ICSE and ISC Percentage: How to Calculate It
In short: the standard method counts English plus your best four other subjects out of 500 for ICSE (Class 10), and English plus your best three other subjects out of 400 for ISC (Class 12). Add the marks, divide by the total and multiply by 100. Admission forms may ask for a different aggregate, so always read what they ask for.
Hinglish me: ICSE me English + best 4 subjects ka total ÷ 500 × 100. ISC me English + best 3 subjects ka total ÷ 400 × 100. Kuch colleges PCM ya PCB ka alag aggregate maangte hain, to form ki instruction zaroor padhein.
Why this question confuses so many students
CISCE marksheets show marks and grades for each subject. A single overall percentage is something schools, colleges and recruiters calculate for forms, and they do not all use the same set of subjects. That is why two people with the same marksheet can quote different percentages. The method on this page is the standard one used on our calculators; the board result, your school and the admission notice always have the final say.
ICSE (Class 10): English + best four, out of 500
Here is a sample marksheet with seven subjects:
| Subject | Marks (out of 100) | Counted? |
|---|---|---|
| English | 84 | Yes (compulsory) |
| Hindi | 78 | No |
| Mathematics | 92 | Yes (one of best four) |
| Physics | 88 | Yes (one of best four) |
| Chemistry | 81 | Yes (one of best four) |
| History & Civics | 76 | No |
| Computer Applications | 95 | Yes (one of best four) |
English is 84. The best four of the others are 95, 92, 88, 81, which add up to 356. Total = 84 + 356 = 440. Percentage = 440 ÷ 500 × 100 = 88.0%.
If you averaged all seven subjects instead, you would get 594 ÷ 7 = 84.86%. The gap of about 3.1 percentage points is why it matters which method a form asks for.
ISC (Class 12): English + best three, out of 400
| Subject | Marks (out of 100) | Counted? |
|---|---|---|
| English | 79 | Yes (compulsory) |
| Physics | 88 | Yes (one of best three) |
| Chemistry | 84 | No |
| Mathematics | 93 | Yes (one of best three) |
| Computer Science | 96 | Yes (one of best three) |
English is 79. The best three of the others are 96, 93, 88 = 277. Total = 79 + 277 = 356. Percentage = 356 ÷ 400 × 100 = 89.00%.
PCM, PCB and other aggregates
Many engineering, medical and university admissions use an aggregate of specific subjects, not the best-four figure. For the same student:
| Method | Working | Result |
|---|---|---|
| Official-style: English + best three, ÷ 400 | 356 ÷ 400 | 89.00% |
| PCM aggregate (Physics, Chemistry, Maths) | 265 ÷ 3 | 88.33% |
| English + PCM | 344 ÷ 4 | 86.00% |
| Average of all five subjects | 440 ÷ 5 | 88.00% |
Enter your subject marks and the calculator picks the best subjects automatically. The ISC page also has a PCM/PCB tick-box aggregate.
ICSE Percentage CalculatorFor Class 12, use the ISC Percentage Calculator.
Step by step: do it on your own marksheet
- List the total marks for every subject (out of 100). Use the figure printed on the marksheet.
- Write down your English marks. It is always counted.
- From the remaining subjects, pick the highest four for ICSE or the highest three for ISC.
- Add English and those marks to get your total.
- Divide by 500 (ICSE) or 400 (ISC), then multiply by 100.
Quick reference: total marks to percentage
| Percentage | ICSE total (out of 500) | ISC total (out of 400) |
|---|---|---|
| 60% | 300 | 240 |
| 70% | 350 | 280 |
| 75% | 375 | 300 |
| 80% | 400 | 320 |
| 85% | 425 | 340 |
| 90% | 450 | 360 |
| 95% | 475 | 380 |
Five mistakes to avoid
- Dividing by the wrong total. ICSE is out of 500 and ISC out of 400 in the best-of method. Dividing by 600 or 800 gives a lower, wrong figure.
- Forgetting that English is compulsory. English is always counted, even if it is not your highest score.
- Counting the same marks twice. Use the subject total as printed. Do not add practical or internal marks again if they are already included in the subject total.
- Mixing up grades and marks. CISCE grades are bands, not exact scores. Use your actual marks whenever you have them.
- Rounding too early. Keep two decimals while calculating and round only at the end, or follow the rounding rule given in the form.
Converting a grade to an approximate percentage
If you only have a grade, the board bands give a rough guide: Grade 1 is roughly 90–100 marks, Grade 2 roughly 80–89, and so on. This is only an estimate. The grade-to-percentage table is on the calculator pages, and the same warning applies there: your actual marks always override a conversion.
Related calculators
Applying for a government job after Class 10? The GDS Percentage Calculator works out the merit percentage used in India Post GDS selection. For other marks and percentages, use the Percentage Calculator or Grade Calculator.
Sources and where to verify
This guide explains a commonly used calculation method and is for planning only. Your school, the board or the recruiting authority publishes the final figure and its rules for counting subjects.
How do I calculate my ICSE percentage?
Add your English marks to your best four other subjects, divide the total by 500 and multiply by 100. For example, 440 ÷ 500 × 100 = 88%.
How do I calculate my ISC percentage?
Add English and your best three other subjects, divide by 400 and multiply by 100. For example, 356 ÷ 400 × 100 = 89%.
Is English compulsory in the percentage calculation?
Yes. In the standard method English is always one of the counted subjects, whatever your score in it.
Why does my college ask for a different percentage?
Admission authorities often use their own rule, such as a PCM or PCB aggregate, or an average of all subjects. Follow the method stated in the admission notice.
Is the calculator result official?
No. It applies the standard method as an estimate. The CISCE result and your institution’s rules are final.