new to wheels and tires

i'm a little new at all of this so i was wondering if somebody could explain the tire sizing to me? is there a method to it? if i wanted 32" tires where in the formula of numbers would it tell me, or does it?

 

They way I figure out the size is to check out the tires specs on tirerack.com

My 265's are a 31.7 in by 10.5 in.

 

Also, if you go to the top bar and highlight "Mods & Tutorials" at the bottom you will see Tire Size Calculator. That one is really helpful!

 

heres the math:

take a 265/75/16 for example:

width = 265/25.4 = 10.43"
heigth of tire off of the rim = 265*0.75/25.4 = 7.82"
heigth = ((265*0.75) / (25.4 x 2) + 16) = 31.64"


description of the numbers:
265/75/16
width in mm/aspect ratio/rim diameter in inches
mm to inch converstion = 25.4
number of "sides" off of rim = 2

width = width in mm/mm to inch conversion
heigth of tire off of the rim = width in mm*0.aspect ratio/mm to inch conversion
heigth = ((width in mm*0.aspect ratio) / (mm to inch onversion x number of "sides" off of rim) + rim diameter in inches)

 

thanks so much that was really helpful!!!!