How to Calculate Your GPA

GPA stands for grade point average. It rolls all your course grades into one number on a 0 to 4.0 scale. The math is a weighted average, and once you see it once you can repeat it for any semester. Here is how it works, with a worked example.

The short version: turn each letter grade into points, multiply by the course’s credit hours, add those up, and divide by the total credits. Heavier courses count more, which is the whole idea behind weighting.

The 4.0 grade scale

First, each letter grade maps to a point value. This is the standard US scale. Plus and minus marks shift the value by about a third of a point.

• A or A+ is 4.0, and A− is 3.7.
• B+ is 3.3, B is 3.0, and B− is 2.7.
• C+ is 2.3, C is 2.0, and C− is 1.7.
• D+ is 1.3, D is 1.0, and D− is 0.7. F is 0.0.

Why credit hours matter

A GPA is not a plain average of your grades. It is weighted by credit hours, so a four-credit course pulls harder than a one-credit elective. That is why you multiply each grade by its credits before adding.

The product of grade points and credit hours is called quality points. Sum the quality points across every course, then divide by the total credits. The result is your GPA.

A worked example, step by step

Say a semester has four courses with these grades and credit hours: a B+ in a 3-credit class, an A in a 4-credit class, a C+ in a 3-credit class, and a B in a 2-credit class.

1. B+ (3.3) × 3 credits = 9.9 quality points.
2. A (4.0) × 4 credits = 16 quality points.
3. C+ (2.3) × 3 credits = 6.9 quality points.
4. B (3.0) × 2 credits = 6 quality points.

Add the quality points: 9.9 + 16 + 6.9 + 6 = 38.8. Add the credits: 3 + 4 + 3 + 2 = 12. Divide: 38.8 / 12 = 3.23. So the GPA for the semester is about 3.23.

Weighted and unweighted GPA

The example above is an unweighted GPA, where every course tops out at 4.0 no matter how hard it is. Many high schools also report a weighted GPA that adds bonus points for honors, AP, or IB classes, which can push the ceiling to 5.0.

Colleges often recalculate applicant GPAs to their own standard, so the unweighted figure is a reliable common baseline. If your school weights advanced courses, keep both numbers handy and check the official transcript for the weighted version.

Cumulative GPA across terms

Your cumulative GPA spans more than one semester. You do not average the semester GPAs directly, since each term may carry different credits. Instead, add up every course’s quality points across all terms, then divide by the grand total of credits.

This keeps a heavy term from counting the same as a light one. A 14-credit semester rightly has more pull than a 9-credit semester, just as a heavy course outweighs a light one within a term.

A quick way to sanity-check the result

Your GPA should always land between the lowest and highest grade points you earned. In the example, the grades ran from 2.3 to 4.0, and the 3.23 result sits comfortably inside that band. If your answer falls outside the range of your grades, a number went in wrong.

It also leans toward the heavier courses. The 4-credit A pulls the average up, which is why 3.23 sits above the plain grade average of the four marks. Spotting that pull is a good check that the weighting worked.

Common mistakes to avoid

• Averaging the letter grades and ignoring credit hours. GPA is weighted, not a plain average.
• Averaging semester GPAs for a cumulative figure. Use total quality points over total credits instead.
• Mixing your school’s scale with another. Confirm the point values your school assigns to each letter.
• Forgetting that an A+ usually still maps to 4.0 on the common unweighted scale.

Frequently asked questions

What is a good GPA? A 3.0 is generally seen as solid, a 3.5 as strong, and above 3.7 as excellent. What counts as good depends on the program, since competitive majors often expect higher numbers.

Do A+ and A count the same? On the standard 4.0 scale, yes. Both map to 4.0 because the scale caps there. Some schools award 4.3 for an A+, but the common unweighted scale does not.

How do credit hours change my GPA? They act as weights. A high grade in a heavy course lifts your GPA more, and a low grade in a heavy course pulls it down harder than a light course would.

How do I raise my GPA? Strong grades in higher-credit courses move the number most. Because the average includes all past credits, the more credits you carry, the slower a single term shifts it.

Do I need to do this by hand? No. The math is simple to know, but a tool is faster across many courses. Use the one below to add your grades and credits and see your GPA in a second.