Percentage Calculator
Calculate percentages instantly: what is X% of Y, X is what % of Y, percentage change. Free, no sign-up.
How to Use
1
Choose a mode
Select what you want to calculate: percentage of, is what percent, or percentage change.
2
Enter values
Type your numbers in the input fields.
3
Get instant results
Results update in real-time as you type, with formula and explanation.
Features
Three Calculation Modes
What is X% of Y, X is what % of Y, and percentage change between two values.
Instant Results
No submit button needed — results update as you type.
Formula Display
See the exact formula used for each calculation.
Copy Results
One-click copy any result to your clipboard.
Frequently Asked Questions
Calculator guides
Recommended Reading
Practical guides matched to this calculator, its inputs, and the result users need to trust.
4 guides