A millimeter, abbreviated as mm, is about as wide as the wire used to make a paperclip. Due to its small size, it takes a lot of millimeters to equal one foot; in fact, one foot is equal to 304.8 mm. That means it would take about 305 unwound paperclips laid on top of one another to create a foot. Converting feet to millimeters is a relatively simple calculation, but because of the large numbers, it may be best to use a calculator.
Instructions
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Enter the number of feet you want to convert into a calculator. For example, if you want to convert 3 feet, enter "3."
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Press the multiplication sign on your calculator. Then enter "304.8."
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Press the equal sign on your calculator. The result is the conversion of feet to millimeters. For example, if you wanted to convert 3 feet to millimeters, your result would be 914.4.