Percentage Calculator
Solve any percentage problem — what is X% of Y, what percentage is X of Y, or the percentage change between two numbers.
How to use Percentage Calculator
- 1Choose the type of percentage calculation you need.
- 2Enter the required values into the input fields.
- 3The result updates instantly as you type.
About Percentage Calculator
This tool covers the three most common percentage problems: finding a percentage of a number, finding what percentage one number is of another, and finding the percentage increase or decrease between two values.
Percentage Formulas
The first formula finds a percentage of a value. The second finds the percentage increase or decrease between an old and new value.
Benefits
- • Avoid manual calculation errors for everyday percentage problems.
- • Quickly check discounts, markups, and grade or score percentages.
- • See percentage increase or decrease with correct sign (positive for increase, negative for decrease).
Common mistakes
- • Confusing percentage change with percentage points, which are not the same thing.
- • Using the new value instead of the old value as the base when calculating percentage change.
Frequently Asked Questions
Subtract the old value from the new value, divide by the old value, then multiply by 100. This calculator does that automatically for you.
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