Grade Calculator
Convert marks into a percentage and an optional letter grade.
Enter your values
Use the fields below, then select Calculate. Your result appears immediately on this page.
How to use the Grade Calculator
Enter marks obtained and total marks to calculate a percentage. You may also display an example letter grade using the clearly stated built-in scale.
Formula / calculation logic
Percentage = Marks obtained ÷ Total marks × 100.
Worked example
42 out of 50 equals 84%. Under the optional example scale, that corresponds to B.
Important notes
Letter-grade boundaries are not universal. Treat the built-in scale as an example unless it matches your institution.
Frequently asked questions
Can marks obtained exceed total marks?
No. The calculator rejects that as inconsistent input.
Is the letter grade official?
No. Use your school’s published grading scale for official results.