Free grade calculator calculator
Enter the score and weight for each part of your course — homework, quizzes, the midterm, the final — and this grade calculator returns your overall weighted average grade as a percentage. Heavier components move your grade more, exactly as your syllabus intends, and the result is updated live, as you type.
On this page12 sections
Weighted average of assignment scores. Weights should total 100% for an accurate overall grade.
Results are estimates. Consult a professional.
What is a grade calculator?
A grade calculator works out your overall class grade when different parts of a course count for different amounts. You enter the score you earned on each component — homework, quizzes, the midterm, the final — along with how much each one is worth, and it returns a single weighted average percentage, updated live as you type.
A plain average treats every score equally. But most courses do not: a final exam worth 40% of the grade should pull your overall mark far harder than a quiz worth 5%. A weighted grade calculator respects those weights, so the number you see is the grade your syllabus actually produces — not a misleading straight mean.
How a weighted grade is calculated
A weighted grade is the sum of each score multiplied by its weight, divided by the sum of the weights. Written as a formula:
In plain language: multiply each score by its weight, add those products together, then divide by the total weight. A component with a bigger weight moves your final grade more. If every weight were identical, the result would collapse back into an ordinary average.
- Higher weight = bigger impact. An exam worth 40% changes your grade twice as much as one worth 20% for the same score.
- Low scores in heavy categories hurt most. A poor final exam outweighs several strong quizzes if the final carries more weight.
- The total weight is the denominator. Your grade is measured against the slice of the course you have entered, not against a fixed 100.
A worked example using the grade calculator
Maya has three graded parts left to combine. She scored 90, 80, and 75, and they are worth 0.30, 0.30, and 0.40 of the grade. These are the calculator's default inputs, so you can reproduce every number below.
Step 1 — Multiply each score by its weight
90 × 0.30 = 27.0, then 80 × 0.30 = 24.0, then 75 × 0.40 = 30.0. Each product is the contribution that component makes to the overall grade.
Step 2 — Add the weighted scores together
27.0 + 24.0 + 30.0 = 81.0. This running total is the numerator of the weighted average.
Step 3 — Divide by the total weight
The weights add up to 0.30 + 0.30 + 0.40 = 1.00. Dividing 81.0 by 1.00 gives the final result: 81.00%. The calculator shows this to two decimal places.
| Component | Score | Weight | Score × Weight |
|---|---|---|---|
| 1 | 90 | 0.30 | 27.00 |
| 2 | 80 | 0.30 | 24.00 |
| 3 | 75 | 0.40 | 30.00 |
| Total | — | 1.00 | 81.00 |
81.00 ÷ 1.00 = 81.00%. The weighted grade sits between the lowest (75) and highest (90) score, pulled toward the components carrying the most weight.
Do the weights have to add up to 1 (or 100)?
No. Because the calculator divides by the total of the weights, you can enter them however your syllabus states them — as decimals that add to 1, as percentages that add to 100, or even as raw points. The result is the same as long as the ratios between them stay the same.
| How you enter weights | Scores | Weights | Result |
|---|---|---|---|
| Decimals (sum = 1) | 90, 80, 75 | 0.30, 0.30, 0.40 | 81.00% |
| Percentages (sum = 100) | 90, 80, 75 | 30, 30, 40 | 81.00% |
| Points (sum = 10) | 90, 80, 75 | 3, 3, 4 | 81.00% |
All three rows produce 81.00% because the weights are in the same proportion. Dividing by the total weight normalizes them automatically.
Converting a percentage to a letter grade
This grade calculator reports a percentage, not a letter — because letter-grade cutoffs are set by your school, not by any universal rule. The table below is a common US grading scale you can use to read your percentage off, but always check your own syllabus: many institutions use different thresholds, plus/minus bands, or rounding rules.
| Percentage | Letter | GPA point (typical) |
|---|---|---|
| 93–100% | A | 4.0 |
| 90–92% | A− | 3.7 |
| 87–89% | B+ | 3.3 |
| 83–86% | B | 3.0 |
| 80–82% | B− | 2.7 |
| 77–79% | C+ | 2.3 |
| 73–76% | C | 2.0 |
| 70–72% | C− | 1.7 |
| 67–69% | D+ | 1.3 |
| 60–66% | D / D− | 1.0 / 0.7 |
| Below 60% | F | 0.0 |
A representative US letter-grade scale. Exact cutoffs vary by institution and course — this is a reference, not a fixed standard. An 81.00% lands in the B− band here.
To turn letter grades and credit hours into a grade-point average instead, use the GPA calculator, which applies the 4.0-scale points shown in the last column.
Common grade calculator questions
How do I calculate my grade with weighted categories?
Multiply your score in each category by that category's weight, add up all those products, then divide by the total of the weights. For example, scores of 90, 80, and 75 at weights of 0.30, 0.30, and 0.40 give (27 + 24 + 30) ÷ 1.00 = 81.00%.
What if my weights don't add up to 100?
That is fine. The calculator divides by the total of whatever weights you enter, so percentages that sum to 100, decimals that sum to 1, or raw points all give the same answer as long as the ratios match. If they sum to less than the full course, you get a valid weighted average of the parts you have entered so far.
Does this calculator give me a letter grade?
It returns a percentage. Letter-grade cutoffs differ between schools, so you read the percentage against your own course's grading scale. The reference table above shows one common US scale, where 81% falls in the B− band.
How this calculator works and sources
This grade calculator computes a weighted average: it multiplies each score by its weight, sums the products, and divides by the total weight — the same formula used by standard grade calculators. The arithmetic runs entirely in your browser, nothing is sent anywhere, and the result is shown to two decimal places. The percentage-to-letter table is a representative US scale only; your institution sets the official cutoffs.
Calculator.net — Grade Calculator (weighted grade formula and category weights).RapidTables — Grade Calculator (weighted grade as the sum of weight × grade).CalculatorSoup — Grade Calculator / Weighted Average Calculator.Frequently asked questions about the free grade calculator calculator
About this grade calculator
This grade calculator computes a weighted average — each score times its weight, summed, then divided by the total weight — and runs entirely in your browser. Nothing you type is sent anywhere, and the result updates instantly to two decimal places as you change the scores or weights.
It's one of the education tools on the everyday calculators shelf. For grade-point average from letters and credits use the GPA calculator, to find the score you need on a final use the final grade calculator, or browse everything in the full calculators directory.