5According to 'feet to cm' conversion formula if you want to convert 5 Feet 5 Inches to Centimeters you have to multiply 5 by 30.48. Then convert inches to cm by multiplying 5 by 2.54 (according to Inches to cm conversion formula).AndLearn fifth grade math—arithmetic with fractions and decimals, volume, unit conversion, graphing points, and more. This course is alned with Common Core standards.