In most instances, the term "foot" refers to a linear foot. A linear foot is equal to 12 inches, or 1 foot. It isn't necessary to convert feet to linear feet because they are one and the same. If a board is 5 feet long, it is 5 linear feet. The term linear only applies to units of measure that are a straight line. Lumber, vinyl, fabric and fencing are typically measured in linear feet. Only the length is measured. Width is irrelevant for linear measurements.
Calculate Linear Feet
Make sure that the item you are measuring is a straight line.
Measure the length of your item in inches. Do not include the width of your item in your measurement because the width is not relevant to linear feet.
Convert the inches to feet by dividing the total number of inches by 12. The result is equal to the linear feet of your item.