What is the difference between the mean and the median?

The mean adds everything and divides by the count. The median is the middle value of the sorted list. They differ when a few scores are much higher or lower than the rest.

Why did the calculator leave out one of my values?

It only accepts plain numbers. Text, negative numbers and values above the maximum score are listed under the input with the reason, so you can fix them.

Average Grade

Average Grade Calculator

Enter your scores separated by commas, spaces or new lines. You get the average percentage, the median, the highest and lowest score and the letter grade on your chosen scale.

Scores (commas, spaces or new lines)

Each score is out of

Average of 5 scores87.6%

GradeB

Mean: 87.6
Median: 88
Highest: 95
Lowest: 79

How to calculate an average grade

Add up all the scores and divide by how many there are: average = sum of scores ÷ number of scores. This is the arithmetic mean, and it treats every score as equally important.

If your categories have different weights, such as exams worth more than homework, a plain average is not your course grade. Use the weighted grade calculator for that.

Mean, median and why both matter

The median is the middle score when the list is sorted. One very low or very high score pulls the mean but barely moves the median, so comparing them shows whether a single outlier is driving your average.

Scores out of different totals should be converted to percentages first. A 9 out of 10 and a 45 out of 50 are both 90%, but averaging 9 and 45 gives a meaningless 27.

Worked example: five test scores

A student scores 88, 92, 79, 95, 84 on five tests.

Sum: 438
Average: 87.6%
Median: 88%
Letter (standard / plus-minus): B / B+

438 ÷ 5 = 87.6%, which is a B on the standard scale.

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