You must put the value in meters if you want a result in feet, i.e.
10 m = 32.8084 feetYou must put the value in feet if you want a result in centimeters i.e.100 feet = 3048 cmYou must put the value in centimeters if you want a result in meters, i.e.50 cm = 0.5 mm = ft × 0.3048