Percentage Calculator
Five common percentage sums in one place, with the formula shown.
What do you want to work out?
Your result
—
Enter your numbers to see the result.
This percentage calculator handles the five sums people need most: finding X% of a number, working out what percent one number is of another, percentage increase or decrease, marks percentage, and CGPA to percentage. Pick a mode, type your numbers and the answer appears with the formula used, so you can check it or copy it into your notes.
What is a Percentage Calculator?
A percentage is a number expressed as a part of 100. Saying 18% means 18 out of every 100. Percentages make it easy to compare things of different sizes: a ₹900 discount on a ₹5,000 phone and a ₹4,500 discount on a ₹25,000 laptop are both 18% off.
A percentage calculator saves you from doing the division and multiplication by hand. It is useful for students working out marks, shoppers checking discounts, employees checking a salary hike, and anyone comparing a number this year with last year. This percentage calculator puts the five most common sums in one place and shows the formula with each answer.
How does the Percentage Calculator work?
Every mode uses the same basic idea: a percentage is a ratio multiplied by 100. The calculator simply arranges the numbers differently depending on the question.
For marks, it divides marks obtained by total marks. For X% of Y, it multiplies Y by X/100. For percentage change, it divides the difference by the original value. For CGPA, it uses the CBSE convention of multiplying the CGPA by 9.5.
How to use the Percentage Calculator step by step
- Choose a mode at the top: Marks %, X% of Y, X is what % of Y, % change or CGPA to %.
- Type your numbers into the boxes that appear for that mode.
- Press Calculate or just keep typing; the answer updates on its own.
- Read the formula line under the result to see exactly how the number was worked out.
- Use Copy result to paste the answer elsewhere, or Reset to start again.
Percentage Calculator example with real numbers
A student scores 432 marks out of 500 in board exams and wants the percentage for a college form.
| Example input | Value |
|---|---|
| What do you want to work out? | Marks % |
| Marks obtained | 432 |
| Total marks | 500 |
| Example output | Value |
|---|---|
| Your percentage | 86.40% |
| Marks | 432 out of 500 |
| Formula | (432 ÷ 500) × 100 |
| Typical division | First division with distinction |
| Marks needed for 90% | 18 more |
The percentage calculator divides 432 by 500 and multiplies by 100 to get 86.40%. It also shows how many more marks would have been needed for 90%, which helps when you set a target for the next exam.
Key features of this Percentage Calculator
- Five percentage modes in a single tool
- Marks percentage with the marks still needed for 90%
- CGPA to percentage using the CBSE 9.5 method
- Percentage increase and decrease with the change shown
- Formula shown with every answer
- Works with decimals and negative numbers
- Copy and CSV download
Who should use the Percentage Calculator?
Who is this Percentage Calculator for?
- School and college students calculating marks or converting CGPA
- Parents checking report cards and admission cut-offs
- Shoppers and small sellers working out discounts and price changes
- Office staff preparing reports that compare months or years
Practical use cases
- Finding your board exam percentage for an admission form
- Converting a CGPA of 8.4 into a percentage for a job application
- Working out what 18% of a bill comes to
- Checking how much your electricity bill went up compared with last month
Key benefits
- No formula to remember: pick the question and type the numbers.
- Fewer mistakes: the formula line lets you double-check the answer.
- Quick comparisons: switch modes without leaving the page.
- Works on any phone: large inputs and buttons make it easy to use on mobile.
Tips for better results
- For percentage change, always put the older or starting value in Original value.
- If your university publishes its own CGPA conversion formula, use that instead of the CBSE 9.5 method.
- When a question says “increase by 15%”, use X% of Y and look at the “plus” line in the result.
- Keep a few decimal places in exam percentages; many admission lists rank to two decimals.
Common mistakes to avoid
- Dividing by the new value instead of the original when working out percentage change.
- Adding percentages that apply one after another. A 10% and then 20% discount is 28% off, not 30%; use the discount calculator for that.
- Using CGPA × 9.5 for a university that uses a different conversion.
- Confusing percentage points with percent. A rate going from 8% to 10% is a rise of 2 percentage points, which is 25% in relative terms.
Limitations of this Percentage Calculator
- The CGPA mode uses the CBSE 9.5 multiplier only.
- Division labels for marks are typical guides and vary between boards and universities.
- Results are rounded to two decimal places for display.
- It does not calculate weighted averages across subjects with different credits.
Percentage Calculator vs other ways to calculate
| Method | Speed | Shows formula | Best for |
|---|---|---|---|
| Qorico percentage calculator | Instant | Yes | Everyday percentage questions in one place |
| Phone calculator % key | Fast | No | Simple X% of Y sums |
| Excel or Google Sheets | Medium | If you write it | Large lists of marks or prices |
| Mental maths | Varies | No | Rough estimates |
A phone calculator’s % key works for simple sums but behaves differently on different phones, which leads to wrong answers for percentage change. A spreadsheet is better when you have a whole class list or a price list; use =B2/C2 and format the cell as a percentage.
Privacy and data handling
This Percentage Calculator runs entirely in your browser. The numbers you type are not sent to Qorico or stored on any server, and nothing is saved after you close the page. The Copy and Download buttons create the result on your own device. If the page has analytics turned on, it may count that a calculation happened, but it does not record the values you entered.
Percentage Calculator FAQs
How do I calculate percentage of marks?
Divide the marks you scored by the total marks and multiply by 100. For example, 432 out of 500 is 432 ÷ 500 × 100 = 86.4%. Choose Marks % in the percentage calculator to get it instantly.
How do I convert CGPA to percentage?
Under the CBSE method, multiply your CGPA by 9.5. A CGPA of 8.4 equals about 79.8%. Many universities use their own formula, so check the back of your marksheet.
What is the formula for percentage increase?
Percentage increase = (new value − original value) ÷ original value × 100. If rent rises from ₹40,000 to ₹46,000, the increase is 6,000 ÷ 40,000 × 100 = 15%.
How do I find what percent one number is of another?
Divide the first number by the second and multiply by 100. For example, 45 is 75% of 60 because 45 ÷ 60 × 100 = 75.
Is a 50% increase followed by a 50% decrease the same as no change?
No. 100 increased by 50% is 150, and 150 decreased by 50% is 75. The decrease is applied to a bigger number, so you end up lower than you started.
What is the difference between percent and percentage points?
Percentage points measure the simple gap between two percentages. If an interest rate moves from 8% to 10%, that is 2 percentage points, but it is a 25% increase in the rate itself.
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Sources and references
We checked the method and the current figures used in this Percentage Calculator against these official and primary sources:
- CBSE: Central Board of Secondary Education
- NCERT textbooks: Comparing Quantities (Class 8 Maths)
- UGC: University Grants Commission
Written and reviewed by the Qorico Team
