Use a standard calculator to convert cubic inches to cubic centimeters by multiplying the measurement in inches by 16.387064. Alternately, an online calculator designed for imperial to metric conversions can be used, such as those at The Calculator Site.
Cubic inches and cubic centimeters are both measurements of volume. Since they measure the same kind of thing, it is simple to convert from one to the other using multiplication or division.
When performing multiplication or division on measurements via calculator, take care to avoid giving a false impression of high precision. Although one cubic inch is precisely equivalent to 16.387064 cubic centimeters, the product of multiplying a measurement in inches by 16.387064 only has as many significant digits as the original measurement.