Percentage Calculator
Calculate percentages, percentage change, percentage of a number, and more. Covers all common percentage calculations with formulas and instant results.
Frequently Asked Questions
How do I calculate X percent of a number?
To calculate X% of Y, multiply Y by X and divide by 100. For example, 20% of 150 = 150 * 20 / 100 = 30. The tool does this calculation instantly.
How do I find what percentage one number is of another?
To find what % X is of Y, divide X by Y and multiply by 100. For example, 30 is what % of 150? Answer: (30 / 150) * 100 = 20%.
How is percentage change calculated?
Percentage change = ((New Value - Old Value) / Old Value) * 100. A positive result indicates an increase, while a negative result indicates a decrease.
What is the difference between percentage increase and decrease?
Percentage increase adds a percentage of the original value to get a higher number (e.g., 100 increased by 20% = 120). Percentage decrease subtracts a percentage to get a lower number (e.g., 100 decreased by 20% = 80).