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How to accurately calculate the usage of wall wallpaper? Better have a recipe?
Wall height and flower spacing = the length of each wallpaper (decimal point followed by mantissa in a system)

The length of each roll of wallpaper ÷ The above result = How many sheets can be cut from a roll of wallpaper?

Total length of room wall ÷ wallpaper width = number of frames actually used (with mantissa after decimal point)

Total pages ÷ The number of pages that can be cut for a roll of wallpaper = the number of pages actually used (with a mantissa after the decimal point).