What score do I need?
Score needed
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Grade Average Calculator
Add subjects with their score and weight to calculate your weighted average — choose the 0-10, 0-20 or 0-100 scale used at your school.
| Subject | Score | Weight |
|---|
Weighted average
- / 10
Total weight0
How a weighted grade average works
A weighted grade average multiplies each subject's score by its weight (credits, hours, or importance), adds the results, and divides by the total weight — subjects with a higher weight affect the average more than subjects with a lower one. This tool supports the 0-10 scale common in Spain and Latin America, the 0-20 scale used in Peru and other countries, and the 0-100 percentage scale.
Weighted average = Σ(score × weight) ÷ Σ(weight)
Looking for the US GPA system (4.0 scale)? Use the GPA Calculator instead.
How do I calculate a weighted grade average?
To calculate a weighted average, multiply each subject's score by its weight, add all the results together, and divide by the sum of the weights. Example: scores of 8, 6 and 9 with weights 3, 2 and 4 give (8×3 + 6×2 + 9×4) ÷ 9 = 8.0.
Steps to calculate your weighted average
- List each subject with its score and its weight (credits, hours, or a percentage that reflects its importance).
- Multiply each score by its weight to get that subject's weighted points.
- Add up the weighted points from every subject.
- Add up the weights from every subject.
- Divide the total weighted points by the total weight to get the weighted average.
Formula
Weighted average = Sum(score × weight) ÷ Sum(weight)
- score = the grade for a subject, on the scale you selected (0-10, 0-20 or 0-100)
- weight = the credits, hours, or relative importance assigned to that subject
- target average = the overall average you want to reach once the remaining weight is included
Example calculations
| Subjects (score × weight) | Total weight | Weighted average |
|---|---|---|
| 8×3, 6×2, 9×4 | 9 | 8.00 |
| 10×2, 10×2 | 4 | 10.00 |
| 5×1, 7×1, 9×1 | 3 | 7.00 |
| Same as above, target 8.5 with 3 more weight | 12 | needs 10.00 |
| 4×5, 8×5 | 10 | 6.00 |
Frequently asked questions
What does 'weight' mean if my school doesn't use credits?
Use whatever number reflects how much that subject or assignment counts toward the final grade — credit hours, class hours per week, or a percentage of the total course. As long as the numbers are proportional to each other, the weighted average comes out the same.
How does the 'score needed' calculation work?
It solves the weighted-average formula backwards: it takes your current weighted total, adds the remaining weight at an unknown score, sets the whole thing equal to your target average, and solves for that unknown score.
What if the score I need is above the maximum of the scale?
That means the target average is not mathematically reachable with the remaining weight, even with a perfect score — you would need either a higher score than the scale allows, more remaining weight, or a lower target.
Is this the same as the American GPA (4.0 scale)?
No. GPA converts letter grades to a 4.0 scale using fixed grade points; this calculator works directly with your school's own numeric scale (0-10, 0-20 or 0-100) without any conversion. Use the GPA Calculator if you specifically need the US 4.0-scale system.
This calculator treats all subjects as contributing to one overall average; it does not model minimum passing thresholds per subject, rounding rules, or grade curves that some institutions apply. Confirm your school's exact grading policy before relying on this result for official purposes.