Percentage Calculator

By the FastFreeTools Editorial Team · Last reviewed: May 2026 · See our Editorial Policy for methodology, sourcing, and disclaimers.

Calculate percentages, percentage change, and percentage differences. Useful for discounts, taxes, and growth rates.

About this tool

Percentage calculations are fundamental to everyday life — from calculating discounts and tips to understanding statistics and financial growth. Our Percentage Calculator handles four common calculation types: finding what percentage one number is of another, calculating a percentage of a given number, finding percentage increase or decrease between two values, and determining the percentage difference. Each calculation includes clear step-by-step results so you can verify the math. Business professionals use it for profit margins and growth rates, students for math homework, and shoppers for understanding sale prices.

How to use Percentage Calculator

Select the type of calculation you need from the tabs.
Enter the required numbers in the input fields.
View the result calculated instantly.
Copy the result for use in your work.

Tips & best practices

Use 'What is X% of Y' for discounts, tips, and taxes.
Use 'Percentage change' for growth rates and performance metrics.
All calculations update instantly as you type.
Results are shown with appropriate decimal precision.

Common use cases

Calculating sale prices and discount amounts while shopping.
Computing tax amounts on purchases and income.
Determining grade percentages for academic assignments.
Analyzing business metrics like profit margins and growth rates.

Privacy

This tool runs entirely in your browser. We do not upload, store, log, or process your input on any server. Open your browser's DevTools Network tab to verify — there is no outbound request with your data. See our Privacy Policy for details.

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