GPA Scale Please help

What scale is my schools gpa calculated on

A+=4.33
A=4.0
A-=3.66
B+=3.33
B=3
B-=2.66
C+=2.33

and so on…

for honors courses you get .66 higher. so for example if you get a B you get a 3.66 in an honors course. for ap it is 1 higher so for a B you would get a 4.0. What scale is my GPA calculated on. For the college I want to go to they put their student averages on a 4.5 scale so i really want to compare my gpas to their scale. please help!

That is sometimes called a 4.0 scale but IMO should be a 4.33 scale. Weighting is different.