Percentage Calculator
Use this free percentage calculator to quickly calculate percentages, percentage increases and decreases, and find what percentage one number is of another.
Calculate a Percentage
1. What is X% of Y?
2. What Percentage is X of Y?
3. Percentage Increase or Decrease
How to Calculate a Percentage
Calculating a percentage is simple when you use the right formula. A percentage shows a number as a part of 100.
For example, to find 20% of 500:
20 ÷ 100 × 500 = 100
So, 20% of 500 is 100.
Percentage Formula
To calculate a percentage of a number, use this basic formula:
Percentage ÷ 100 × Number = Result
You can use the calculator above to quickly find a percentage without doing the calculation manually.
For more information about mathematical concepts and standards, visit the National Institute of Standards and Technology (NIST).
Percentage Increase and Decrease
Percentage increase and decrease helps you compare an original value with a new value.
For example, if a price increases from $100 to $120, the percentage increase is 20%.
If a price decreases from $100 to $80, the percentage decrease is 20%.
How to Calculate Percentage Change
The basic formula is:
Percentage Change = (New Value − Original Value) ÷ Original Value × 100
A positive result means the value increased, while a negative result means the value decreased.
Our calculator above automatically identifies whether the change is an increase or decrease and calculates the percentage for you.
How to Use the Percentage Calculator
Using the percentage calculator is quick and easy:
Choose the calculation: Select the type of percentage calculation you want to perform.
Enter your values: Enter the numbers required for your calculation.
Click Calculate: The calculator will instantly display your result.
Check your result: Use the result to understand the percentage, increase, decrease, or comparison.
The calculator is useful for everyday calculations such as discounts, price changes, grades, tips, savings, and other percentage-based calculations.
Common Uses of a Percentage Calculator
A percentage calculator can be useful in many everyday situations. You can use it to calculate discounts when shopping, compare price changes, work out tips at restaurants, calculate savings, and understand percentage-based changes in numbers.
Students can use percentage calculations to check grades, test scores, and changes in their results. Businesses and professionals can use percentages to compare sales figures, expenses, profits, growth rates, and other important numbers.
For example, if a product originally costs $80 and is discounted by 25%, the calculator can quickly determine the discount amount and help you understand how much you will save.
Using an online calculator can make these calculations faster and reduce the need to work through formulas manually.
Frequently Asked Questions
A percentage is a way of expressing a number as a part of 100. It is commonly used to compare values, calculate discounts, measure changes, and understand proportions.
Divide the percentage by 100 and multiply it by the number. For example, 20% of 500 is 100.
Subtract the original value from the new value, divide the difference by the original value, and multiply by 100.
Subtract the new value from the original value, divide the difference by the original value, and multiply by 100.
Yes. You can use the calculator to determine a percentage of a price, which can help you calculate discounts and savings.
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