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How to Calculate Your GPA, Step by Step
Your GPA looks like a mysterious number handed down by the school office, but it is one short calculation that you can do on paper in two minutes. Once you can run it yourself, you can also run it forwards: test what a grade would do to your GPA before the term even ends. This guide walks through the standard 4.0-scale calculation step by step, with a worked example, and explains how semester and cumulative GPAs differ.
Step 1: convert each grade to grade points
On the US 4.0 scale every letter grade is worth a fixed number of 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 and F = 0. Schools on the simpler scale skip the plus and minus steps and use A = 4, B = 3, C = 2, D = 1. Write the points next to each course on your list before doing any arithmetic.
Two conversions cause most errors. An F is worth zero points but its credits still count in the final division, which is why one F hurts so much. And a course taken pass/fail is normally excluded from the GPA entirely, both its points and its credits, whatever the outcome.
Step 2: multiply by credits and add up
Each course counts in proportion to its credit hours, so multiply the grade points by the credits for that course. A 4-credit A earns 16 quality points; a 1-credit A earns only 4. Add all the quality points together, and separately add all the credit hours. These two totals are all the GPA formula needs.
In high school, courses usually carry equal weight, often 1 credit or 0.5, so the multiplication is simpler, but the method is identical. If your school weights honours or AP courses on a 5.0 scale, that is a weighted GPA, a different figure covered in our weighted vs unweighted guide.
Step 3: divide, with a worked example
Divide total quality points by total credits. Example: English, A in a 4-credit course = 16.0 points. Mathematics, B+ in a 3-credit course = 9.9 points. History, A- in a 3-credit course = 11.1 points. Science, B in a 4-credit course = 12.0 points. The totals are 49.0 quality points over 14 credits, and 49.0 divided by 14 is exactly 3.50.
Round to two decimal places, the way transcripts report it. You can check any hand calculation, or test a whole transcript at once, with the GPA Calculator on this site, which applies the same steps and lets you switch between the US, Canadian and Australian scales.
Semester GPA vs cumulative GPA
A semester GPA uses only that term's courses. A cumulative GPA pools every term: add all quality points from all terms and divide by all credits attempted. It is not the average of your semester GPAs unless every semester carried identical credits, a subtlety that trips up many hand calculations.
Because the cumulative figure pools everything, it moves more slowly as you progress. A first-year student can swing a cumulative GPA sharply with one strong term; a senior with 110 credits banked will see the same term move it by only a few hundredths. That arithmetic is exactly what the Raise GPA Calculator models when you set a target.
Mistakes that produce a wrong GPA
The four classic errors: forgetting that an F's credits still divide; averaging semester GPAs instead of pooling credits; using weighted 5.0 points in a 4.0 calculation; and including pass/fail or transferred courses that your school excludes. Transfer credits in particular usually count toward graduation but not toward the GPA at the new institution.
If your hand result differs from your transcript by a few hundredths, a rounding or scale difference is the likely cause. If it differs by a lot, one of the four errors above is almost always responsible, and working through the course list line by line will find it.
In short
GPA is quality points divided by credits, nothing more. Convert, multiply, add, divide, and you can reproduce the number on your transcript and, more usefully, predict it: change any grade in the list and the same four steps tell you exactly where you would land.
Last reviewed: November 2026.
Sources & further reading
- College Board BigFuture — How to Calculate Your GPA on a 4.0 Scale — The most widely cited US reference for letter-grade to 4.0-scale conversion.
- National Center for Education Statistics (US Department of Education) — Official US education data on grading, attainment and outcomes.
Related tools
Keep reading: How to Raise Your GPA