough for your job.
