You would need the dimensions of the item that you are trying to calculate the distance on. For example, a 12 inch by 12 inch tile is one square foot. 18 of them would be 18 square feet. If you place them end-to-end you would have 18 linear feet. However, if you had a 6 inch by 12 inch tile, it would take 36 of them to get 18 square feet. If you lined the tiles up in a row on the 6 inch side, you would have 18 linear feet. If you lined them up on the 12 inch side, you would have 36 linear feet. Linear feet does not take into account width, only length. So trying to translate a 2-dimensional value into a 1-dimensional value is difficult if not impossible without more details.
See this answer as well....
How many linear feet are there per square foot
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