A weighted grade combines scores according to their share of the course. Before calculating, identify whether you want the average on completed work or your final course grade. Those are different numbers when part of the course is still ungraded.
Multiply each score by its weight
Suppose homework is 20% of the course, a midterm is 30% and the final is 50%. Scores of 90, 80 and 70 produce 90 × 0.20 + 80 × 0.30 + 70 × 0.50 = 77%. A simple average of the three scores would be 80%, which ignores their different weights.
Use the weighted grade calculator with the weights from your syllabus. The weights for a complete course should normally total 100%; do not invent equal weights when the syllabus specifies otherwise.
Completed average is not the final grade
Before the final exam, the example’s completed assessments contribute 18 + 24 = 42 percentage points toward the course. Their weights total 50%. The average on that completed half is 42 ÷ 0.50 = 84%.
The 84% is the normalized average on completed work. It does not mean you already earned 84 points of the full course. The current calculator normalizes by the total weight entered, so interpret a partial-weight result accordingly. Entering a genuine zero for an assessed item is different from leaving a future item out.
Find the score needed on the final
To finish with 80%, solve 42 + 0.50 × final score = 80. The needed final score is (80 − 42) ÷ 0.50 = 76%. For this example, enter completed average 84, desired final grade 80 and final exam weight 50 in the final grade calculator.
A needed score above 100% indicates the target is not reachable under a strict 0–100 model without extra credit or policy adjustments. A negative needed score means the completed points already exceed that target under the stated assumptions.
Check the grading policy
- Are weights assigned to categories or individual assignments?
- Are marks within a category combined by points or equal averages?
- Are any low scores dropped or assignments exempt?
- Does the course round final grades, and at what stage?
- Are there minimum exam requirements independent of the overall average?
Your syllabus and institution’s rules control those decisions. This guide explains weighted-average arithmetic; it does not replace course-specific grading policy. Keep decimal values until the final step so repeated rounding does not change a borderline estimate.
Content reviewed on 9 October 2026. Worked examples are hypothetical. The original article URL is retained.