Wallpaper Calculator
Rolls of wallpaper.
Rolls of wallpaper.
How to use Wallpaper Calculator
- Enter your wall width and height, roll size, and pattern repeat
- Subtract the number of doors and windows in the room
- Read how many rolls to buy after pattern-repeat waste
About Wallpaper Calculator
The Wallpaper Calculator works out exactly how many rolls to buy for a room, so you don't run short or overpay for spares. Enter your total wall width or room perimeter and the wall height, the width and length of the roll you're buying, the pattern repeat, and how many doors and windows to subtract. It figures out how many full-height strips (drops) you need, how many strips each roll yields, and rounds up to the number of rolls required while adding the extra waste a pattern repeat creates.
Because it starts from your wall width and height, it's easy to think in square footage too: those same measurements give you the total area the paper has to cover. You can switch between feet and meters, and every number updates the moment you change an input, so you can compare a plain paper against a large-repeat design, or see how subtracting a door or two changes the roll count. Getting the measurements right up front is the whole game, which is why the tool asks only for the few dimensions that actually decide the answer.
The calculator is completely free with no sign-up, account, or usage limits, so you can rerun it for every wall in the house. It runs entirely in your browser, which means the measurements you type are never uploaded, saved, or shared. They stay on your own device.
Frequently asked questions
- How many rolls of wallpaper do I need?
- Divide the width you want to cover by the roll width and round up to get the number of full-height strips (drops). Then divide the roll length by each strip's cut length to see how many strips one roll yields, and divide the strips needed by that, rounding up. This calculator does all of that for you and adds pattern-repeat waste automatically.
- How does the pattern repeat affect how much I need?
- With a patterned paper, every strip has to be cut to the next whole multiple of the repeat so the design lines up between drops. That means a taller cut length and more waste per strip, which can reduce how many usable strips you get from each roll. Enter 0 for a plain paper with no repeat.
- How do I measure a room for wallpaper?
- Measure the width of every wall you're papering and add them up for the total width, or measure the room's perimeter, then measure floor to ceiling for the height. Count the doors and full windows you can skip over. Enter those numbers and the tool handles the strip, repeat, and roll math for you.
- How do I calculate the square footage of wallpaper I need?
- Multiply your total wall width by the wall height to get the area, which is the square footage the paper has to cover before you take out doors and windows. This calculator works from those same wall dimensions, so once you've measured width and height you already have what you need for both a square-footage estimate and the roll count. Use the area if your paper is priced by the square foot, or the roll total if it's sold by the roll.
- Can I calculate wallpaper in yards?
- The tool works in feet or meters, which covers most wallpaper sold by the roll. Some papers, like grasscloth and many wide-width or commercial rolls, are sold by the yard instead, in which case you divide the total length in feet by three to convert to yards. The strip and drop math is the same; only the unit you buy in changes.
- Does this estimate wallpaper installation cost?
- This calculator estimates the materials, meaning how many rolls and how much area you need, not the labor. To ballpark an installation cost, take the roll count from here, multiply by your price per roll, then add a hanger's fee, which is usually quoted per roll or per square foot in your area. Getting an accurate material count first keeps the rest of the quote honest.
- Can it estimate wallpaper removal cost?
- Removal cost depends on labor, wall condition, and how many layers of old paper are up there, so it isn't something a roll count can predict. What this tool helps with is the flip side: once the old paper is off, use it to work out how many new rolls you'll need to redecorate. Strippable and peelable papers come off faster and cost less to remove than pasted-and-painted-over ones.
- Is this the same as the Lowe's or Wallpaper Direct calculator?
- It does the same core job, turning your room measurements into a roll count, without tying you to one store's catalogue. Retailer calculators like Lowe's or Wallpaper Direct assume their own product's roll dimensions, whereas here you type in the exact roll width, length, and pattern repeat from whatever paper you're buying. That makes it handy for comparing products or brands before you order.
- Should I subtract doors and windows?
- You can. Each door or window you enter removes roughly 0.9 m (about 3 ft) of wall width from the run, since you still need short strips above and below openings. For a safe estimate on rooms with only small windows, you can leave openings at 0 and rely on the spare roll.
- Do I need extra rolls for waste?
- It's smart to buy one extra roll beyond the calculated number for trimming mistakes, matching, and future repairs. Also make sure every roll shares the same batch (lot) number, because color can vary slightly between print runs.
- Is this wallpaper calculator free?
- Yes, it is completely free to use with no account, sign-up, subscription, or usage limits. You can run as many estimates as you like.
- Is my data uploaded or stored anywhere?
- No. Every calculation runs entirely in your browser using JavaScript. Your measurements are never sent to a server, saved, or shared, so your inputs stay private on your own device.