Average Grade Calculator

What is a grade average, and why simple or unweighted?

A grade average is the single number that sums up a set of scores. In its simplest form it is the unweighted mean, which means every grade counts exactly the same. A quick five-point quiz pulls on your average with the same force as a major exam, because the math gives each score equal say. You add up all the grades and divide by how many you have, and that is your average.

This is different from a weighted grade, where a final exam might count for 40% and homework for 10%, and different again from a GPA, which rolls whole courses onto a 4.0 scale. If your teacher treats every assignment as one of many equal scores, a simple average is exactly what you want, and it is what the calculator above gives you by default.

How the grade average calculator works: the formula

The formula is short enough to remember. The average grade is the sum of all your grades divided by the number of grades.

In math notation that is the arithmetic mean, written as x̄ = Σx_i ÷ n, where the symbol on top means “add every score” and n is the count of scores. You do not need the notation to use it. Here is a worked example with four test scores:

Say you scored 85, 90, 78, and 92. Add them: 85 + 90 + 78 + 92 = 345. That is your sum. You have 4 scores, so divide: 345 ÷ 4 = 86.25%. On a standard scale that rounds to a B. The calculator above runs this exact step on every keystroke, and it shows you the sum and the count alongside the average so you can check the math yourself.

How to use this calculator

You can fill it in under a minute. Add one row for each grade, pick the input mode that matches the marks you have, and read your result as it updates live. There are three modes:

Percentage mode

This is the default. Type each score as a percentage, such as 88 or 91.5, one per row. The calculator adds them, divides by the count, and returns your average percentage along with the matching letter grade and GPA. Use the + Add another score button for as many scores as you need, and Reset to clear everything.

Letters mode

Switch to Letters when your marks come back as A, B+, C, and so on. Pick a letter from A+ down to F in each row. Behind the scenes the calculator converts each letter to its point value, averages the points, and maps the result back to a single averaged letter grade. That averaged letter is the part most tools skip, so you get the answer you actually wanted instead of doing the conversion by hand.

Points mode

Use Points when you have raw scores like 18 out of 20 or 45 out of 50. Enter what you earned and what each item was worth in each row. The calculator totals the points earned and the points possible, then turns that into a percentage and a letter. This mode suits test and quiz scores that are not already expressed as percentages.

Weighted vs unweighted: which do you need?

An unweighted average treats every assignment the same. You add the scores and divide by how many there are, and nothing gets special treatment. A weighted average lets some items count for more, so a final exam worth 40% moves your grade far more than a single homework worth 5%. This calculator does the unweighted version, which is the right one when each score has equal value.

How do you know which your class uses? Check the syllabus. If it lists categories with percentages next to them, like “Tests 50%, Homework 30%, Quizzes 20%,” your grade is weighted, and a simple average would give you the wrong number. If it just lists assignments that all count the same, the simple average here is correct. For the full course breakdown when weights are involved, use our grade calculator and enter the weight for each category.

One more distinction worth keeping straight: a grade average is not a GPA. A grade average combines scores within a single class. A GPA combines whole courses on a 4.0 scale across a semester or a degree. They use different inputs, so do not mix them.

How to average letter grades

Averaging letters is where a lot of calculators give up and tell you to convert everything yourself. You cannot add A and C directly, because letters are not numbers. The fix is a clean four-step method, and the Letters mode above does it for you:

1. Convert each letter to its point value. On the standard 4.0 scale, A = 4.0, B = 3.0, C = 2.0, D = 1.0, and F = 0.0. Plus and minus grades sit between, so a B+ is about 3.3 and a B- about 2.7.
2. Add the points. Total the numbers you just wrote down.
3. Divide by the number of grades. This gives you an average on the same 4.0 scale.
4. Map the result back to a letter. Round to the nearest point value and read off the letter.

Here it is with real grades. Suppose you earned B, A, F, D, and C. Convert: 3 + 4 + 0 + 1 + 2 = 10. Divide by 5 grades: 10 ÷ 5 = 2.0. A 2.0 maps to a C. That single F drags the average down hard, which is honest: a failing grade should hurt.

Percentage, letter, and GPA conversion table

Most US schools use a scale close to the one below. It lets you move between a percentage, a letter, and a grade point without guessing.

Many schools add plus and minus breakpoints inside these bands, so a 97 might be an A+ and an 88 a B+. The exact cutoffs vary from one school to the next, so when a grade sits right on an edge, confirm the line your school actually uses before you trust the letter.

Dropping the lowest grade

Some teachers let you drop your lowest score, usually one bad quiz, so a single off day does not sink your average. The calculator has a drop lowest stepper for exactly this. Set it to the number of low scores your syllabus allows, and the tool removes them before it averages the rest.

Here is what dropping one does. Say your scores are 72, 78, 85, 90, and 88. Averaged as is, they come to 82.6%. Drop the 72 and you average the four that remain: (78 + 85 + 90 + 88) ÷ 4 = 85.25%. The same scores, one fewer counted, and a noticeably better result. One caveat: only drop a grade if your syllabus says you can. Removing a score that actually counts gives you a number that will not match your report card.

Worked examples

A few more runs through the math, with different kinds of scores, so you can see the pattern hold:

• A class of homework scores. You earned 95, 88, 100, 76, and 91 across five assignments. Sum: 450. Count: 5. Average: 450 ÷ 5 = 90%, an A.
• A set of test scores. Three exams came back at 82, 74, and 91. Sum: 247. Count: 3. Average: 247 ÷ 3 = 82.33%, a B.
• A mixed bag of work. A quiz at 100, a project at 85, two homeworks at 90 and 70, and a midterm at 78. Sum: 423. Count: 5. Average: 423 ÷ 5 = 84.6%, a B.

Every one follows the same rule: add the scores, count them, divide. The calculator just spares you the arithmetic and the rounding.

For teachers: averaging a class

The same tool works for a teacher who needs a class average rather than a personal one. Put one student’s overall score in each row and the calculator returns the mean for the whole group. Every student counts once, with equal weight.

For example, four students finish a unit with 90, 95, 100, and 80. Sum: 365. Count: 4. The class average is 365 ÷ 4 = 91.25%. You can add a row per student for a full roster, and if one score is an outlier you want to set aside, the drop lowest stepper lets you see the class average with and without it. The result is a quick class mean without opening a spreadsheet.

What grade do I need? What-if planning

Sometimes the question is not what your average is now but what you need to hit a target. The calculator’s what-if mode answers that. Enter the scores you already have, set the average you are aiming for, and tell it how many items are left. It works out the score you still need on the remaining work.

Say you have three grades averaging 84% and one assignment left, and you want to finish at 86%. The tool tells you the mark you need on that last piece to get there. It is the fastest way to know whether your goal is within reach or whether you need to adjust it, and it saves you from guessing before the marks are locked in.

Common mistakes to avoid

• Averaging weighted categories as if they were equal. If your syllabus weights tests more than homework, a simple average is wrong. Use a weighted calculator instead.
• Mixing percentages and letters without converting. Pick one input type for the whole calculation. Convert letters to points first, or enter everything as percentages.
• Forgetting that missing assignments usually count as zero. A skipped assignment is often a 0 in the gradebook, and a 0 pulls your average down far more than a low pass.
• Confusing your GPA with your course average. They are calculated differently. A course average lives inside one class; a GPA spans many.
• Dropping a score the syllabus does not let you drop. It gives you a friendlier number that your teacher will not honor.
• Counting extra credit twice or above the cap. Add bonus points where your gradebook adds them, and remember some classes cap a grade at 100%.