Quick percentage calculations
Calculate what percent X is of Y, find percentage change between two values, or compute a percentage of a number instantly.
About This Tool
Percentage Calculator covers the three most common percentage problems: finding a percent of a number, finding what percent one number is of another, and calculating percentage change between two values.
Key Features
Calculate X% of a number
Find what percent X is of Y
Calculate percentage increase or decrease
Decimal precision support
Three calculator modes in one tool
How to Use This Tool
- Enter values in any of the three calculator modes.
- The result updates automatically.
- Switch between modes as needed.
Why Use This Tool
- Handles the three most common percentage problems in one tool.
- No need to remember formulas — just plug in numbers.
- Instant calculations entirely in your browser.
Pro Tips
- Use percentage change to compare sales figures month over month
- Use 'X% of Y' to calculate tips, discounts, and tax amounts
- Negative percentage change means a decrease
Frequently Asked Questions
How is percentage change calculated?
Percentage change = ((New − Old) / |Old|) × 100. A positive result means an increase, negative means a decrease.
Can it handle decimal percentages?
Yes, both input values and results support decimals.
What is a reverse percentage?
A reverse percentage finds what percent one number is of another, e.g. what percent is 25 of 200?