Percentage Calculator
Solve various percentage-related problems quickly — find percentages, calculate increases, decreases, and more
About What is a Percentage Calculator?
A Percentage Calculator is an essential online tool that instantly solves various percentage-related mathematical problems with precision. Whether you need to calculate discounts, determine exam grade percentages, find tip amounts, or analyze business growth rates, our calculator provides accurate results in seconds.
It features three powerful calculation modes: 'What is X% of Y?' (finding a percentage of a number), 'X is what % of Y?' (reverse percentage calculation), and 'Percentage Increase/Decrease' (calculating growth or reduction).
Your privacy is our priority. All calculations happen directly in your browser without sending any data to external servers. Results are calculated to 4 decimal places for maximum precision.
Key Features of Percentage Calculator
Everything you need for professional percentage calculator
Three-in-One Calculator
Solves three common percentage problems: 'X% of Y', 'X is what % of Y', and percentage change.
Instant & Accurate
Get precise, immediate answers as soon as you click 'Calculate'. No complex formulas to remember.
One-Click Copy
Copy your calculated results to the clipboard with a single click, ready to paste anywhere.
Change Calculation
Find the percentage increase or decrease from an original value to a new value with color-coded results.
Simple & Intuitive
A clean, straightforward interface that makes percentage calculations easy for everyone.
100% Private
All calculations are performed in your browser. Your data never leaves your device.
How to Use Percentage Calculator
Follow these simple steps to get started
Choose Mode
Select from three calculation modes based on what you need to solve.
Enter & Calculate
Input the required values and click 'Calculate' to see your result.
Copy Result
Click the copy button to copy the result to your clipboard.
Pro Tips
- For discounts: Use 'What is X% of Y' where X is the discount % and Y is the original price.
- For tips: Use 'What is X% of Y' where X is 15, 18, or 20 and Y is your bill amount.
- For grades: Use 'X is what % of Y' where X is your score and Y is the total points.
- Green results indicate an increase, red indicates a decrease in percentage change mode.
- Results are calculated to 4 decimal places for maximum precision.
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Frequently Asked Questions
Everything you need to know about Percentage Calculator
A percentage is a number or ratio expressed as a fraction of 100. It is often denoted using the percent sign, '%'. For example, 50% is equal to 50/100, or 0.5.
To find what X% of Y is, use the formula: (X / 100) * Y. For example, 20% of 150 is (20 / 100) * 150 = 30.
To find what percentage X is of Y, use the formula: (X / Y) * 100. For example, 30 is (30 / 150) * 100 = 20% of 150.
Use the formula: ((New - Old) / Old) × 100. Positive result = increase, negative = decrease.
Absolutely! All calculations happen directly in your browser. No data is ever sent to our servers.
Yes! Use 'What is X% of Y' where X is your tip percentage and Y is your bill amount.
Still need help?
Can't find what you're looking for? Our support team is here to assist you.
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