What is X% of Y?
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X is what % of Y?
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Percentage Change
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Increase/Decrease by %
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Common Percentage Formulas
Percentage of a Number
X% of Y = (X / 100) × Y
Find Percentage
X is what % of Y = (X / Y) × 100
Percentage Change
((New - Old) / Old) × 100
What This Tool Does
Calculate percentages, increases, decreases, and ratios instantly.
This percentage calculator handles all common percentage calculations instantly. Calculate what percentage one number is of another, find percentage of a number, compute percentage increase or decrease, and more.
When to Use This Tool
- Calculate discounts and sale prices
- Find percentage increase or decrease
- Compare values as percentages
- Solve homework or business calculations
How to Use
- Choose calculation type
- Enter your values
- See instant results
Frequently Asked Questions
How do I calculate percentage of a number?
To find X% of Y, divide X by 100 and multiply by Y. For
example, 20% of 150 is (20 ÷ 100) × 150 = 30.
How do I calculate percentage increase?
Percentage increase is calculated as ((New Value - Old
Value) ÷ Old Value) × 100. For example, if a price goes from $80 to $100, the
increase is 25%.
What's the difference between percentage and percentile?
Percentage is a number expressed as a fraction of 100 (like
75%). Percentile is a statistical measure indicating the value below which a
percentage of data falls.