You do not.
A centimetre (cm) is a measure of length or distance whereas a cubic metre is a measure of volume. The two measure different things and, according to the basic principles of dimensional analysis, conversion from one to the other is not valid.
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Divide by 10^3
Inches cubed x 16.387 = cm cubed
0.1m^3
divide number by 1000
First you have to convert centimeters into meters. 100 cm = 1 m Lets say you have 68 centimeters as a measurement. 68 cm = .68 m Now you have a measurement in meters. Simply cube the answer to convert 68 centimeters into cubed meters. (.68m)3 = .314432 m3