Answer:
A 3.7 GPA on a 5 point scale is equivalent to a 2.96 on a 4 point scale. If you want to calculate your 4 point scale GPA without the use of a conversion calculation, look at your letter grades and find their equivalent 4 point GPA values. Find the average by adding all the values together, then dividing the total by the number of values.
Letter Grade = 4 Point GPA Value = Percentage Range*
A+ or A = 4 = 94-100
A- = 3.67 = 90-93
B+ = 3.33 = 87-89
B = 3 = 83-86
B- = 2.67 = 80-83
C+ = 2.33 = 77-79
C = 2 = 73-76
C- = 1.67 = 70-72
D+ = 1.33 = 67-69
D = 1 = 62-67
D- = .67 = 60-62
F = 0 = less than 60
*It should be noted that the imaginary lines drawn to denote what percentage range is, for example, A- and what is B+ change from state to state and school to school. Also, if you were graded on a curve, the ranges would be different. Your academic advisor or college counsellor can almost certainly help you with this.
Also, if you are planning to report your GPA to a college, they ask on which scale your GPA is, so you can put 3.7 and say it is on a 5 point scale and they will recalculate according to their standards, often unweighting classes and removing non-academic classes such as gym, music, theater, art, woodshop, sports, etc.