Convert earned and possible marks into percentage, lost marks, and points per mark.
How to use this calculator
For grade percentage calculator, enter Marks earned, Maximum possible marks using the unit or format beside each field. Select Calculate to apply the formula below, review all returned values together, and use Reset to restore the demonstrated inputs before testing another scenario.
Formula & calculation method
Percentage = earned / possible × 100Worked example
Forty-two marks out of fifty produce 84%, with eight marks lost. Earned marks above the maximum are rejected so an invalid score does not appear as normal achievement.
Common mistakes to avoid
- Using zero as maximum marks.
- Entering earned marks greater than possible marks.
- Assuming the percentage determines an official letter grade.
Limitations to keep in mind
The percentage describes one assessment only. It does not apply institutional grade boundaries, weighting, curves, penalties, or rounding rules unless you handle those separately.