How to calculate a grade average
A grade average is the simplest measure of academic performance: the sum of grades divided by their count. This guide explains when a plain arithmetic mean is enough, when you need a credit-weighted average, and includes a worked example matching the grade average calculator.
What the arithmetic mean is
The average = sum of grades ÷ number of grades. It condenses your performance across several subjects or assessments into a single number. The grade average calculator treats every grade equally and also reports the highest and lowest grades alongside the average.
Simple or weighted?
An arithmetic mean gives every subject equal weight. If your courses have different credit hours, a plain average will not reflect that — use the GPA calculator for credit-weighted work. Empty fields are fine here: only the filled grades are counted.
A worked example
Using the calculator’s values: grades 85, 92, 78, 88. The average = (85 + 92 + 78 + 88) ÷ 4 = 343 ÷ 4 = 85.75. Highest 92, lowest 78, and grades counted 4.
Grades from different scales
All grades must be on a single 0 to 100 scale. Mixing a score out of 50 with one out of 100 produces a meaningless average. If you want to combine different maximums, convert the grades to one scale first.
Key takeaways
- Average = sum of grades ÷ number of grades.
- The average here is unweighted — use the GPA calculator for weighting.
- Only filled grades are counted; empty fields are ignored.
- All grades are on a 0 to 100 scale.
Frequently asked questions
Does this calculator account for credit hours?
No, the average here is unweighted. For credit-weighted courses use the GPA calculator.
Can I average grades from different maximums?
No. The mean assumes a uniform 100-point scale; convert different scales to one before averaging.
Related calculators
Grade average calculator
Average your percentage grades, with the highest and lowest, to track academic performance.
GPA calculator
Calculate your GPA on the 4.0 or 5.0 scale from your grades and course credits.
Final grade planner
Find the score you need on the final exam to reach your target overall grade.