Percentage Calculator
Calculate percentages instantly. Enter two values to get 5 results: X% of Y, X is what % of Y, percentage change, increase, and decrease — all at once.
What is X% of Y?
X is what % of Y?
Percentage Change
About Percentage Calculator
Our percentage calculator shows all five common percentage formulas simultaneously from just two input values. Calculate what percentage one number is of another, find a percentage of a given number, calculate percentage increase or decrease between two values, and find what original value would give a known result. Useful for students, shoppers, business analysis, and everyday calculations.
Frequently Asked Questions
What is X% of Y?
Multiply Y by X divided by 100. For example, 20% of 150 = 150 x 0.20 = 30.
X is what percentage of Y?
Divide X by Y and multiply by 100. For example, 30 is what % of 150 = (30/150) x 100 = 20%.
How do I calculate percentage change?
((New Value - Old Value) / Old Value) x 100. Positive result = increase, negative = decrease.
Is it free?
Yes, completely free, no signup required.