wikiHow Feet to Inches Calculator To convert feet to inches, you need to multiply the number of feet by 12 (because there are 12 inches in one foot). Here is the formula: Number of inches = Number of feet x 12 For example, if you want to convert 5 feet to inches, you would use the formula as follows: Number of inches = 5 feet x 12 = 60 inches So 5 feet is equal to 60 inches. Page