FAQ: How to Use This Percentage Calculator?
1. What is a percentage?
A percentage (%) expresses a number as a fraction of 100. For example, 30% means 30 out of 100.
2. How do I calculate X% of Y?
- Enter your percentage (X) and the number (Y) in the first calculator above.
- Click Calculate. It will show the result: (X / 100) × Y.
3. How do I check X is what percent of Y?
- Enter values for X and Y in the second calculator above.
- Click Calculate. It will show the result: (X / Y) × 100%.
4. Percentage Increase/Decrease?
- In the last form, enter a start and end value.
- Click Calculate to see the corresponding percent change: ((End - Start) / Start) × 100%.
5. Is my data stored?
No—your calculations are done only on your device.