Percentage Calculator

About the Percentage Calculator

Percentages are everywhere, from sales discounts and tax rates to stock market changes and school grades. Yet, trying to do these calculations in your head can be confusing. We built this comprehensive Percentage Calculator to be the only tool you need for any percent-related math. Whether you are a student, a shopper, or a business owner, you can get instant, accurate answers without needing to remember complex formulas.

This tool is designed with versatility in mind. It handles the three most common scenarios people face daily. First, you can find a specific percentage of a number (e.g., "What is 20% of 50?"). This is perfect for calculating tips or discounts. Second, you can calculate the percentage change between two numbers. This helps you track growth or decline, like seeing how much your savings increased this month. Finally, you can determine what percent one number is of another, which is great for figuring out test scores or completion rates.

Key Features

• Three Modes in One: Switch easily between finding a percentage, calculating an increase/decrease, and finding a ratio.
• Instant Updates: The results update in real-time as you type, so you don't have to keep clicking a "Calculate" button.
• Formula Breakdown: We don't just give you the answer; we show you the exact math formula used to get it. This is helpful for students learning how to do the math themselves.
• Mobile Friendly: The tool works perfectly on your phone, making it a handy companion for shopping trips or quick office calculations.

How to Use

1. Select Your Calculation: Use the tabs at the top of the calculator to choose what you want to do (e.g., "Percentage Of").
2. Enter Your Numbers: Type your values into the boxes. For example, enter "20" and "100".
3. Get the Result: The answer appears instantly in the blue box on the right (or below on mobile). You will also see the formula used for the calculation below the result.

Frequently Asked Questions

How do I calculate a percentage increase?

To find the percentage increase, subtract the original value from the new value. Then, divide that difference by the absolute value of the original value. Finally, multiply by 100. Our tool does this automatically in the "Percentage Change" tab.

Can I use this for calculating discounts?

Yes. To calculate a discount (like 20% off ), use the "Percentage Of" tab. Enter "20" as the percentage and "50" as the number. The result will be the discount amount (). To find the final price, subtract this amount from the original price.

What if my result is negative?

In the "Percentage Change" mode, a negative result simply means a decrease. For example, if a price drops from 0 to , the result will be -20%, indicating a 20% decrease.

Does this work with decimals?

Absolutely. You can enter precise decimal numbers (like 12.5 or 99.99), and the calculator will handle them accurately.

Is my data private?

Yes. This calculator runs entirely in your web browser. No data is sent to our servers, ensuring your calculations remain private and secure.