To find a marks percentage, divide the marks you got by the maximum marks and multiply by 100: 42 out of 50 is 42 ÷ 50 × 100 = 84%. For several subjects, add all the marks obtained, add all the maximum marks, then divide the first total by the second.
Formula
percentage = marks obtained ÷ maximum marks × 100 Examples
- One test: 17 out of 20 = 17 ÷ 20 × 100 = 85%.
- Five subjects: 412 out of 500 = 82.4%.
Printable: Score to percentage chart
Common mistakes
- Averaging subject percentages when subjects have different maximum marks. Add the marks instead.
- Counting every subject when your school counts only the best ones. Use the optional box for that.
In Excel and Google Sheets
- Marks in A2:A6, maximum marks in B2:B6 (format as %)
=SUM(A2:A6)/SUM(B2:B6)
FAQ
How do I calculate my percentage from total marks?
Divide your total marks by the total maximum marks and multiply by 100. 456 out of 600 is 76%.
How do I find marks from a percentage?
Multiply the percentage by the maximum marks and divide by 100: 85% of 40 is 34.
Is a percentage the same as a grade?
No. Grades and grade boundaries depend on your school or exam board. This calculator gives the exact percentage.
How we calculate: exact decimal math (no rounding errors), you choose the decimal places, and your numbers never leave your browser. Methodology →
Updated October 2026