Grade Calculator: Score as a Percentage
Turn points earned into a grade percentage — the figure that maps to a letter grade on an assignment, a test, or a whole course.
Adjust the inputs and select Calculate for a full breakdown.
Compare Common Scenarios
How the numbers shift across typical situations for this calculator:
| Scenario | Percentage | Remaining percentage |
|---|---|---|
| 43 of 50 | 86.00% | 14.00% |
| 88 of 100 | 88.00% | 12.00% |
| 17 of 25 | 68.00% | 32.00% |
| 152 of 180 | 84.44% | 15.56% |
How This Calculator Works
Enter the points you earned and the total points possible. The calculator divides one by the other and multiplies by 100 to give the grade as a percentage, then shows the complement — the percentage of points lost.
The Formula
Part as a Percentage of a Whole
Part is the portion, Whole is the total it belongs to
Worked Example
A score of 43 out of 50 is a grade of 86%. The complement, 14%, is the share of available points that were missed. Whether 86% is a B or a B-plus depends on the grading scale in use.
Key Insight
A percentage grade is universal, but the letter it maps to is not — cutoffs differ between institutions and even between instructors. Always check the specific grading scale before reading a letter into a percentage.
Frequently Asked Questions
How do I calculate my grade percentage?
Divide the points you earned by the points possible, then multiply by 100. A score of 43 out of 50, for example, is 86%.
What letter grade is my percentage?
Letter cutoffs vary by school. A common scale puts 90% and up at A, 80s at B, and 70s at C, but always confirm the scale your course uses.
How do I weight several assignments?
This calculator grades one score. For a weighted course grade, compute each component's percentage, multiply by its weight, and add the weighted results.
What does the remaining percentage mean?
It is the share of available points you did not earn. A grade of 86% means 14% of the possible points were lost.
Can extra credit push a grade above 100%?
Yes. If points earned exceed the points possible, the grade is above 100%. The calculator shows that result rather than capping it.
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Methodology & Review
The grade is the points earned divided by the points possible, multiplied by 100. The complement is the share of points lost. Letter-grade cutoffs vary by institution and are not applied.
Written by Ugo Candido · Last updated May 17, 2026.