Grade Calculator
Enter your assignment grades and their weight to see your overall grade — and find out exactly what you need on a final exam to reach your target.
Assignment grades
Final exam
What is a grade calculator?
A grade calculator works out your overall course grade from the marks you have earned and the weight each one carries. In most courses, assignments, quizzes, tests and a final exam each have a percentage weight — for instance homework 20%, two midterms 40% and a final 40%. This calculator lets you list each piece of work with its grade percentage and its weight, then combines them into a single weighted grade, which is the number that appears on your transcript.
It also solves the reverse problem. If you know your current grade and how much the final exam is worth, you can find the minimum score you need on the final to land on a target grade — sometimes called the "needed on final" or "what do I need to get on the final" calculation. That makes it a practical tool for judging a comeback, deciding whether to tighten up studying, or working out whether a grade is still in reach. All the math runs on JavaScript in your browser, so it is instant and private.
How to use
- Add each assignment, test or quiz that you have a grade for.
- Enter the grade as a percentage and the weight that item carries in the course.
- Set the final exam weight and the overall grade you are aiming for.
- Click Calculate grade to see your weighted grade and the score you need on the final.
How the grade is calculated
Weighted grade = Σ(grade × weight) ÷ Σ(weight) Score needed on final = (target − current × (1 − finalWeight)) ÷ finalWeight
Where finalWeight is the final exam weight expressed as a decimal (for example 40% becomes 0.4).
Example
With the defaults — a 85 worth 40 and a 92 worth 20 — the weighted grade is 87.33 (a letter grade of B). If the final exam is worth 40% and you want a course grade of 90, you need 94% on the final. Break it down: 87.33×0.6 = 52.4, and (90 − 52.4) ÷ 0.4 = 94.0.
Common use cases
- Final exam planning: see exactly what score you need to secure a letter grade.
- Weighted course tracking: keep a running total as grades come in.
- Safety-margin checks: find out whether you can afford a low score on one test.
- Extra credit: model how a bonus assignment affects your overall grade.
Pro tips
- Use consistent weights: enter weights per your syllabus so the normalised result is correct.
- Watch a needed score above 100: it means the target is no longer reachable.
- Model a worst case: drop a few percent off a grade to see how much safety margin you need.
- Re-run as grades land: refresh the input whenever a mark is added to keep the picture current.
FAQ
What is a grade calculator?
A grade calculator computes your overall course grade by combining the grades you have earned with their weights, and can also show what score you need on a remaining assignment or final exam to reach a target grade.
How do I calculate a weighted grade?
Multiply each grade by its weight, add those products, then divide by the total weight. For example, an 85 with weight 40 and a 92 with weight 20 gives (85×40 + 92×20) ÷ 60 = 87.33.
How is the score needed on a final exam calculated?
Using Needed = (Target − Current × (1 − Final Weight)) ÷ Final Weight. If your current grade is 87.33, the final is worth 40% and you want a 90, you need about 94% on the final.
What if the final exam weight is 100%?
The final simply carries the whole course grade, so the score you need equals the target grade itself. The calculator handles this automatically.
What if the weight needed on a final is over 100%?
That means you can no longer reach your target grade even with a perfect score, because your current grades have left too little room. You would need a higher target or a grading change.
Do the weights have to add up to 100?
They do not strictly have to. The calculator uses the total weight to normalise, so you can list any grades and weights and still get a correct overall grade as long as they are consistent.
How do I map a percentage to a letter grade?
Commonly A from 90-100, B 80-89, C 70-79, D 60-69 and F below 60. Many schools assign plus and minus variants, and some use a different scale, so check your syllabus.
Can this calculator handle extra credit?
Yes. Give extra-credit work a weight greater than the sum of the others, or enter a grade above 100, and the overall grade will reflect it.
Is a 50% passing grade common?
In many programmes a 50% is a bare pass, while others use 40% or a letter-grade system. Always follow your institution's specific grading policy.
Is this grade calculator free?
Yes. It runs entirely in your browser and nothing you enter is uploaded or stored.
Related tools
Related searches
grade calculator, weighted grade calculator, final grade calculator, what do I need on the final, grade calculator with weights, gpa calculator, test grade calculator, score calculator, average grade, final exam calculator