How to Calculate Your GPA (Weighted and Unweighted)
Your grade point average, or GPA, is a single number that sums up how well you have done across all of your classes. Almost every high school and university in the United States uses it, and it shows up on transcripts, scholarship applications, honor-roll lists, and college admissions decisions. Because so much can ride on it, it helps to understand exactly where the number comes from instead of treating it as a mystery your school hands down.
The good news is that a GPA is just a weighted average, and the math is something you can do with a calculator in a few minutes. In this guide you’ll learn the standard 4.0 scale, the difference between unweighted and weighted GPAs, and a clear step-by-step method with a fully worked example. By the end you’ll be able to check your own GPA by hand and understand what it actually measures.
What a GPA actually measures
A GPA converts your letter grades into numbers, factors in how much each course is worth, and averages them together. The key idea is that not every class counts equally. A four-credit lecture course carries more weight than a one-credit lab or seminar, so your GPA reflects the size of each course through its credit hours, sometimes called units. This is why two students with the same letter grades can end up with slightly different GPAs when their courses carry different credit values.
The standard 4.0 grade-point scale
On the most common United States scale, each letter grade maps to a number between 0.0 and 4.0. Many schools use pluses and minuses, while others record only whole letters. A typical mapping looks like this:
- A = 4.0 (and, at many schools, A+ = 4.0 as well)
- 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 = 0.0
Not every school uses this exact table. Some drop the plus and minus distinctions so that every A is simply 4.0 and every B is 3.0, and a few tweak the values at the edges. Always check your own school’s official scale, usually printed in the course catalog or student handbook, before you rely on any number.
Unweighted vs weighted GPA
An unweighted GPA puts every course on the same 4.0 maximum, no matter how hard it is. An A is worth 4.0 whether it came from a standard class or a demanding one. This is the simplest version and the one most universities recalculate on their own for admissions.
A weighted GPA gives extra points for tougher courses such as honors, Advanced Placement (AP), or International Baccalaureate (IB). Schools typically add roughly +0.5 for honors and about +1.0 for AP or IB, so an A in an AP class can be worth 5.0 instead of 4.0. That is why some students report GPAs above 4.0. The exact bonus varies from school to school, so a 4.3 at one high school is not automatically the same as a 4.3 at another.
Add your courses and grades and get your GPA on the 4.0 scale instantly — free.
GPA Calculator →How to calculate your GPA step by step
Here is the method that works on any scale. You only need your grades, your credit hours, and the grade-point table above.
- Step 1: Convert each letter grade to its grade-point value (for example, A becomes 4.0).
- Step 2: Multiply each grade point by that course’s credit hours to get its quality points.
- Step 3: Add up the quality points from every course.
- Step 4: Divide the total quality points by the total number of credit hours. That result is your GPA.
Suppose you take four courses this term: English 101 (3 credits, grade A), Calculus I (4 credits, B+), History 101 (3 credits, B-), and Chemistry Lab (1 credit, B). First convert each grade and multiply by its credits to get quality points: A = 4.0 × 3 = 12.0; B+ = 3.3 × 4 = 13.2; B- = 2.7 × 3 = 8.1; B = 3.0 × 1 = 3.0. Next, add the quality points: 12.0 + 13.2 + 8.1 + 3.0 = 36.3. Then add the credits: 3 + 4 + 3 + 1 = 11. Finally, divide: 36.3 ÷ 11 = 3.30. Your GPA for the term is 3.30.
How cumulative GPA works across semesters
The example above is a single-semester GPA. Your cumulative GPA is the same calculation stretched across every semester you have finished. You do not average your semester GPAs directly, because each term may carry a different number of credits. Instead, add up all of the quality points you have ever earned and divide by all of the credit hours you have ever taken.
Say your first semester was 12 credits with a 3.50 GPA, which is 12 × 3.50 = 42.0 quality points. Your second semester was 16 credits with a 3.75 GPA, or 16 × 3.75 = 60.0 quality points. Add them: 42.0 + 60.0 = 102.0 quality points across 28 total credits. Divide: 102.0 ÷ 28 = 3.64. Your cumulative GPA is 3.64 — not the plain average of 3.50 and 3.75, because the two semesters carried different numbers of credits.
Scales differ by country and school
The 4.0 system is standard in the United States, but it is far from universal. Many countries grade on percentages, and others use a 10-point scale, a first-class or second-class honours system, or their own letter bands. Converting between them is not always a clean formula, so if you are applying abroad or transferring credits, use your institution’s official conversion guidance rather than guessing. When in doubt, report your grades in your school’s own system and let the receiving institution convert them.
Once you understand the four steps, a GPA stops being intimidating: convert, multiply, add, and divide. Keep your credit hours accurate and use your own school’s scale, and you can check your number any time you want.
Add your courses and grades and get your GPA on the 4.0 scale instantly — free.
GPA Calculator →