Calculate your weighted grade point average on a 4.0 scale.
Add each course, pick its letter grade and enter the credit hours to calculate your weighted GPA on the standard 4.0 scale. Add as many courses as you need.
Multiply each course's grade points by its credit hours, sum them, and divide by total credit hours.
The standard US 4.0 scale (A = 4.0 down to F = 0.0).