How font height is measured-
Fonts are measured by the total space they take up from
the highest letter to the lowest letter. See the image
below, showing Scriptina, a pretty font that is very tall from top to bottom. It's compared to Georgia font at the same
height.

Notice how much longer the block font is besides the letters being wider and the illusion
of the phrase being bigger. Keep this in mind as you do designs with Script lettering.