Grade Average Calculator
Calculate your weighted or simple average grade from multiple subjects or assignments.
Did this tool work for you?
How to use this calculator
Each grade is multiplied by its weight, the products are summed, then divided by the total weight. Without weights, all grades are averaged equally.
- 1
Enter your grades as comma-separated numbers (e.g. 85, 90, 78).
- 2
Optionally enter matching weights as percentages to calculate a weighted average.
- 3
Read your average grade, letter grade, GPA equivalent, and individual highs and lows.
Frequently asked questions
What happens if I leave the weights box empty?
Every grade counts equally. The tool adds the grades and divides by how many there are, and the Method row shows “Simple average”.
The weights I typed are ignored. Why?
Weights are used only when you enter exactly as many weights as grades. If the counts differ (three grades and two weights, say), the tool falls back to a simple average and the Method row says the weights were ignored. Non-numeric entries are dropped from both lists, so a stray word in the grades box can also shift the count.
Do my weights have to add up to 100?
No. The tool divides the weighted sum by the total of the weights you entered, so weights of 60 and 60 behave exactly like 50 and 50. Only the ratios between the weights matter. If the weights total zero, the average shows as 0%.
How is the letter grade chosen?
This tool uses fixed cut-offs on the final average: 90 and above is A, 80 and above is B, 70 and above is C, 60 and above is D, and anything lower is F. There are no plus or minus grades, and 89.9 is a B. Your school’s scale may be different.
Is the GPA Equivalent my real GPA?
No. It is read straight off the letter above (A = 4.0, B = 3.0, C = 2.0, D = 1.0, F = 0.0), so 59.9% gives 0.0 and 90% gives 4.0. A real GPA also depends on credit hours and on your school’s grade-point table; use the Credit Hours & GPA Calculator for that.
Can it drop my lowest score or handle categories like “homework 20%”?
No. It has no drop-lowest option and no category groups. To model a category, average its scores first and enter that average as one grade with the category’s weight.
What does it show when the grades box is empty or unreadable?
A completely empty grades box restores the starting list (85, 90, 78, 92, 88) and shows its average, 86.60%. If the box holds text but no number can be read from it, the result is a single line reading 0%. Percent signs after a number (such as 85%) are fine, because the tool reads the leading number in each entry.
Grade average calculator — simple and weighted averages with letter and GPA
How the average is worked out
Type your grades separated by commas. Without weights, the tool adds them up and divides by the count. With one weight per grade, it multiplies each grade by its weight, adds the products and divides by the sum of the weights. Because it divides by the total weight, the weights do not need to add up to 100. After the average, it reports a letter, a GPA equivalent, the highest and lowest grade, and how many grades it read.
Worked example: the same grades with and without weights
Take grades of 70, 95 and 88. As a plain average they give 84.33%. If the 70 belongs to a test worth 50, the 95 to a quiz worth 20 and the 88 to a project worth 30, the weighted average falls to 80.40%, because the weakest score carries the most weight. Both results land in the B band, but a few points either way can move a result across a cut-off, so run both versions when you are unsure how your course counts things.
| Grades | Weights | Average | Method shown |
|---|---|---|---|
| 85, 90, 78, 92, 88 | none | 86.60% | Simple average |
| 70, 95, 88 | 50, 20, 30 | 80.40% | Weighted average |
| 70, 95, 88 | 50, 50 | 84.33% | Simple average (weights ignored) |
| 92, 78 | 60, 60 | 85.00% | Weighted average |
Mismatched and unusual weights
The third row above is the usual trap: two weights for three grades. The tool does not guess which grade the missing weight belongs to; it ignores the weights and says so in the Method row. The fourth row shows that weights summing to 120 are harmless, since 60 and 60 split the average evenly: (92 + 78) ÷ 2 = 85.00%. Check the Method row every time you use weights.
Letter grades and GPA equivalents used here
The letter comes from the average alone and the GPA equivalent comes from the letter. A single grade of 90 gives A and 4.0, while a single grade of 59.9 gives F and 0.0. The cut-offs below are this tool’s own and may not match how your school converts averages, so treat the letter as a quick label rather than a transcript grade.
| Average | Letter | GPA equivalent |
|---|---|---|
| 90 and above | A | 4.0 |
| 80 to below 90 | B | 3.0 |
| 70 to below 80 | C | 2.0 |
| 60 to below 70 | D | 1.0 |
| Below 60 | F | 0.0 |
What it leaves out
Grades are treated as percentages out of 100, so convert marks such as 17 out of 20 before entering them. There is no drop-lowest rule, no category grouping, no extra-credit cap and no plus or minus grades. For a semester GPA across courses with different credit hours, use a credit-weighted calculator instead.
Learn more from an authoritative source:
WikipediaGPA to Percentage Converter
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Calculate your semester GPA and cumulative GPA from course credit hours and grades.
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Convert your CGPA to percentage using university-specific formulas — supports Anna University, VTU, Mumbai University, SPPU, MAKAUT, and more.
Results are estimates for informational purposes only and do not constitute professional financial, medical, legal, or technical advice. Read full disclaimer →