Exam Average Calculator

Average a set of test scores, with the option to drop the lowest results.

Please note: Grading rules vary by institution, and many schools round, cap or weight differently. Always confirm against your own syllabus or registrar before relying on a result.

What the Exam Average Calculator does

An exam average is the plain mean of your test scores. Many courses drop the lowest one or two results, which can lift the average noticeably — this shows the effect, along with how consistent your performance has been.

Formula

Average = Σ Scores ÷ Number of scores
After dropping: exclude the n lowest before averaging
Standard deviation = √(Σ(score − mean)² ÷ n)

Inputs explained

Input	Unit	Required	Notes
Test scores	text	Yes	One score per test, as percentages.
Drop this many lowest scores	number	Optional	Accepts 0 or more.
Grade scale	one of 3 options	Yes	Check your syllabus — schools differ on whether an A+ is worth more than an A.

How to use it

Choose Grade scale.
Enter Test scores.
Optionally add Drop this many lowest scores.
Select Calculate.

Worked example

Five tests scoring 78, 85, 92, 67 and 88, dropping the lowest one.

Scores: 78, 85, 92, 67, 88
Drop lowest: 1

All five average 82.0%. Dropping the 67 leaves 78, 85, 92 and 88 — an average of 85.75%, a gain of 3.75 points.

Reading the result

"Standard deviation" and its consistency label reveal something the average alone cannot — two students with the same average can be one steady and one streaky, and only this distinguishes them.
The "average if you dropped more" table shows diminishing returns to dropping further scores — once the worst outliers are gone, dropping more can start removing scores above the current average, which would lower it.

Assumptions and limitations

Every test is treated as equally weighted — if the actual course weights some tests more than others, this average is a diagnostic tool, not what appears on the transcript.
Standard deviation here is a population statistic (dividing by n, not n − 1), which matters if these scores are meant to represent a sample of a larger pattern rather than the complete set being measured.

Common mistakes

Dropping more scores than the syllabus actually allows — the calculator will compute any drop count entered, so the displayed average can overstate the real transcript grade if it exceeds what the course policy actually permits.

Frequently asked questions

Does dropping a low score always help?

It helps whenever the dropped score is below the average, which the lowest score always is unless every score is identical. The weaker the outlier, the bigger the gain.

Should I use the mean or the median?

Courses almost always use the mean. The median is shown because it reveals when one disastrous result is dragging an otherwise solid record down.