Percentage Calculator
Six small percentage calculators on one page: % of a number, marks percentage, increase or decrease, adding a percent, the price before a percent, and CGPA.
Free, no sign-up. Everything runs in your browser.
What is X% of Y?
20% of 500 = 100
X is what percent of Y? (marks percentage)
432 out of 600 = 72%
Percentage increase or decrease
From 40,000 to 46,000 is a 15% increase
Add or take away a percentage
30,000 + 10% = 33,000
Find the original price before a % was added
Price before 18% = 1,000 (the added part is 180)
CGPA to percentage (CBSE)
CGPA 8.4 x 9.5 = 79.8%. 76% / 9.5 = CGPA 8
Step by step
How to use Percentage Calculator
- 1
Find the right box
Each card answers one kind of question, written as a sentence.
- 2
Type your numbers
Fill in the boxes in the sentence. The answer appears under it as you type.
- 3
Read the answer
Results are shown to two decimals, with the working where it helps.
Overview
About Percentage Calculator
Percent means out of a hundred. To find a percentage of a number, multiply and divide by 100: 20% of 500 = 20 x 500 / 100 = 100. To find what percent one number is of another, divide and multiply by 100: 432 marks out of 600 = 432 / 600 x 100 = 72%.
Percentage change compares a new value with the old one: (new - old) / old x 100. A salary going from ₹40,000 to ₹46,000 is a 15% rise; a price falling from ₹1,200 to ₹900 is a 25% drop. To add a percent, multiply by (100 + percent) / 100; to take it away, by (100 - percent) / 100.
To find a price before a percent was added, such as GST, divide instead of subtracting: ₹1,180 with 18% included was ₹1,000 before. CBSE converts CGPA to percentage by multiplying by 9.5, so a CGPA of 8.4 is 79.8%.
Everything runs in your browser. Nothing you type is sent anywhere.
When it helps
- Working out your marks percentage for a form or admission
- Finding a discount, a tip or a commission
- Checking how much a salary, price or bill went up or down
- Converting a CBSE CGPA to a percentage
Specs
Supported files and limits
- Calculators
- X% of Y, X is what % of Y, % change, add or remove %, price before %, CGPA to % and back
- Numbers
- Decimals, negatives and commas (1,00,000) are accepted
- CGPA
- CBSE rule: percentage = CGPA x 9.5
- Where it runs
- In your browser. Nothing is uploaded.
Percentage formulas
The sum behind each calculator, with an example.
| Question | Formula | Example |
|---|---|---|
| X% of Y | X x Y / 100 | 20% of 500 = 100 |
| X is what % of Y | X / Y x 100 | 432 of 600 = 72% |
| % change from A to B | (B - A) / A x 100 | 40,000 to 46,000 = 15% up |
| Y plus X% | Y x (100 + X) / 100 | 30,000 + 10% = 33,000 |
| Y minus X% | Y x (100 - X) / 100 | 1,500 - 20% = 1,200 |
| Price before X% was added | Price x 100 / (100 + X) | 1,180 with 18% = 1,000 |
| CGPA to % (CBSE) | CGPA x 9.5 | 8.4 = 79.8% |
Good to know
- The CGPA rule is the CBSE one. Universities and other boards use their own formulas; check your marksheet or college rules.
- Results are rounded to two decimals on screen.
Fix a problem
Troubleshooting
Taking 18% off a total does not give the old price
A percent added to a price is a percent of the old price. Use Find the original price before a % was added.
It says the total or starting value cannot be 0
Dividing by zero has no answer. Check that the second box is filled in.
My university uses a different CGPA formula
Use their formula. The 9.5 rule is the CBSE one.
FAQ
Frequently asked questions
How do I calculate the percentage of marks?
Divide your marks by the total marks and multiply by 100. 432 out of 600 = 432 / 600 x 100 = 72%.
How do I find 18% of 2,500?
18 x 2,500 / 100 = 450.
How do I calculate percentage increase?
(New - old) / old x 100. From 40,000 to 46,000: 6,000 / 40,000 x 100 = 15%.
How do I convert CGPA to percentage?
For CBSE, multiply by 9.5. A CGPA of 9 is 85.5%, and 8.4 is 79.8%.
How do I convert percentage to CGPA?
For CBSE, divide by 9.5. 76% is a CGPA of 8.
How do I find the price before GST or a markup?
Divide by (100 + percent) / 100. ₹1,180 including 18% was ₹1,000 before.
Is my data saved?
No. The calculation happens in your browser and nothing is stored or sent.
Explore