Percentage Calculator
Multiple percentage calculation modes — discounts, increases, ratios, and more.
What is X% of Y?
Percentage increase or decrease from Old Value to New Value
X is what percentage of Y?
Calculate sale price after a discount
How to Use
Choose a Calculation Mode
Select from the tabs: basic percentage, percent change, ratio, or discount calculator.
Enter Your Values
Type the numbers in the input fields. Results update automatically as you type.
Read the Result
The answer appears instantly below with the formula used for the calculation.
Frequently Asked Questions
Use the "% Change" tab. Enter the old value and the new value. The formula is: ((New - Old) / Old) × 100. A positive result means increase; negative means decrease.
Use the Discount tab. Enter the original price and the discount percentage. The tool automatically calculates the final price and how much you save.