Percentage Calculator
Calculate any percentage in seconds. Choose from 4 modes: X% of Y, X is what % of Y, percentage change, or increase/decrease by a percentage.
Select Calculation Type
What is X% of Y?
How to Use
- 1
Choose a calculation type
Select from X% of Y, X is what % of Y, Percentage Change, or Increase/Decrease.
- 2
Enter your numbers
Fill in the input fields. Labels update automatically based on the selected mode.
- 3
See the result instantly
The answer and the formula used appear below the inputs in real time.
Frequently Asked Questions
Select "X% of Y", enter the percentage in the first field and the value in the second. The result is (X / 100) × Y.
Select "X is what % of Y", enter both values, and the tool computes (X ÷ Y) × 100.
Percentage change = ((New − Old) / Old) × 100. A positive result is an increase; negative is a decrease.
The calculator detects division by zero and displays a clear error instead of showing infinity or NaN.
Yes — results are rounded to 2 decimal places for readability.