Percentage Calculator
Calculate a percentage of a number, find what percent one number is of another, or measure the percentage change between two values.
What is X% of Y?
Find a percentage of a value.
Result
30
X is what percent of Y?
Find the percentage represented by a part of a whole.
Result
12.5%
Percentage change
Measure the increase or decrease from an original value.
Percentage Change
25%
Change Amount
20
A percentage change from an original value of zero is undefined.
Percentage formulas
Percentage of a value: (value × percentage) ÷ 100
Percent of whole: (part ÷ whole) × 100
Percentage change: ((new value − original value) ÷ original value) × 100
Example calculation
To find 15% of 200, calculate 200 × 15 ÷ 100 = 30. To find the change from 80 to 100, calculate (100 − 80) ÷ 80 × 100 = 25%.
Frequently Asked Questions
What is a percentage?
A percentage is a number expressed as a fraction of 100. For example, 25% means 25 out of every 100.
How do I calculate a percentage of a number?
Multiply the number by the percentage and divide by 100. For example, 20% of 150 is 150 × 20 ÷ 100 = 30.
How do I find what percent one number is of another?
Divide the part by the whole and multiply by 100. For example, 25 is 12.5% of 200.
How do I calculate percentage increase?
Subtract the original value from the new value, divide the change by the original value, and multiply by 100.
What is the difference between percentage change and percentage points?
Percentage change measures relative change from an original value. Percentage points measure the arithmetic difference between two percentages.
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