Convert obtained marks and total marks into a percentage with validation for impossible scores.
How to use this calculator
Enter obtained marks and total marks. Total marks must be above zero and obtained marks cannot exceed the total.
Worked example
420 marks out of 500 equals 84%.
Assumptions
Both values use the same marking scale and no weighting or grade conversion is applied.
Limitations
Schools and universities may use weighted assessments, GPA conversions, rounding rules or grading bands that this percentage alone does not represent.