electronic scales have a tare button which will zero out the weight on the scale. All you have to do is submerge the head, steady it, then read the new gram weight on the scale. If the weight is 453g, then the volume will be 453cc.

Now that we have established the different methods of measuring volume, we will look at the importance from a design standpoint. Since the USGA and the R&A of St. Andrews established a volume limit on the head, every manufacturer is making drivers that go up to this size limit. There are also a few other restrictions in the Rules of Golf that apply to the size of a driver. These are the following from Appendix II. 4. Clubhead, b. Dimension and Size:

1. The distance from the heel to toe of the clubhead is greater than the distance from the face to the back;