How to Use the Percentage Calculator
- Choose the calculation type that matches your question — there are three cards, one for each mode.
- Enter your numbers into the input fields. Results update instantly as you type.
- The result appears in the colored result box below the inputs.
- Click the Copy button to copy the result to your clipboard.
Use Cases
🛍️
Discounts & Sales
Calculate how much you save on a 30% off sale, or find the final price after a discount.
🎓
Grades & Scores
Find your percentage score on a test, or calculate what grade you need to pass.
📊
Statistics & Data
Calculate percentage distributions, growth rates, and proportions in datasets.
💰
Finance & Investing
Track portfolio growth, calculate interest rates, and measure investment returns.
Key Features
- ✓Three calculation modes in one page — no switching between tools
- ✓Real-time results — answers update instantly as you type, no button needed
- ✓Results rounded to 2 decimal places for clean, readable output
- ✓Percentage change shows increase or decrease with color coding
- ✓Copy button for each result to quickly use values elsewhere
- ✓Empty or non-numeric inputs show a "—" placeholder instead of errors
- ✓Fully responsive — works on mobile, tablet, and desktop