been searching but not finding any thing that will tell me how tall and wide in inches a tire will be. is there a conversion table or formula? the tires i want to know about are 275/50/15 any help?

Sure.

That tire is 275mm wide. There are 25.4mm per inch. So 275/25.4 = 10.8" wide.

50 is the side wall height in percent of the width. So the sidewall height is 0.5*275/25.4=5.4"

Wheel size is 15". So overall height is 15+5.4+5.4 = 25.8"

John

thank you so very much... i just hope i dont lose the formula for the next time....

Width - divide the mm section width by 25.4

Tire diameter - multiply the section width * profile *2, divide that number by 25.4, then add that number to your wheel diamter.

Example: (275*2*.50)/25.4 + 15 = 25.73" diameter...

http://f-body.org/gears/

put in tire size, it calculates it.
your welcome

Check out this sight. You convert anything from U.S.standards to metric or vice-verse.
http://www.worldwidemetric.com/measurements.html