You don't need to. 12" is 1 linear foot.
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90 X 144 (INCHES PER SQ FT) = 12,960 INCHES. 12,960 INCHES DIVIDED BY 12 (INCHES PER LINEAR FT) = 1080 LINEAR FEET
80 inches is 6.66 feet.
British linear measurement is feet and inches
26,706 in / 12 (in/ft) = 2,225.5 linear feet.
To convert from inches to feet, divide by 12.