How to calculate your GPA, and the grade you need on the final

Your GPA is the average of your course grade points, weighted by credits. Multiply each course's grade points by its credits, add those totals, and divide by the total credits. To find the score you need on a final, rearrange your weighted average: needed = (target − current × (1 − w)) ÷ w, where w is the final's weight as a decimal. Both steps are short enough to do with a pencil, and the calculators check the arithmetic.

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The 4.0 scale

Many US schools convert letter grades to grade points like this:

Letter grade	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
F	0.0

This is one common mapping. Schools differ on which plus and minus grades exist and where the cut-offs fall, so check your school's grading policy before relying on it.

Credits are weights

A 4-credit lab counts for more than a 2-credit elective, so the GPA uses credits as weights. Here is a worked example:

Course	Credits	Grade	Points	Credits × points
Biology	4	A	4.0	16.0
History	3	B	3.0	9.0
Art	2	C	2.0	4.0
Chemistry	4	B−	2.7	10.8
Total	13			39.8

39.8 ÷ 13 = 3.06. The GPA is 3.06.

A common mistake is to average the grade points directly. Here that gives (4.0 + 3.0 + 2.0 + 2.7) ÷ 4 = 2.93, which ignores the lab's extra weight. Always multiply by the credits first.

Cumulative GPA

Your cumulative GPA covers every graded course across all terms. Calculate it from total points and total credits, not by averaging the term GPAs. Suppose one term has 15 credits at 3.0, which is 45 points, and another has 45 credits at 3.6, which is 162 points. The cumulative GPA is (45 + 162) ÷ 60 = 3.45. Averaging the two term GPAs gives 3.3, which is wrong because the second term carried far more credit.

Weighted GPA

Honours, AP and IB courses are often "weighted", which means they add extra points to the grade. A school might add 0.5 for an honours course or 1.0 for an AP course, on a scale that can go above 4.0. The size of the bonus and whether a school weights at all vary by school and by country, so use the rules in your own transcript policy. The GPA calculator has a weighted option where you set the bonus yourself.

The grade you need on the final

Grade calculations on a course with a final exam use this formula:

Score needed on final = (target − current × (1 − w)) ÷ w

• target is the course grade you want, as a percentage
• current is your grade so far, as a percentage
• w is the final's weight in the course, as a decimal (25 percent is 0.25)

Three examples:

1. Current 78 percent, final worth 25 percent, target 80 percent. (80 − 78 × 0.75) ÷ 0.25 = (80 − 58.5) ÷ 0.25 = 86. You need 86 percent on the final. Check: 0.75 × 78 + 0.25 × 86 = 80.
2. Current 55 percent, final worth 40 percent, target 70 percent. (70 − 55 × 0.6) ÷ 0.4 = (70 − 33) ÷ 0.4 = 92.5 percent.
3. Current 85 percent, final worth 20 percent, target 90 percent. (90 − 85 × 0.8) ÷ 0.2 = (90 − 68) ÷ 0.2 = 110 percent. That is above 100, so the target is out of reach from the final alone.

Common mistakes include entering 25 instead of 0.25, and using the exam's weight when the syllabus assigns it a different share. Also check whether your school rounds grades before or after the final.

If the course is graded by points rather than percentages, convert first: points earned ÷ points possible × 100. The percentage calculator does that step, and the grade calculator handles the final-exam target.

Quick answers

Does a failed course count in GPA? Most US schools count an F as 0 points, with its credits included, but policies differ. Check your transcript rules.

Are pass/fail courses included? Usually not, because they do not carry grade points. Check your school's policy.

Can GPA go above 4.0? Yes, when a school uses weighted grades.

Is it the same as a percentage average? No. A percentage average uses the score, while GPA uses the grade-point scale and the credits.

For the percentage arithmetic behind course grades, read how to calculate a percentage.