🍋 Math Tools
Percentage Calculator
Calculate percentages, increases, decreases, and ratios
chars
words
sentences
lines
Calculation Type
Results
Result
About Percentage Calculator
Four percentage calculation modes: find a percentage of a number, find what percentage one number is of another, calculate percentage change between two values, and add or remove a percentage from a number.
How It Works
Enter two numbers and select a calculation mode. The tool applies the appropriate percentage formula and shows the result with the formula used. Handles decimals and negative numbers.
Step by Step
- 1 Select a calculation mode (What is X% of Y, etc.)
- 2 Enter two numbers in the input fields
- 3 Click Calculate to see the result and formula
Tips
- Use 'Percentage Change' to compare prices or values over time
- To reverse a discount, use 'Add/Remove %' mode
- Works with decimals — enter 12.5 for twelve and a half percent
- Results show the formula used so you can verify the calculation
Frequently Asked Questions
How do I calculate percentage change?
Percentage change = ((new - old) / old) × 100. For example, if a price goes from $80 to $100, the change is ((100-80)/80) × 100 = 25% increase.
What is the difference between percentage of and percentage change?
'Percentage of' finds a portion (20% of 150 = 30). 'Percentage change' measures how much something increased or decreased between two values.