Percentage Calculator
Calculate percentages: what is X% of Y, and what percent change occurred.
Enter your numbers and select Calculate to see results.
About This Calculator
This calculator handles the most common percentage questions: finding what a percentage of a number is, finding what percent one number is of another, and finding the percentage change between two numbers.
How This Is Calculated
A is what % of B = (A ÷ B) × 100; % Change = (B − A) ÷ |A| × 100
20 is 25% of 80. Going from 20 to 80 is a 300% increase.
Assumptions
- Percentage change uses A as the starting value and B as the ending value.
Frequently Asked Questions
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Last updated January 15, 2026. Results are estimates for informational purposes only — read our disclaimer.