-Centimeters are metric units of measurement (like inches, feet, etc.), and there are 2.54 centimeters in one inch

-Grams, however, are units of weight, like ounces and pounds. There are about 28 grams in one ounce.

-“Ml” is an abbreviation for “milliliter”, or one thousandth of a liter, which is a volume measurement about equivalent to one quart. One millileter is about a fifth of a teaspoon.

So, none of these units measures the same thing, and cannot be converted to another one of the units you give. You might try these websites:

http://www.worldwidemetric.com/metcal.htm

http://www.onlineconversion.com/auto_convert.pl

Otherwise, grams per centimeter defers depending on what you are measuring.

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