Any weight system
Coefficients, course credits or percentages all work — only the ratio of the weights matters, so you never have to make them add up to 100.
Weighted mean · Coefficients & percentages · Grades & GPA · Pass mark · No upload
Weighted Average Calculator
Enter your values and the weight — a coefficient, a number of credits, or a percentage — next to each one, and the weighted average updates live as you type. Each row shows how much of the total weight it carries, so you can see at a glance which entries are pulling the result. The panel below reports the weighted mean alongside the plain simple average for comparison, the total weight, the weighted sum, and a pass / fail check against a mark you set. The bottom card works backwards: tell it the average you want and the weight of one piece still to come, and it finds the value you need to score. Everything runs in your browser — no upload, no sign-up.
Label (optional)ValueWeightWeight share
Weighted average
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Simple average
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Total weight
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Weighted sum Σ(v·w)
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Entries
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Grade still needed
Uses the rows above as your marks so far. Enter the average you are aiming for and the weight of the piece left to do.
To reach an average of
, with a final piece of weight
, you need:
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Ready
Key features
Weighted vs simple
See the weighted mean and the plain average side by side, so you instantly know how much the weighting moved your result.
Pass / fail check
Set a pass mark and a scale, and the result turns green or red so you know where you stand at a glance.
Grade you still need
Work backwards from a target average and the weight of one remaining test to find the exact score required.
Frequently asked questions
How do I calculate a weighted average?
Multiply each value by its weight, add those products, then divide by the sum of the weights: Σ(value × weight) ÷ Σ(weight). For 16 with coefficient 3 and 12 with coefficient 1, that is (16×3 + 12×1) ÷ (3 + 1) = 60 ÷ 4 = 15.
What is the difference between a weighted and a simple average?
A simple average adds the values and divides by how many there are, treating every one equally. A weighted average gives some values more influence through a larger weight or coefficient, so heavier items pull the result toward themselves. When all weights are equal the two are identical.
Do the weights have to add up to 100 or to 1?
No. Weights can be any positive numbers — coefficients like 1, 2, 3, credit hours, or percentages such as 40 and 60. The formula divides by their total, so only the proportion between them changes the answer.
Can I use this as a GPA or grade calculator?
Yes. Put each course grade as the value and its credit hours or coefficient as the weight, and the weighted average is your GPA or semester average. Set the pass mark to your school's threshold to check whether you are above it.
Is my data sent anywhere?
No. Every calculation runs locally in your browser. Nothing is uploaded, and the page keeps working offline once it has loaded.