Is the percentage calculator free?

Yes, completely free with no signup required.

All calculations run in your browser. Your file never leaves your browser.

What does 'X% of Y' mean?

It means X percent multiplied by Y. For example, 15% of 200 = 0.15 × 200 = 30.

Use mode 5 (Add %). Enter the original value and the percentage to add. For example, 100 + 10% = 110.

Percentage change = (New - Old) / Old × 100. A positive result is an increase; negative is a decrease.

Calculate percentages instantly. 6 modes including change, add/subtract %, and find what % X is of Y.

🔒 Your file never leaves your browser. All calculations run locally.

Percentage (X)

Value (Y)

1
Choose a calculation mode
Select one of the 6 modes: find X% of Y, find what % X is of Y, percentage change, add/subtract %, or reverse percentage.
2
Enter values
Fill in the input fields. The result and formula update instantly.
3
Copy the result
Click the result to copy it to your clipboard.