Percentage Calculator
Turn marks into a percentage, find marks from a percentage, or see how much your score changed.
How to use the percentage calculator
The calculator has three tabs. Pick the one that matches what you want to find, enter two numbers, and the answer appears on the right as you type.
Choose a tab
Use "Marks to percentage" for your result, "Percentage to marks" to find marks, or "Percentage change" to compare two scores.
Enter two numbers
Fill in both boxes. The labels change with the tab, for example marks obtained and total marks.
Read your answer
See the result, a short label and extra details such as marks lost. Use "Reset" to clear the boxes.
Percentage formulas with examples
Marks to percentage: (Marks obtained ÷ Total marks) × 100
Example: 425 out of 500. 425 ÷ 500 × 100 = 85%.
Percentage to marks: (Percentage ÷ 100) × Total marks
Example: 85% of 1100 marks. 85 ÷ 100 × 1100 = 935 marks.
Percentage change: ((New score − Previous score) ÷ Previous score) × 100
Example: your score went from 60 to 72. (72 − 60) ÷ 60 × 100 = +20%, which is an increase.
Common fractions as percentages
| Fraction | Percentage | Fraction | Percentage |
|---|---|---|---|
| 1/2 | 50% | 9/10 | 90% |
| 3/4 | 75% | 17/20 | 85% |
| 4/5 | 80% | 2/5 | 40% |
| 7/10 | 70% | 1/4 | 25% |
Tip: to compare results from different papers, convert each one to a percentage first. 45 out of 50 and 90 out of 100 are both 90%.
Frequently asked questions
How do I calculate percentage from marks?
Divide the marks you obtained by the total marks and multiply by 100. For example, 425 out of 500 gives 85%. Use the "Marks to percentage" tab to do it instantly.
How do I find marks from a percentage?
Divide the percentage by 100 and multiply by the total marks. For example, 85% of 1100 marks is 935 marks. Use the "Percentage to marks" tab.
How do I calculate percentage increase or decrease?
Subtract the previous score from the new score, divide by the previous score, and multiply by 100. A positive answer is an increase and a negative answer is a decrease. Use the "Percentage change" tab.
Can a percentage be more than 100?
A marks percentage cannot be more than 100 because you cannot score above the total. A percentage change can be more than 100. For example, going from 40 to 100 is a 150% increase.
How is this different from the Marks Calculator?
This tool converts one pair of numbers at a time. The Marks Calculator adds up several subjects, shows your total, average and best subject, and tells you if you passed.
Does this calculator save my information?
No. Everything runs in your browser and nothing is stored or sent anywhere. When you refresh or close the page, your entries are cleared.