What the Grade Calculator does
This tool works out your overall weighted grade from a list of scores and how much each one counts. Instead of treating every assignment equally, it lets a final exam pull more weight than a short quiz, which is how most courses actually grade. It helps students checking where they stand before finals, anyone planning the score they need on a remaining test, and teachers double checking a gradebook total. You give it the marks and the weighting, and it returns the single percentage that matters.
How to use it
- Click into the Scores (comma separated) field and enter your marks, for example 90, 85, 78.
- Click into the Weights (comma separated) field and enter the matching weight for each score, for example 20, 30, 50.
- Make sure both lists have the same number of values, lined up in the same order.
- Press Calculate.
- Read the weighted grade as a percentage, along with the total weight so you can confirm your split.
Worked example
Say you scored 90, 85, and 78 with weights of 20, 30, and 50. The math is (90 times 20) plus (85 times 30) plus (78 times 50), which is 1800 plus 2550 plus 3900, giving 8250. Divide that by the total weight of 100 and your weighted grade is 82.5%. Notice how the 78, carrying half the weight, drags the result below a simple average, which is exactly the point of weighting.
Everything runs right in your browser, so your scores stay private and are never uploaded. It is completely free and needs no sign-up.
Frequently asked questions
- How does the weighted grade calculator work?
- It multiplies each score by its matching weight, adds those results together, then divides by the sum of all your weights. That gives a single overall percentage that reflects how much each piece of work counts toward your final grade.
- Do my weights have to add up to 100?
- No. The tool divides by the total weight you enter, so weights like 20, 30 and 50 work the same as 2, 3 and 5. It also reports the total weight so you can confirm the split is what you expected.
- What if I have more scores than weights?
- Each score needs a matching weight in the same position, so enter the same number of values in both fields. If the counts do not line up, fix the lists so every score has one weight before you calculate.
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Last updated: June 17, 2026