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Percentage Calculator
Calculate percentages online, find what percentage one number is of another, or work out percentage increase and decrease.
What is X% of Y?
X is what percent of Y?
Percentage increase or decrease
What is a percentage?
A percentage expresses a value as a part of 100. The percent sign (%) means “per hundred”. Percentages are commonly used for test scores, discounts, budgets, comparisons and changes over time.
Percentage formulas
- Percentage of a number: (percentage ÷ 100) × number.
- What percent: (part ÷ total) × 100.
- Percentage change: ((new value − original value) ÷ original value) × 100.
Examples
20% of 500 is 100. If you score 40 out of 50, your score is 80%. If a price increases from 500 to 600, it increases by 20%.
Frequently asked questions
How do I calculate a percentage?
To find a percentage of a number, divide the percentage by 100 and multiply by the number. For example, 15% of 200 is 30.
How do I calculate percentage increase?
Subtract the original value from the new value, divide by the original value and multiply by 100. The original value must not be zero.
Can a percentage change be negative?
Yes. A negative result indicates a decrease; a positive result indicates an increase.
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