Not all grades are created equal, and averaging them as if they were is how students misjudge where they stand. This weighted grade calculator multiplies each grade by its weight — a final exam at 50%, coursework at 30%, a quiz at 20%, or university modules by their credit hours — and divides by the total weight. Add or remove rows as your course demands, use any scale your school uses, and compare the result with the simple average shown beside it: the gap between the two is exactly the error the plain average was hiding.
The formula
Weighted average = Σ(grade × weight) ÷ Σ(weights). Each assessment contributes in proportion to how much of the course it decides. The weights do not need to sum to 100: if your syllabus says the exam counts double and the project counts single, enter weights of 2 and 1 — dividing by the total weight (3) normalises them automatically. The same machinery handles university credits: a module’s grade times its credits, summed over modules, divided by total credits, is precisely how most degree classifications and GPA-style averages are built.
Worked example
Final exam 90 with weight 50, coursework 80 with weight 30, quiz 70 with weight 20: weighted average = (90×50 + 80×30 + 70×20) ÷ 100 = (4,500 + 2,400 + 1,400) ÷ 100 = 83.0. The simple average of the same three grades is 80.0 — three full points lower, because it pretends the quiz matters as much as the final. Run the example the other way (a weak final, strong coursework) and the simple average flatters you instead. Neither direction is a rounding issue: it is the same student, the same grades, and two different stories about the course — only one of which your transcript will tell. The credits version works identically: an 85 in a 3-credit module and a 92 in a 4-credit module average to (255 + 368) ÷ 7 = 89.0, not the 88.5 of the simple mean.
Where the weights come from
Your syllabus or module handbook is the only authority: it states each component’s share, and those shares are what the institution will use, whatever an online calculator says. Two traps recur. First, components graded but not yet returned: enter them with an honest estimate (or your target) rather than leaving them out, because omitting a 50% final silently re-weights everything else. Second, scales: this calculator is scale-blind — it works on 0–100, 0–10, 0–20 or letter-converted points as long as every grade and the result you read are on the same scale. If your school converts letters to points (A = 4.0 and so on), convert first, then weight.
Weighted grades — frequently asked questions
What if my weights add up to more or less than 100? Nothing breaks: the calculator divides by the total you entered. Weights of 50, 30 and 20 (total 100) and weights of 5, 3 and 2 (total 10) give the identical average.
Can I use it for a whole degree? Yes — one row per module, grade in one column, credit hours as the weight. That is the standard credit-weighted mean most universities publish.
What grade do I need on the remaining exam? That is a different question — it works backwards from a target. The final exam score calculator on this site answers it directly.
Does a zero count? If the assessment was sat and scored zero, yes: it enters with its full weight, which is exactly why a missed final is so expensive. If it has not happened yet, model it with your target grade instead.
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Versión en español: Calculadora de Promedio Ponderado Ponderación Gratis: tus notas y porcentajes, sin registro · Final Exam Score Calculator · Bell Curve Grade Calculator.
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