Home / Percentage Calculator – Free Online Tool

Percentage Calculator – Free Online Tool

Work out a percentage, compare two values or calculate a discount.

Percentage calculations

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How to use this free online tool

Enter the information or choose the files requested above, then follow the on-screen instructions. Check the result before downloading or using it elsewhere. Fileswin aims to keep supported processing in your browser, which means your device handles the work and performance can vary with file size, available memory and browser support.

About the result

Results are provided as a practical convenience and should be checked when accuracy is important. Exchange rates can move, date calculations depend on the calendar, and document or image output can vary by application. Keep an original copy of important files.

Frequently asked questions

Is this tool free?

Yes. You can use this tool without creating a Fileswin account. Your browser and internet connection may be needed for optional libraries or live data.

Are my files sent to Fileswin?

This tool is designed to process selected content locally in your browser unless a feature clearly indicates that it uses an external service. Avoid using shared devices for confidential information.

Can I use the result commercially?

That depends on the content you provide and any applicable third-party software or service terms. You are responsible for checking those terms before commercial use.

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Percentage, percentage change and discount formulas

To find a percentage of a number, multiply the number by the percentage and divide by 100. To calculate percentage change, subtract the original value from the new value, divide by the absolute original value and multiply by 100. A discount is the original price multiplied by the discount percentage.

How do I calculate a sale price after discount?

Subtract the discount percentage from 100%, then multiply the original price by the remaining percentage. For example, a 20% discount means paying 80% of the original price. Taxes, shipping and store-specific rounding may change the final checkout total.

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