How to Calculate Your Grade Average and GPA

Your grade point average looks like a simple average but almost never is one. Course credit hours act as weights, and that is what turns a list of percentages into a GPA. This guide covers the conversion, the weighting, and the question students ask most often, which is what to do when one grade is pulling everything down.

A Simple Average Is Not a GPA

If you scored 92 percent in a four credit course and 78 percent in a three credit course, a plain average of 85 percent treats them as equally important. They are not. The four credit course contributes more total points, so your GPA should lean toward the 92.

The Weighted Method Step by Step

Multiply each percentage by its credit hours to get quality points: 92 times 4 is 368, and 78 times 3 is 234. Add them to get 602 quality points. Add the credit hours to get 7. Divide 602 by 7 to get a GPA of 86.0 on the hundred scale. The simple average of 85 is lower, confirming the four credit course was undervalued.

Converting Percentages to a 4.0 Scale

Most institutions convert percentages to grade points before averaging. A common scale is 93 and above for a 4.0, 90 to 92 for a 3.5, 87 to 89 for a 3.0, and so on, with anything below 60 scoring zero. Multiply each grade point by the credit hours, add them, and divide by total credit hours.

Using the Weighted Average Tool Directly

Enter your percentages as the values and your credit hours as the weights in the average calculator, then tick the weighted option. Entering 92 and 78 as values with 4 and 3 as weights gives the weighted result directly. Alternatively, convert to grade points first and enter those with credit hours as weights, which matches how the registrar calculates it.

Finding the Score You Need

With one assignment left, enter the grades you already have as values and their credit hours as weights to get your current weighted standing. Then solve backwards for the score you need on the remaining credit hours to hit your target. A trial and error approach using the calculator is usually faster than algebra.

What to Do About One Bad Grade

Check the median and the mean together. If one low grade is dragging a weighted average down noticeably, the figure is still accurate, but it is not the whole story. Retaking the course, if the institution allows it and the grade can be replaced, is usually the only mechanism that actually moves a GPA.

Do Not Average Percentages From Different Scales

A 90 percent on a 10 question quiz and a 90 percent on a 200 point exam do not carry the same information. Convert each to points earned over points possible before combining them, which is itself a weighted average with the points possible as weights.

How to Calculate Your Average and GPA From Grades