How to use this wallpaper calculator
Enter room dimensions and usable roll coverage, then include waste for trimming and pattern matching.
How the calculation works
Wall area = 2 × (length + width) × heightRolls = wall area × (1 + waste %) ÷ usable roll coverageAdvertisementGoogle AdSense placeholder
Example project
A 10 × 12 ft room with 8 ft walls has 352 sq ft of gross wall area.
Practical tips
- Use usable roll coverage.
- Pattern repeat can increase waste.
- Order the same dye lot.
Frequently asked questions
Why does pattern repeat matter?
Matching the design can use extra length on every drop.
Subtract windows?
A waste allowance often handles small openings in rough estimates.
What coverage should I enter?
Use manufacturer usable coverage.