Final Grade Calculator

With an 85% in the class and a final worth 30%, you need a 101.7% on the exam to get an A. Enter your numbers below to find out exactly what you need.

Works for any weighted grading system: finals, midterms, projects, or any assignment.

Calculator

Current Grade (%)

Target Grade (%)

Final Exam Weight (%)

Score Needed

101.7%

Status

⚠️ Over 100% needed

Final Weight

30% of total grade

The Formula

Required Final Score = (Target Grade - Current Grade x (1 - Final Weight)) / Final Weight

This works because your final grade is a weighted average: Final Course Grade = Current Grade x (1 - Final Weight) + Final Exam Score x Final Weight. We solve this equation for the final exam score.

Sample Scenarios

Current	Target	Final Weight	Score Needed
85%	A (90%)	30%	101.7%
78%	B (80%)	25%	86.0%
92%	A (90%)	40%	87.0%
70%	B- (80%)	20%	120.0%

Worked Example

You have a 78% in Biology and want at least a B (80%). The final is worth 25%.

Required = (80 - 78 x 0.75) / 0.25
= (80 - 58.5) / 0.25
= 21.5 / 0.25 = 86.0%

You need an 86% on the final to finish with a B. That's a challenging but achievable target. Focus your study time accordingly.

Frequently Asked Questions

How do I calculate what I need on my final?

Use the formula: Required Score = (Target Grade - Current Grade × (1 - Final Weight)) ÷ Final Weight. For example, if you have an 85% and want a 90% with a final worth 30%, you need (90 - 85 × 0.70) ÷ 0.30 = 101.7%.

What if I need more than 100% on my final?

If the calculator shows you need over 100%, it means achieving your target grade may not be possible with the final alone. Consider whether extra credit is available, or adjust your target grade to something achievable.

How much is a final exam usually worth?

Final exams typically count for 20-40% of your total grade. Some courses weight them as low as 15% and others as high as 50%. Check your syllabus for the exact percentage.

Does this calculator account for curved grades?

This calculator uses raw percentages. If your professor curves grades, the actual score you need may be lower. Ask your professor about their curving policy before the exam.

Should I focus on my weakest or strongest class?

It depends on your goals. If you're close to a grade boundary (like 89% in a class where 90% is an A), focusing there gives the biggest return. Our calculator helps you see exactly where your effort has the most impact.