How to Calculate Your GPA (Step by Step, With Examples)

Your grade point average is a single number that summarizes your grades, and it follows you through scholarships, honors, graduate applications and sometimes job searches. The good news is that the calculation is simple, and once you know how it works you can also predict how future grades will change it.

This guide shows how to calculate your GPA by hand, with examples. The method below is the one most US colleges use. Schools differ in details, so always check your own official scale.

What GPA measures

GPA stands for grade point average. It is a weighted average, because a course with more credit hours counts more than one with fewer. A grade in a four-credit course moves your GPA more than the same grade in a one-credit course.

Two ideas make the calculation clear:

• Grade points are the numerical value of each letter grade.
• Quality points are the grade points multiplied by the credit hours of the course.

Your GPA is the total quality points divided by the total credit hours.

The common 4.0 scale

Most US colleges use a 4.0 scale. A typical version looks like this, though your school may differ:

Some schools do not use plus and minus grades, and some give an A-plus 4.0 while others give 4.3. Check the grading policy on your registrar's website.

Worked example one: a single semester

Suppose you took four courses:

GPA equals 38.6 divided by 12, which is about 3.22.

Notice that the chemistry course, with four credits, contributed more quality points than the others. Notice too that the C in English, although only one grade, held the average down.

Worked example two: with a lower grade

Take the same courses, but suppose you earned a B in chemistry instead of a B-plus. Chemistry now contributes 3.0 times 4, which is 12.0 quality points, not 13.2. The total falls to 37.4, and the GPA becomes 37.4 divided by 12, about 3.12. A single step down in a four-credit course cost about a tenth of a point, which shows how credit hours weight the average.

What to do about special cases

Real transcripts include situations the basic formula does not cover.

• Pass or fail and audit courses. Most schools do not count these in GPA, though they may count for credit. Check your policy.
• Withdrawals. A W grade usually does not count in GPA.
• Incompletes. An I may convert to a grade later, or to an F if not completed in time.
• Repeated courses. Policies vary: some replace the old grade, some average both and some count both attempts.
• Transfer credits. Often accepted for credit but not included in your GPA at the new school.
• Zero-credit courses. Do not affect the average.

Our guide to retaking a failed course explains how repeats are usually treated, and why you should check your own school's rules.

Calculating by hand or with a tool

Doing the calculation by hand is a good way to understand it, and a quick calculator saves time and catches mistakes. You can use our GPA calculator to enter your courses and see the result, and then compare with your official transcript. Make sure any tool uses your school's scale.

Rounding and precision

Schools usually report GPA to two decimal places, and some round to three. Rounding rules matter at thresholds: a 3.495 may display as 3.50, and a school's policy decides whether it qualifies for a cutoff such as honors. If you are close to a threshold, check whether the school rounds, truncates or uses the exact figure, and which GPA it uses for the cutoff.

Predicting future GPA

Once you know the method, you can plan. For next semester, add the quality points you expect and the credits you plan to take, and calculate the new average, in your head or with a tool. This helps you see how many credits of a particular grade you need to reach a goal. Our guide to cumulative GPA explains how to combine terms.

Common mistakes

1. Averaging the grades without weighting by credits.
2. Using the wrong scale, such as counting an A-minus as 4.0 when your school gives 3.7.
3. Including pass or fail courses that the school excludes.
4. Forgetting repeats or replacements.
5. Rounding too early in the calculation.
6. Trusting an unofficial number over your transcript.

Worked example three: a lighter term with a lab

Now suppose a part-time student took two courses: a four-credit chemistry course with a B (3.0) and a one-credit lab with an A (4.0). Quality points are 4 times 3.0, which is 12, plus 1 times 4.0, which is 4, a total of 16. Total credits are 5, so the GPA is 16 divided by 5, which is 3.2. Notice that the one-credit lab barely moved the average, which is why a small course with a top grade cannot rescue a poor grade in a large one.

Checking your transcript

Once you can calculate GPA by hand, you can verify your transcript. Compare each course's credits and grade points with your school's scale, recompute the totals and check them against the printed GPA. Errors are uncommon, but they happen, for example when a repeat is handled differently from the policy, or a transfer course is counted by mistake. If your figure differs from the official one, ask the registrar to explain before assuming a mistake.

Choosing and checking a calculator

Online calculators are convenient, but they differ. Before you trust one, check that it lets you set the credit hours for each course, that it uses the same grade points as your school and that it handles plus and minus grades correctly. Enter a term you already know, and see whether it matches your transcript. If it does not, the scale is probably different. Our GPA calculator lets you check your numbers, but the official transcript always has the final word.

If you are working with a transcript from another country or a different scale, do not mix systems in the same calculation. Calculate within each scale, and report each one separately, or ask the receiving institution how it wants the information presented. Mixing, for example, a 4.0 scale and a 10-point scale in one average produces a number that has no real meaning, even if the arithmetic is correct.

With a little practice, you will be able to estimate the effect of a grade in your head, which is useful when you are deciding whether to push for an extra point in one course.

The bottom line

GPA is total quality points divided by total credit hours. Convert each grade using your school's scale, multiply by credits, add up and divide. Check special cases, such as repeats and pass or fail, against your school's policy, and use a calculator as a double-check. Knowing the arithmetic lets you plan your grades with confidence.