Sizing??

Hello,

Can anyone suggest an easy/quick way of sizing words to an exact size?

So for example, I type my work and convert to curves, weld etc and then I want to size it to 4cm in height, for example. However, if the word has parts of letter below the base line or above, then this gives the appearance of the word being smaller than some others. So for example:

These two names have the same size letters and are 4 cm from the K and R. However, because of the y in Kathryn, I have to set the height larger than 4cm, to get the K to be 4cm. So therefore, is there a quicker way of automatically doing this? I currently create a box 4cm high and then manually fit it to the box.

Any help greatly appreciated.