Percentage Calculator
Calculate common percentages, discounts, increases, and decreases with two quick formulas.
What is X% of Y?
15% of 200 = 30
Percentage change
+25.00%
🔒 All processing happens in your browser — files never leave your device. Your input stays in this browser and is not uploaded to Smart Online Tools.
How it works
- Enter a percent and number to find the percentage amount.
- Or enter starting and new values to calculate percentage change.
Privacy and processing
Your input stays in this browser and is not uploaded to Smart Online Tools.
Frequently asked questions
What does Percentage Calculator do?
Find a percentage of a number or calculate percentage change. Calculate common percentages, discounts, increases, and decreases with two quick formulas.
Does this tool upload my files or input?
Your input stays in this browser and is not uploaded to Smart Online Tools.