How GPA Is Actually Calculated (In Plain English)

Most students hear their GPA number for years without ever seeing how it's actually built. It's simpler than it looks — here's the whole thing broken down.

Step 1: Every grade becomes a number

Schools convert letter grades into points on a scale, usually out of 4.0. An A is typically worth 4 points, a B is worth 3, a C is worth 2, and so on, with pluses and minuses nudging the number up or down slightly.

Step 2: Each grade gets multiplied by its credit hours

Not all classes count equally. A course worth 4 credit hours affects your GPA more than a course worth 1 credit hour, so each grade's point value gets multiplied by how many credits that class is worth.

Step 3: Add everything up and divide

Add up all those grade-times-credit totals, then divide by your total number of credit hours. That final number is your GPA.

Here's a simple example: say you took two classes — an A (4.0) worth 3 credits, and a B (3.0) worth 4 credits. That's (4×3) + (3×4) = 12 + 12 = 24 total points, divided by 7 total credits, which comes out to a 3.43 GPA.

Why one bad grade in a big class hurts more

Because of that credit-hour multiplication, a low grade in a heavily-weighted class pulls your GPA down more than the same low grade in a small, 1-credit class. This is also why one strong semester in high-credit courses can lift your GPA noticeably.

Try it yourself

Rather than doing this math by hand every semester, our GPA calculator does exactly these three steps for you — just add your courses, grades, and credits, and it handles the rest.