Free Percentage Calculator

Calculate percentages, increases, and discounts. Free, fast, and private—all processing happens in your browser.

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Our percentage calculator helps you solve all common percentage problems quickly and accurately. Whether you need to find a percentage of a number, calculate discounts, or determine percentage changes, this tool has you covered.

Common Percentage Calculations

**Percentage of a Number**: Find what X% of any number is. Useful for tips, discounts, and taxes.

**Percentage Increase/Decrease**: Calculate how much something has changed in percentage terms.

**Percentage Difference**: Compare two numbers and find the percentage difference between them.

**Reverse Percentage**: Find the original number before a percentage was applied.

Real-World Uses

- **Shopping**: Calculate sale discounts and final prices - **Finance**: Determine interest rates and investment returns - **School**: Grade calculations and score analysis - **Business**: Profit margins and growth rates - **Cooking**: Scale recipes up or down

Frequently Asked Questions

How do I calculate a percentage of a number?

To find X% of a number, multiply the number by X and divide by 100. For example, 20% of 150 = (150 × 20) ÷ 100 = 30.

How do I calculate percentage increase?

Percentage increase = ((New Value - Old Value) / Old Value) × 100. For example, going from 80 to 100 is a 25% increase.

How do I calculate percentage decrease?

Percentage decrease = ((Old Value - New Value) / Old Value) × 100. For example, going from 100 to 75 is a 25% decrease.

How do I find what percentage one number is of another?

Divide the first number by the second and multiply by 100. For example, 25 is 50% of 50 (25 ÷ 50 × 100 = 50%).

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