How GPA Is Calculated: Weighted vs Unweighted, With Examples

Your grade point average looks like one number, but in the US it's usually two: an unweighted GPA on a 4.0 scale and a weighted GPA that gives extra points for harder classes. Colleges, scholarship committees and some employers look at both. They also tend to recalculate your GPA their own way, so knowing the math helps you read your transcript the way they will.

This guide covers both methods with worked examples, explains where credit hours come in, and lists the mistakes that most often throw the number off.

Step 1: Turn letter grades into grade points

Almost every US high school and college starts from the same 4.0 scale:

Letter	Points	Typical % range
A / A+	4.0	93–100
A-	3.7	90–92
B+	3.3	87–89
B	3.0	83–86
B-	2.7	80–82
C+	2.3	77–79
C	2.0	73–76
D	1.0	65–72
F	0.0	below 65

Some schools don't use plus/minus grades, and a few give an A+ 4.3. Check your student handbook. That one detail can move your GPA by a tenth of a point or more.

If your teacher gives percentages instead of letters, convert them first. A grade calculator makes this quick, and it also shows what you'd need on a final exam to reach a target grade.

Step 2: Unweighted GPA (the simple average)

An unweighted GPA treats every class the same: an A in AP Chemistry and an A in PE are both 4.0.

Formula: add up the grade points and divide by the number of classes.

Example: one semester, six classes

Class	Grade	Points
English 10	A-	3.7
Algebra II	B+	3.3
Biology	A	4.0
US History	B	3.0
Spanish II	A	4.0
PE	A	4.0

Total = 22.0, and 22.0 ÷ 6 = 3.67 unweighted GPA.

Unweighted GPA is good for comparing students across schools because it caps at 4.0 everywhere. The downside is that it doesn't reward taking harder classes.

Step 3: Weighted GPA (rewarding harder classes)

Weighted GPA adds a bonus for advanced coursework. The most common US setup is:

• Regular / college-prep: +0
• Honors: +0.5
• AP / IB / dual enrollment: +1.0

That puts the ceiling at 5.0 instead of 4.0.

Same example, but now English and Biology are Honors and US History is AP:

Class	Level	Base	Bonus	Weighted
English 10	Honors	3.7	+0.5	4.2
Algebra II	Regular	3.3	0	3.3
Biology	Honors	4.0	+0.5	4.5
US History	AP	3.0	+1.0	4.0
Spanish II	Regular	4.0	0	4.0
PE	Regular	4.0	0	4.0

Total = 24.0, and 24.0 ÷ 6 = 4.00 weighted GPA. The unweighted GPA is still 3.67.

Notice that the B in AP History counts as a 4.0 once weighted. That's the trade-off schools are trying to reward: a B in a college-level class is often worth more than an A in an easier one.

Watch out: some schools only add the bonus for grades of C or higher, and some don't weight 9th-grade classes at all. Your school's policy beats any general rule.

If you'd rather not fill out a spreadsheet each semester, this high school GPA calculator handles regular, Honors and AP weighting side by side and shows both numbers at once.

Step 4: Factor in credit hours (college and some high schools)

In college, and at high schools that give semester-long classes less credit than full-year ones, each class counts according to its credits.

Formula: GPA = Σ(grade points × credits) ÷ Σ(credits)

Example: college semester

Course	Credits	Grade	Points	Quality points
Calculus I	4	B	3.0	12.0
Composition	3	A	4.0	12.0
Psychology	3	A-	3.7	11.1
Lab	1	C	2.0	2.0

Quality points = 37.1, credits = 11, and 37.1 ÷ 11 = 3.37 GPA.

A plain average of those four grades would come out to 3.18. The difference is that the 1-credit C barely moves the credit-weighted result. That's why your registrar's number often won't match your own back-of-the-envelope math.

Cumulative GPA: combining semesters

To get a cumulative GPA, don't average your semester GPAs. Add up all the quality points and divide by all the credits. A 4.0 summer term with 3 credits shouldn't count as much as a 3.2 fall term with 16 credits.

Converting GPA for other systems

Students who transfer, apply abroad, or come from schools that use a 10-point CGPA often need to convert between scales. The formulas vary by institution. For example, many Indian universities use CGPA × 9.5 to get a percentage. A CGPA to percentage calculator lets you check the common conversions, but always use the formula your target school publishes.

Common GPA mistakes

1. Averaging semester GPAs instead of recalculating from credits.
2. Using the wrong scale, such as giving A+ 4.3 when your school caps at 4.0.
3. Weighting every advanced class the same, when your school may treat Honors and AP differently.
4. Forgetting pass/fail and withdrawn classes, which usually count toward neither credits nor points.
5. Assuming colleges use your school's weighted GPA. Many recalculate an unweighted core GPA from English, math, science, social studies and world language only.

Which GPA matters more?

It depends on who's reading it:

• Selective colleges usually look at your unweighted GPA together with how hard your classes were. A 3.8 with seven APs reads very differently from a 3.8 with none.
• State scholarships often have a specific GPA cutoff with their own weighting rules. Georgia's HOPE scholarship, for example, recalculates GPA using its own method.
• Class rank is usually based on weighted GPA.

The best plan is to track both numbers each semester, know your school's weighting policy, and take harder classes where you can realistically earn a B or better.

Quick recap

• Unweighted GPA = average of 4.0-scale points, capped at 4.0.
• Weighted GPA = the same, plus +0.5 for Honors or +1.0 for AP/IB, capped at 5.0.
• Credit-weighted GPA = Σ(points × credits) ÷ Σ(credits).
• Cumulative GPA comes from total quality points, not from averaging semester GPAs.

Run your own numbers a few times with real grades and the process will make sense quickly. It also makes it much easier to plan which classes to take next year.