Weighted Grade Calculator
Combine category scores with their weights, such as homework, tests and projects, into one course grade. Includes a worked example and what-if tips.
Results
Weighted grade
- Weights sum
- 100%
OK
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Formula / how it works
Weighted grade = Σ(score × weight) ÷ Σ(weight). With weights that total 100%, the result is the sum of each score multiplied by its weight as a decimal.
Read the guide: GPA and Grade Averaging: Weighted Averages and Final-Exam Targets
Detailed guide
What it is, how to use it, how to read the numbers, common mistakes, a worked example, formulas, and FAQs.
What this calculator is
Most courses do not average every assignment equally. Homework might count for 20%, tests 30%, a project 20% and the final exam 30%. A weighted grade multiplies each category's score by its weight and adds the results. This calculator takes one line per category with the score and weight, checks that weights total 100%, and returns the weighted average. Students use it to check their current standing and run what-if scenarios, and teachers use it to verify grade books. It does not handle dropped scores, extra credit policies or curves unless you build them into your numbers.
When to use / who it helps
- You want your current course grade from category averages.
- You want to see how a future exam score would change your grade.
- You are checking a grade book for errors.
- You are comparing how different weights would affect the outcome.
- You are planning how much effort to put in each category.
How to use
Steps
- Enter one line per category in the form score,weight.
- Use percentage scores and weights that sum to 100.
- Check the weights-sum line to confirm the total is 100%.
- Read the weighted grade.
- Change one score at a time for what-if scenarios.
- Use the final grade needed calculator to solve for a target.
How to interpret results
- Larger weights have larger influence on the result.
- A low score in a heavy category cannot be offset by high scores in light categories.
- If weights do not total 100, the tool flags it so you can fix the inputs.
- Only categories you have scores for should be included, or the grade reflects partial progress.
- Policies such as drops or curves are not modelled.
Common mistakes & gotchas
- Entering weights that do not add up to 100.
- Averaging category scores without weights.
- Mixing points and percentages.
- Counting categories with no score yet as zero when they are pending.
- Rounding category scores before combining.
Worked example
Worked example — four categories
- Homework 92 at 20%: 92 × 0.20 = 18.4.
- Tests 88 at 30%: 88 × 0.30 = 26.4.
- Project 75 at 20%: 75 × 0.20 = 15.0.
- Final exam 90 at 30%: 90 × 0.30 = 27.0. Sum = 86.8.
- If the project were 90 instead of 75, the total would rise by 15 × 0.20 = 3 points to 89.8.
Result: A weighted grade of 86.8%.
To load the form's own demo values, tap Try example above the Calculate button.
How to calculate / formula
Weighted grade = Σ(score × weight) ÷ Σ(weight). With weights that total 100%, the result is the sum of each score multiplied by its weight as a decimal.
Frequently asked questions
How do I calculate a weighted average?
Multiply each score by its weight, add the results, and divide by the total weight.
What if weights do not sum to 100?
Normalise by dividing by the sum, or fix the weights; the tool warns you.
How do I include a pending category?
Leave it out, then the grade reflects only the completed weights.
Does this handle dropped lowest scores?
No. Apply the drop to the category average first.
Can I use letter grades?
Convert them to numbers first, using your school's scale.
How do I find the score I need on the final?
Use the final grade needed calculator.