Grade Calculator
Find the score you need on your final exam to reach a target grade, or work out your weighted grade from several scores and their weights. Enter your current grade and the weight of the final, and see what is needed for 90, 80, 70 and 60 percent too.
Grade calculator
How to use the grade calculator – final exam score needed and weighted grade
- Choose what to find. Pick "Score needed on the final exam" or "Weighted grade from several scores".
- For the final exam, enter three numbers. Type your current grade, the weight of the final and the grade you want overall.
- For a weighted grade, enter scores and weights. Fill in a score and its weight on each row, and leave unused rows blank.
- Read the result. The answer shows the score you need or your weighted grade, and flags a target that is out of reach.
Formulas
Needed on the final = (target − current × (1 − w)) ÷ w
Weighted grade = Σ(score × weight) ÷ Σ weight
where w is the weight of the final as a decimal, so 30% is 0.30.
Worked examples
Final exam needed. Your grade is 84%, the final is worth 30% and you want 85%. (85 − 84 × 0.70) ÷ 0.30 = 26.2 ÷ 0.30 = 87.33%.
A harder target. For 90% overall, (90 − 58.8) ÷ 0.30 = 104%, so it cannot be reached without extra credit.
Weighted grade. Scores of 92, 85 and 78 with weights 20%, 30% and 50%: 18.4 + 25.5 + 39 = 82.9%.
What the final can change
The best and worst cases tell you how much is still open. With a current grade of 84% and a 30% final, the lowest possible overall grade is 58.8% and the highest is 88.8%. If your target sits outside that range, you need to change the target, not the study plan. If the final is worth less than 10%, even a perfect score moves your grade only slightly.
Weighted categories
Many courses weight categories such as homework 20%, midterms 30% and a final 50%. Within each category, average the scores first, then weight the category averages. The average calculator helps with the first step. If you only have some categories graded, the calculator reports your grade so far and the weight that is still to come.
Letter grades and GPA
Common US cut-offs are 90, 80, 70 and 60, but plus and minus grades and thresholds differ between schools. To convert letter grades to a grade point average, use the GPA calculator. For the percent maths behind any of this, use the percentage calculator. The tool is a planning aid, and your instructor’s published policy decides the final grade.
Frequently asked questions
How do I calculate the final exam score I need?
Needed score = (target − current × (1 − weight)) ÷ weight, with weight as a decimal. With 84% now, a 30% final and a target of 85%, you need (85 − 84 × 0.7) ÷ 0.3 = 87.33%.
How do I calculate a weighted grade?
Multiply each score by its weight, add the results and divide by the total weight. Scores of 92, 85 and 78 with weights of 20%, 30% and 50% give 82.9%.
What if the needed score is above 100%?
Then the target cannot be reached on the final alone unless there is extra credit. The calculator flags this and shows what the final could do at best.
What if my weights do not add to 100%?
The calculator divides by the total weight entered, so you see your grade so far, and it shows how much weight is still to come.
What letter grade is 90%?
On the common US scale, 90% and above is an A, 80 to 89 is a B, 70 to 79 is a C and 60 to 69 is a D. Schools and teachers vary, so check your syllabus.
Is a weighted grade the same as a plain average?
Only if all weights are equal. When a final counts for 30% and a quiz 5%, the final moves your grade six times as much.
How do I find my grade if I score 0% on the final?
Multiply your current grade by (1 − weight). With 84% and a 30% final, a zero gives 84 × 0.7 = 58.8%. The calculator shows this and the 100% case.
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Sources and references
About this calculator
Written and maintained by Rashid Mehmood, founder of CalcTen. The formulas are unit-tested against hand-worked examples, and the content is reviewed whenever product sizes or guidance change. Last updated 14 November 2026. See our editorial policy.
Results are calculated from the numbers you enter and shown with the working. Rounding is applied only when displaying results. Grade and GPA scales, and weighting rules, vary by school, so confirm with your institution. Read the disclaimer.