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Percentage Calculator

Calculate percentages easily. Find what percent of a number is, or find the percentage change between two values.

Result
Please check your inputs.

📖 How to Use This Tool

1. Select the type of calculation you need: 'What is X% of Y?', 'X is what percent of Y?', or 'Percentage change between two values'.
2. Enter the required numbers in the labeled input fields (e.g., the percentage and the whole number, or the initial and final values).
3. Click the 'Calculate' button to instantly see the result displayed on screen.
4. Review the result and, if needed, click the 'Copy' button to copy the answer to your clipboard for sharing or saving.
5. Use the 'Clear' button to reset all fields and start a new calculation.

📝 What Is Percentage Calculator?

A percentage calculator is a simple yet powerful tool that helps you quickly compute percentages without manual math. Whether you need to find what a certain percentage of a number is, determine what percent one number is of another, or calculate the percentage change between two values, this tool does it instantly. Percentages are everywhere—from shopping discounts and tax rates to test scores and financial growth. Having a reliable percentage calculator saves time, reduces errors, and makes everyday decisions easier. It’s especially valuable for students, professionals, and anyone who frequently works with proportions.

🧮 Formula

For 'What is X% of Y?': Result = (X / 100) × Y

For 'X is what percent of Y?': Result = (X / Y) × 100 For 'Percentage change': Result = ((New - Old) / Old) × 100 In plain English: The first formula multiplies the percentage (divided by 100) by the whole number. The second divides the part by the whole and multiplies by 100 to get the percentage. The third subtracts the old value from the new, divides by the old, and multiplies by 100 to show the change as a percentage.

💡 Tips for Best Results

✨🧮 Always double-check your inputs—a small typo can lead to a very different result.
✨📊 Use percentage change to quickly compare growth or decline, like price increases or population changes.
✨💡 For quick mental checks, remember that 10% of a number is the same as dividing by 10.
✨🔖 Bookmark this tool on your browser for instant access whenever you need to calculate percentages.

❓ Frequently Asked Questions

How do I calculate what 20% of 150 is?
Enter 20 as the percentage and 150 as the whole number, then select 'What is X% of Y?'. The tool will multiply 20 by 150 and divide by 100, giving you 30 as the result.
Can I use this tool to find a percentage increase or decrease?
Yes, select the 'Percentage change' option, then input the old value and the new value. The calculator will automatically show you the percentage change, including whether it’s an increase or decrease.
Is this calculator suitable for academic grading, like converting scores to percentages?
Absolutely. For example, if you scored 45 out of 60 on a test, select 'X is what percent of Y?', enter 45 as the part and 60 as the whole, and the tool will instantly return 75%.