Calculation for kilo or gram.

Your question is very vague.
If you have a cost per gram and want to find cost per kilogram, use multiplication to convert:

cost per gram = C

C dollars 1000 g
________ * ______ = 1000C dollars/kg
g 1 kg

cost per gram = C

C dollars 1000 g
________ * ______ = 1000C dollars/kg
g 1 kg

cost per gram = C

C dollars 1000 g
________ * ______ = 1000C dollars/kg
g 1 kg