Percentage Calculator: Marks, Percent of a Number and % Change
Work out your marks percentage, find what percent one number is of another, calculate a percentage increase or decrease, or add a percentage to a number. Choose a calculation, enter the numbers and see the answer with the steps.
| Subject (optional) | Marks obtained | Out of | Remove |
|---|
Have only your total? Enter it in the first row, for example 412 out of 500.
How to calculate the percentage of marks
Add up the marks you scored in all subjects, divide by the total maximum marks, and multiply by 100.
Example: you scored 78, 85, 69, 91 and 74 out of 100 in five subjects. Your total is 397 out of 500, so your percentage is 397 ÷ 500 × 100 = 79.4%.
If subjects have different maximum marks (for example 80 for theory and 20 for practical, or a 50-mark subject), enter the right “out of” for each row. The calculator adds the marks and the maximums separately, which gives the correct overall percentage. Averaging the subject percentages instead would give a wrong answer when the maximums are different.
Some boards and universities calculate the percentage only on selected subjects, such as the best five subjects, or have their own rules for grace marks and additional subjects. Follow the rule printed on your mark sheet or in your admission form, and enter only the subjects it asks for.
Percentage formulas with examples
| Question | Formula | Example |
|---|---|---|
| What is X% of Y? | Y × X ÷ 100 | 15% of 2,400 = 2,400 × 15 ÷ 100 = 360 |
| X is what % of Y? | X ÷ Y × 100 | 45 out of 60 = 45 ÷ 60 × 100 = 75% |
| % increase or decrease | (new − old) ÷ old × 100 | 250 to 300 = 50 ÷ 250 × 100 = 20% increase |
| Add X% to a number | Y × (1 + X ÷ 100) | 1,200 + 18% = 1,200 × 1.18 = 1,416 |
| Remove X% from a number | Y × (1 − X ÷ 100) | 1,200 − 18% = 1,200 × 0.82 = 984 |
Common mistakes to avoid
- Percentage points vs percent. If your score goes from 60% to 75%, it rose by 15 percentage points, but by 25 percent (15 ÷ 60 × 100).
- An increase and the same decrease do not cancel out. 100 increased by 10% is 110, but 110 decreased by 10% is 99, not 100.
- Removing a percentage that was already added. To find the price before 18% was added, divide by 1.18. Do not subtract 18%. For tax amounts, use our GST calculator.
- Using the wrong base. A percentage change is always measured from the old (starting) value.
Related tools
CGPA to Percentage Calculator · Attendance Calculator · SGPA Calculator · Mean, Median, Mode & Range Calculator · CAT Percentile Calculator
Frequently asked questions
How do I calculate my percentage out of 500?
Divide your total marks by 500 and multiply by 100. For example, 432 out of 500 is 432 ÷ 500 × 100 = 86.4%. A quick shortcut for 500 is to divide your marks by 5.
How do I calculate the percentage when subjects have different maximum marks?
Add all the marks you got, add all the maximum marks, then divide the first total by the second and multiply by 100. Enter each subject with its own “out of” value and the calculator does this for you.
How do I find what percentage one number is of another?
Divide the part by the whole and multiply by 100. For example, 45 is 75% of 60.
How do I calculate a percentage increase?
Subtract the old value from the new value, divide by the old value, and multiply by 100. A negative answer means a decrease.
Can the percentage be more than 100?
Yes, for comparisons and changes. For example, 150 is 150% of 100, and going from 100 to 250 is a 150% increase. A marks percentage, however, cannot be more than 100, so the calculator warns you if marks obtained are higher than the maximum.
How do I convert CGPA to percentage?
Use our CGPA to Percentage Calculator. It includes the CBSE formula (CGPA × 9.5) and lets you enter your university’s own formula.
About this tool. The calculator uses the standard percentage formulas shown above and shows the working with every answer, so you can check it. Before publishing, we tested every calculation against worked examples, including decimals, negative changes, a starting value of zero and subjects with different maximum marks. Your numbers are not sent to our server.
Last reviewed: October 2026.