Wallpaper Calculator
Enter your room size to get the wallpaper rolls you need, plus an estimated cost. Waste is included.
Wallpaper needed
Estimated cost
How to calculate wallpaper rolls
Wallpaper is sold by the roll. Find the wall area, add waste for pattern matching and cuts, then divide by the coverage per roll and round up.
Formula: rolls = wall area (sq ft) × (1 + waste %) ÷ coverage per roll, rounded up
Worked example: 12 ft × 10 ft room, 8 ft walls
Wall area = 2 × (12 + 10) × 8 = 352 sq ft. Add 10% waste: 387.2 sq ft. At 56 sq ft per roll: 387.2 ÷ 56 = 6.91, rounded up to 7 rolls.
Pattern matching
Patterned paper wastes more than plain paper, because every strip must line up. Use 15% waste or more for large patterns.
Common room sizes
Cost tips
Prices on this page are editable estimates, not quotes. Get 2 to 3 local quotes before you buy, and ask if delivery is included. Delivery, tax and waste can change the total a lot. Order a little extra for cuts and breakage, and confirm final quantities with your supplier or a qualified professional.
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Frequently asked questions
How many rolls do I need for a 12x10 room?
A 12 ft by 10 ft room with 8 ft walls needs 7 rolls at 56 sq ft per roll, with 10% waste.
How much area does a roll cover?
A standard single roll covers about 56 sq ft. Double rolls cover about 112 sq ft. Check the roll label.
How much waste should I add?
Add 10% for plain paper and 15% or more for patterned paper, because pattern matching wastes paper.
Are doors and windows subtracted?
No, this counts full walls. That leaves spare paper for repairs, which is useful since dye lots change.
Are the prices accurate?
Prices are editable estimates. The defaults are typical US figures, and your local price can be higher or lower.