Percentage Calculator
Calculate percentages quickly and easily with this free online percentage calculator.
What Is a Percentage?
A percentage is a way of expressing a number as a fraction of 100. The word percentage means "per hundred".
Percentages are commonly used when comparing values, calculating discounts, measuring changes and understanding statistics.
How to Calculate a Percentage
To calculate a percentage of a number, multiply the percentage by the number and divide the result by 100.
What is 20% of 150?
20 × 150 ÷ 100 = 30
Therefore, 20% of 150 is 30.
Percentage Increase
To calculate the percentage increase between an original value and a new value, subtract the original value from the new value, divide the difference by the original value and multiply by 100.
A price increases from $100 to $120.
Increase = $120 − $100 = $20
Percentage increase = 20 ÷ 100 × 100 = 20%
Percentage Decrease
To calculate a percentage decrease, subtract the new value from the original value, divide the difference by the original value and multiply by 100.
A price decreases from $200 to $150.
Decrease = $200 − $150 = $50
Percentage decrease = 50 ÷ 200 × 100 = 25%
Common Uses of Percentages
Percentages are useful in many everyday situations, including shopping discounts, taxes, grades, statistics, financial calculations and comparing changes over time.
Frequently Asked Questions
How do I calculate a percentage of a number?
Multiply the percentage by the number and divide the result by 100.
What is 10% of 100?
10% of 100 is 10.
How do I calculate percentage increase?
Subtract the original value from the new value, divide the difference by the original value and multiply by 100.
Is this percentage calculator free?
Yes. The GetToolly percentage calculator is free to use directly in your web browser.
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