Percentage Calculator
Find a percentage of a number, what percent one number is of another, or percent change.
Inputs
Mode
Output
Enter both values to see the result.
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About Percentage Calculator
The Percentage Calculator handles the three percentage questions people ask most often: what is X percent of Y, what percent is X of Y, and by what percentage did a value change. It is useful for discounts, test scores, budgets, price changes and growth figures.
How to use it
- Choose a mode: X% of Y, X is what % of Y, or % change.
- Enter the two values.
- Read the answer in the output panel as soon as both fields are filled in.
Good to know
- X% of Y answers questions like "what is 20% of 150", which gives 30.
- X is what % of Y answers questions like "30 is what percent of 150", which gives 20%.
- % change compares a starting value X with a new value Y. A rise from 50 to 75 is a 50% increase. A change from zero cannot be expressed as a percentage, so the tool reports an error in that case.
Common questions
How do I work out a discounted price?
Use X% of Y to find the discount amount, then subtract it from the original price. For 25% off 80, the discount is 20, so the sale price is 60.
Why is a 50% drop followed by a 50% rise not back to the start?
Each percentage applies to a different base. 100 falls by 50% to 50, and a 50% rise on 50 only adds 25, giving 75.