Pick your size and if you want two tone or single color also pick your font! The size options listed are for the LENGTH of your decal. The height will be proportional to your name and will vary based on the amount of letters in the name, for example, a 5 letter name such as "Smith" in 24" would come out to be 9" tall (depending on the font as well) whereas a 7 letter name such as Johnson in a 24" decal would come out to be about 6.5" tall due to having more letters. As I mentioned, the font selected can also affect the height of the decal as some fonts are more bold than others causing thicker letters and giving the decal more height overall.