Question: how do you calculate repeating wallpaper?
Answer: Example: Assuming a room of 380 square feet:
- No Repeat: 380 sq ft./25 sq ft of usable wallpaper = 15.2. ... 
- Small Repeat: 380 sq ft./22 sq ft of usable wallpaper = 17.27. ... 
- Large Repeat: 380 sq ft./18 sq ft of usable wallpaper = 21.1.