📊 Percentage of a Number Calculator
Quickly calculate what X% of Y is, find what percentage X is of Y, or compute percentage change. Free online tool with instant results and step-by-step explanations.
What is X% of Y?
—
X is what % of Y?
—
Percentage Change (from X to Y)
—
Frequently Asked Questions
How do I calculate a percentage of a number?
Multiply the number by the percentage and divide by 100. For example, 25% of 200 = (25 × 200) / 100 = 50.
How do I find what percentage one number is of another?
Divide the first number by the second and multiply by 100. For example, 50 is what % of 200? (50 / 200) × 100 = 25%.
How do I calculate a percentage increase or decrease?
Percentage change = ((New - Old) / Old) × 100. If the result is positive it's an increase, negative means a decrease.
How do I calculate a discount from a percentage?
Subtract the percentage from 100, then multiply the original price by that result. A 30% discount on $100 = $100 × (100-30)/100 = $70.