Grade Calculator

What is a grade calculator?

This grade calculator answers one of the most-searched questions of exam season: what do I need on my final to get the grade I want? You give it three numbers — your current grade, your target overall grade and how much the final is worth — and it tells you the exact score the final has to earn. No spreadsheets, no guessing, and it updates the instant you change any field.

How it works

Your overall grade is a weighted blend of two things: the work you've already done and the final exam. If the final is worth 30% of the course, then everything else is worth 70%. So:

• Your current grade contributes current × (100 − weight) / 100 of the total.
• The final contributes finalScore × weight / 100.

To hit your target, the final has to cover whatever the rest doesn't. Rearranging gives the formula the calculator uses:

required = (desired − current × (100 − weight) / 100) ÷ (weight / 100)

The bigger the final's weight, the more leverage it has — a heavy final can rescue a shaky term, but it can also sink a strong one, which is exactly why it's worth checking the number in advance.

How to use it

1. Enter your current grade as a percentage (the average of everything so far).
2. Enter the grade you want overall, also as a percentage.
3. Enter the final exam weight — the share of your total grade the final is worth, straight from the syllabus.
4. Read the score needed on the final in the headline, plus a plain-English helper line explaining where the number comes from.
5. Use Copy to save the summary, or Clear to start over.

The tool also handles the two edge cases gracefully: if the required score is above 100%, it warns that you may need extra credit; if it's zero or below, it tells you your target is already secured.

A worked example

You're sitting on an 85%, you want to finish with a 90%, and the final is worth 40% of the grade.

• Current work contributes: 85 × (100 − 40) / 100 = 85 × 0.60 = 51 points.
• You need the overall to reach 90, so the final must supply: 90 − 51 = 39 points.
• The final is worth 40%, so as a score: 39 ÷ 0.40 = 97.5%.

So you'd need 97.5% on the final to reach a 90% overall — tough but possible. Drop the target to 88% and the required score falls to 92.5%. If you also want to know how that final grade maps onto a 4.0 GPA, the GPA Calculator does that, and the Percentage Calculator is useful for double-checking any single weighting by hand.

A note on accuracy

The calculator assumes your current grade already reflects all non-final work at its correct weighting, and that the final's weight is stated as a share of the whole course. If your class uses dropped grades, curved scores, or categories that don't simply add up, the real requirement can differ. Treat the result as a clear, fast target and confirm the specifics against your syllabus.

Private by design

Everything is computed in your browser with plain JavaScript. Your grades and target never leave your device — nothing is uploaded, stored or shared, and refreshing the page wipes the fields. Find more study and number tools on the all tools page.