How to Calculate Percentage of Marks: Formula, Examples & Calculator
Your percentage of marks shows how much of the total you scored, on a scale of 100. Schools, universities, and job applications all ask for it. This guide shows how to calculate percentage of marks for one exam, for all subjects together, and for subjects with different maximum marks.
Percentage of marks formula
The percentage of marks formula divides what you scored by the most you could score, then multiplies by 100:
Percentage = (Marks obtained ÷ Total marks) × 100
If you scored 45 out of 60, the percentage is 45 ÷ 60 × 100 = 75 percent.
How to calculate percentage of marks step by step
- Add up the marks you obtained.
- Add up the maximum marks for the same papers.
- Divide the first total by the second.
- Multiply by 100 and round to two decimal places.
That is all there is to how to do percentage of marks, whether you count one paper or ten.
How to find percentage of marks of all subjects
To find the percentage of marks of all subjects, add every subject’s marks first, then apply the formula once. Example with six subjects, each out of 100:
| Subject | Marks obtained | Maximum |
|---|---|---|
| English | 78 | 100 |
| Mathematics | 85 | 100 |
| Science | 92 | 100 |
| History | 67 | 100 |
| Geography | 88 | 100 |
| Computer Science | 74 | 100 |
| Total | 484 | 600 |
Percentage = 484 ÷ 600 × 100 = 80.67%
The percentage of marks calculator does this in one step and also shows the marks you need for a target percentage.
If your school reports a CGPA instead, the CGPA to percentage calculator converts it with your board’s multiplier.
When subjects have different maximum marks
If papers are out of different totals, add the raw marks, not the percentages. Example: 45 out of 50, 72 out of 100, and 160 out of 200.
Percentage = (45 + 72 + 160) ÷ (50 + 100 + 200) × 100 = 277 ÷ 350 × 100 = 79.14%
Averaging the three paper percentages (90, 72, and 80) would give 80.67 percent, which is wrong here, because it gives the 50-mark paper as much weight as the 200-mark paper. Only average percentages when every paper has the same maximum. Adding raw marks is a weighted average in disguise, and the weighted average examples guide shows why the bigger paper counts more.
How to find out the marks you need
To find out the marks needed for a target percentage, reverse the formula:
Marks needed = Target percentage × Total marks ÷ 100
For 75 percent of 600, you need 75 × 600 ÷ 100 = 450 marks. If you already have 290 from four papers, the remaining papers must bring in 160.
Quick percentage of marks reference
| Marks | Out of | Percentage |
|---|---|---|
| 35 | 50 | 70% |
| 420 | 500 | 84% |
| 484 | 600 | 80.67% |
| 650 | 1,000 | 65% |
How to count percentage of marks with a calculator or spreadsheet
On a phone calculator, type the obtained total, divide by the maximum total, and multiply by 100. In Excel or Google Sheets, with obtained marks in B2:B7 and maximum marks in C2:C7, enter =SUM(B2:B7)/SUM(C2:C7)*100 to count the percentage of marks in one step. When papers carry set weights instead of raw totals, follow the steps for a weighted average in Google Sheets.
Common mistakes
- Averaging percentages across different maximums. Add raw marks instead.
- Leaving out practical or internal marks. Include every component that counts toward the total.
- Rounding too early. Round only the final percentage.
Percentages work the same way in shopping and business, and a free online calculator from CalculateGuide handles discounts, decreases, and grades alike.