Percentage Calculator
The Percentage Calculator handles three common percentage questions: what a percentage of a number is, what percent one number is of another, and the percentage change between two values.
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How This Tool Works
Choose which type of percentage question you have, enter your numbers, and get an instant result.
Formula & Method
What is X% of Y = (X ÷ 100) × Y. X is what percent of Y = (X ÷ Y) × 100. Percentage change = ((new − original) ÷ original) × 100.
Example Calculation
20% of 150 is 30. Separately, going from 150 to 180 is a 20% increase.
Frequently Asked Questions
What's the formula for percentage change?+
Percentage change = ((new value − original value) ÷ original value) × 100. A positive result is an increase; a negative result is a decrease.
How do I find what percent one number is of another?+
Divide the part by the whole and multiply by 100. For example, 30 is 20% of 150 because 30 ÷ 150 × 100 = 20.
Can percentage change be more than 100%?+
Yes — if a value more than doubles, the percentage increase will exceed 100%. For example, going from 50 to 150 is a 200% increase.
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