What is the Final Grade Calculator?
This tool tells you the exact score you need on your final exam to finish a course with the grade you're aiming for. Enter the grade you currently hold, the overall target grade you want, and how much the final exam counts toward your total grade. The calculator does the algebra and gives you a single clear number to shoot for.
How to use it
Fill in three fields: your current grade (your weighted average on everything completed so far), your target final grade for the whole course, and the weight of the final exam as a percentage. Click calculate and you'll see the minimum score the final must earn. If the result is above 100%, your target may not be reachable; if it's negative or zero, you've effectively already secured your goal.
The formula explained
Your final course grade is a weighted blend: \(\text{Current} \times (1 - w) + \text{Final} \times w\), where \(w\) is the final's weight as a decimal. Setting that equal to your target and solving for the final score gives:
$$\text{Required} = \frac{\text{Target} - \text{Current} \times (1 - w)}{w}$$
Because we divide by the weight, a small final exam weight makes the required score swing dramatically — a heavy final gives you more room to recover.
Worked example
Suppose your current grade is 85%, you want to finish with 90%, and the final is worth 30% (\(w = 0.30\)). Then $$\text{Required} = \frac{90 - 85 \times 0.70}{0.30} = \frac{90 - 59.5}{0.30} = \frac{30.5}{0.30} = 101.67\%.$$ Since that exceeds 100%, a 90% target isn't quite achievable here — but aiming for 88% would only require about 95% on the final.
FAQ
What if the required score is over 100%? Your target isn't mathematically reachable with that exam alone. Lower your target or look for extra-credit opportunities.
What if it's negative? You've already locked in your target — even a zero on the final keeps you at or above your goal.
What "weight" should I enter? Use the percentage of the total course grade your final exam is worth, as listed in your syllabus (e.g. 25 for 25%).
