Percentage Calculator
Quickly calculate percentages, increases, and decreases with detailed formulas and history.
Calculator
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Enter values on the left to see instant percentage calculations with breakdown formulas.
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Why Use Our Percentage Calculator?
Percentages are everywhere—from sales tax and store discounts to stock market growth and statistical reports. Our Percentage Calculator is designed to handle all these scenarios effortlessly. Whether you are a student doing homework, a business owner calculating margins, or a shopper looking for a deal, this tool provides instant accuracy without manual math.
Types of Calculations Supported
Percentage of Number
Find what X percent of Y is (e.g., 20% of 500).
Value to Percentage
Determine what percent one number is of another.
Percentage Increase
Calculate the growth percentage between two values.
Percentage Decrease
Find the reduction percentage between two values.
Add Percentage
Add a specific percentage to a base number.
Subtract Percentage
Deduct a percentage from a base number.
Fast, Secure, and Private
We believe your data is yours. This calculator performs all math inside your browser using JavaScript. No information is sent to a server, and your inputs never leave your device. It is lightning fast because it does not require a network round-trip for calculations.
Pro Tip
"Use the 'Record Calculation' button to keep track of your recent results. This history is saved locally in your browser so you can refer back to it during a session."
Percentage Calculator FAQ
To find what percent X is of Y, divide X by Y and then multiply the result by 100. For example, if you want to know what percent 25 is of 200, you do (25 / 200) * 100 = 12.5%.
The formula for percentage increase is: [(New Value - Original Value) / Original Value] * 100. It helps you find how much a value has grown in terms of percentage.
Yes! The formula for percentage decrease is: [(Original Value - New Value) / Original Value] * 100. It shows the relative reduction of a value.
Absolutely. All our calculator tools are 100% free and run entirely in your web browser. We do not charge any fees or require sign-ups.
Yes. Since this is a client-side tool, all calculations happen on your device. We do not store or transmit any of the numbers you enter to our servers.