Tinker 
How to use the GPA calculator
Write one course per line. The last two items on each line must be the grade and the credit hours; anything before them, such as the course name, is ignored. 'Physics B+ 4', 'B+ 4' and 'B+, 4' all work.
Grades can be letters (A, A-, B+ ... F) or grade points you already know, like 3.7. Choose whether your school counts an A+ as 4.0 or 4.3.
The formula
Each letter converts to grade points: A = 4.0, A- = 3.7, B+ = 3.3, B = 3.0, B- = 2.7, C+ = 2.3, C = 2.0, C- = 1.7, D+ = 1.3, D = 1.0, D- = 0.7, F = 0.
Multiply each course's grade points by its credit hours to get quality points. GPA = total quality points ÷ total credit hours. Heavier courses therefore count more.
Worked example
Biology A (3 credits) = 12.0 points, Calculus B+ (4 credits) = 13.2, History A- (3 credits) = 11.1, Art C (2 credits) = 4.0. Total = 40.3 quality points over 12 credits.
40.3 ÷ 12 = 3.358, shown as a GPA of 3.36.
Tips
To find a cumulative GPA, add a line for your previous record using your old GPA as the grade and your completed credits, e.g. '3.2 45', then list this term's courses.
Pass/fail courses usually don't count toward GPA, so leave them out. Some schools use different point values or weight honours courses; results here follow the common unweighted 4.0 scale and are an estimate of your official figure.
Frequently asked questions
Is GPA weighted by credit hours?
Yes. A 4-credit course affects your GPA more than a 1-credit course, which is why each grade is multiplied by its credits.
What is an A+ worth?
Most US colleges cap it at 4.0, but some award 4.3. Use the selector to match your school.
How do I calculate cumulative GPA?
Enter your existing GPA and total credits as one line (for example '3.4 60'), then add your new courses. The result combines both.
Does an F count?
Yes, an F is 0 points but its credits still count, which pulls the average down unless the course is retaken and replaced under your school's policy.