cm - centimeter. Unit of length.   1 cm = 0.01 m.   1 cm = 10 mm.

mm - millimeter. Unit of length.   1 mm = 0.001 m.  1 mm = 0.1 cm.

m - meter.       Unit of length.   1 m = 100 cm.    1 m = 1000 mm.

kg - kilogram.   Unit of mass.     1 kg = 1000 g.

g  -             Unit of acceleration. 1 g = acceleration of free falling body near the Earth surface. 1 g = 9.81  = 32.17 .

See the lessons

    - Converting feet to meters, inches to centimeters, miles to kilometers and vice versa
    - Converting speed units: miles per hour to kilometers per hour and vice versa
    - Converting measures of volume: cubic feet and cubic meters
    - Converting liquid volume measures: liters, gallons, and barrels
    - Units conversion examples

in this site.