Final Grade Needed Calculator
Heading into finals week, the question is simple: what do I need to score to hit my target? This calculator rearranges the weighted-average grade formula to answer it. Enter your current grade (your average across everything except the final), the course grade you are aiming for, and how much the final is worth. It returns the exact percentage you need on the final, and tells you plainly if the target is already locked in or out of reach.
Final grade needed formula
w = final weight / 100
Needed = (target - current * (1 - w)) / w
Grade with zero on final = current * (1 - w)
Grade with 100 on final = current * (1 - w) + 100 * w
This is the weighted-average grade equation solved for the final exam score. The current grade is treated as the average of all non-final work, weighted by (1 minus the final's weight). Setting the result equal to the target and solving gives the needed score.
Worked example
Your current grade is 88 percent, you want 90 overall, and the final is worth 30 percent (w = 0.30). Needed = (90 minus 88 times 0.70) divided by 0.30 = (90 minus 61.6) / 0.30 = 28.4 / 0.30 = 94.67 percent. So you must score about 94.67 on the final to reach a 90 course grade. Scoring zero would leave you at 61.60; scoring 100 would give 91.60.
Final grade needed: frequently asked questions
How do I work out the grade I need on my final?
Subtract the points your current grade already contributes from your target, then divide by the weight of the final. The formula is: needed = (target minus current times (1 minus final weight)) divided by final weight, where weights are decimals. This calculator does the arithmetic for you.
What if the result is over 100 percent?
If the needed score is above 100 percent, your target is not reachable from your current grade with this final alone, unless extra credit is available. The calculator shows the exact figure so you can see how far out of reach the target is and adjust it to something achievable.
What if the result is zero or negative?
A zero or negative needed score means you have already secured the target: even a zero on the final keeps your course grade at or above the target. The calculator still shows the number so you know exactly how much slack you have.
How do I know my final's weight?
Your syllabus states the weight of each component. If the final is worth 30 percent of the course grade, enter 30. The current grade you enter should be your average across everything except the final, expressed as a percentage.
Sources and method
- Method: the weighted-average grade equation solved for the final exam score, a standard algebraic rearrangement. All weights and grades are user inputs.
- U.S. Department of Education general resources: ed.gov.
Reviewed by the CalculatorHub team, edited by James Graham, 19 June 2026. See our methodology.