Percentage Calculator
Calculate percentages quickly and easily.
Calculate a Percentage
What Is a Percentage Calculator?
A percentage calculator is a simple online tool that helps you calculate percentages quickly without doing the math manually. It can be useful for everyday calculations such as finding a percentage of a number, checking percentage increases or decreases, and working out discounts.
Instead of remembering different formulas, you can enter your numbers and get the result in seconds.
For a basic explanation of percentages and related math concepts, you can also refer to Khan Academy’s percentage lessons.
How to Calculate a Percentage
The basic percentage formula is:
Percentage = (Part ÷ Whole) × 100
For example, if you scored 45 marks out of 60:
(45 ÷ 60) × 100 = 75%
So, your score is 75%.
A percentage calculator can make these calculations faster, especially when you need to work with different numbers.
How to Find a Percentage of a Number
To find a percentage of a number, use this formula:
Percentage of a Number = (Percentage ÷ 100) × Number
For example, to find 20% of 500:
(20 ÷ 100) × 500 = 100
So, 20% of 500 is 100.
You can use the calculator above to perform this type of calculation instantly.
How to Calculate Percentage Increase
Percentage increase tells you how much a value has increased compared with its original value.
The formula is:
Percentage Increase = ((New Value − Original Value) ÷ Original Value) × 100
For example, if a product price increases from $80 to $100:
((100 − 80) ÷ 80) × 100 = 25%
The price increased by 25%.
How to Calculate Percentage Decrease
Percentage decrease is used when you want to find how much a value has dropped.
The formula is:
Percentage Decrease = ((Original Value − New Value) ÷ Original Value) × 100
For example, if a price drops from $200 to $150:
((200 − 150) ÷ 200) × 100 = 25%
The price decreased by 25%.
How to Calculate a Discount
Percentages are also commonly used when shopping. To calculate a discount amount, use:
Discount Amount = Original Price × (Discount Percentage ÷ 100)
For example, a $100 item with a 20% discount has a discount amount of:
$100 × 20 ÷ 100 = $20
The final price would therefore be $80.
Common Percentage Examples
Here are some quick examples you can use to understand percentage calculations:
- 10% of 200 = 20
- 15% of 300 = 45
- 20% of 500 = 100
- 25% of 800 = 200
- 50% of 600 = 300
These examples show how percentages can be used for shopping, schoolwork, budgeting, business calculations, and everyday math.
Why Use an Online Percentage Calculator?
Doing percentage calculations manually is easy when the numbers are simple, but larger or more complicated calculations can take more time. An online calculator provides a quick way to check your answer and reduce common calculation mistakes.
You can use this tool when comparing prices, calculating discounts, checking increases or decreases, working with marks and scores, or solving other everyday percentage problems.
For more useful technology guides and practical online tools, check out our Technology Guides section.
Frequently Asked Questions
What is 20% of 500?
20% of 500 is 100.
How do I calculate 10% of a number?
Divide the number by 10. For example, 10% of 250 is 25.
How do I calculate a percentage increase?
Subtract the original value from the new value, divide the result by the original value, and multiply by 100.
Can I use a percentage calculator for discounts?
Yes. A percentage calculator can help you determine the discount amount and understand how much you will pay after a percentage discount.
What is the basic percentage formula?
The basic formula is (Part ÷ Whole) × 100. This formula gives the percentage when you know the part and the whole.
Whether you are checking a discount, comparing prices, calculating marks, or solving a quick math problem, a percentage calculator can save time and make percentage calculations easier.