Percentage Calculator
Quick answer: To find X% of Y: multiply Y × (X ÷ 100). Example: 20% of 150 = 150 × 0.2 = 30. Use the calculator below for instant answers — percentages of numbers, increases, decreases and percent change.
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Three common percentage problems, solved instantly. Enter any values below—decimals and negative numbers are supported.
Find a percentage of any number.
Result
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Find what percentage one number is of another.
Percentage
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Measure the percentage change from an old value to a new one.
Percentage change
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How percentages work
A percentage is a number expressed as a fraction of 100. It makes values with different totals easier to compare—from discounts and tips to test scores and business growth.
0.15 × 200 = 3030 ÷ 200 × 100 = 15%(100 − 80) ÷ 80 × 100 = 25%Percentage calculator FAQ
How do I calculate a percentage of a number?
Divide the percentage by 100, then multiply it by the number. For example, 15% of 200 is 0.15 × 200 = 30.
How do I find what percent one number is of another?
Divide the first number by the second number and multiply by 100. For example, 30 is 15% of 200 because 30 ÷ 200 × 100 = 15%.
How is percentage increase or decrease calculated?
Subtract the original value from the new value, divide by the absolute original value, then multiply by 100. A positive result is an increase and a negative result is a decrease.
Can a percentage be greater than 100?
Yes. A percentage above 100 means the amount is greater than the reference amount. For example, 150 is 150% of 100.