Percentage Calculator
Free online percentage calculator. Calculate percentages, percentage change, and percentage of a number instantly.
About This Free Online Percentage Calculator
Our free percentage calculator solves the three questions people ask most: what is X percent of a number, what percent one number is of another, and the percentage increase or decrease between two values. Enter your numbers and the answer appears instantly, with the math handled for you so there is no need to remember the formula or move the decimal point yourself. It is useful for working out discounts and sale prices, tips at a restaurant, tax, exam and grade percentages, commission, and tracking how much a value has gone up or down over time. Each mode is laid out clearly so you can switch between them without confusion. The tool works entirely in your browser, gives results as you type, and requires no signup.
Features of Our Percentage Calculator
- What is X% of Y — find the portion
- X is what % of Y — find the percentage
- Percentage increase/decrease calculator
- Real-time results as you type
- Copy result to clipboard
- 100% private — browser-only processing
How to Use the Percentage Calculator
The Percentage Calculator works right in your browser — no signup, no installation. Follow these steps:
- Select the calculation mode: Find percentage, Find percent, or Percentage change.
- Enter the numbers in the input fields.
- View the result instantly below.
- Click Copy to copy the result to your clipboard.
Frequently Asked Questions About Percentage Calculator
How do I calculate X% of Y?
Use the "What is X% of Y" mode. Enter X as the percentage and Y as the total. The result is (X × Y) ÷ 100.
How do I calculate percentage increase?
Use the "Percentage Change" mode. Enter the original value and the new value. The calculator shows the increase or decrease as a percentage.
Is my data private?
Yes. All calculations happen entirely in your browser. We never see, store, or transmit your numbers.
Why Choose the Percentage Calculator?
The Percentage Calculator is built for answers you can rely on, not rough guesses. Every calculation happens locally in your browser the moment you enter a value, so results are immediate, the math is transparent, and nothing you type ever leaves your device.