Percentage Calculator
Calculate percentages, percentage changes, and solve percentage problems.
What is X% of Y?
Example: I have $100, I want to know what 20% of it is
$X is Y% of what number?
Example: I have $240 and I know it's 25% of something, what's the original number?
Percentage Change
Example: I had $100, now I have $120, what's the % change?
Abbreviations Explained
% (Percent): Per hundred; a way to express a number as a fraction of 100.
Percentage Increase: The amount by which a value has grown, expressed as a percentage of the original value.
Percentage Decrease: The amount by which a value has declined, expressed as a percentage of the original value.
Percentage Change: The relative change between an old value and a new value.
Percentage Of: Finding what portion one number represents of another number.
How the Calculation Works
Common percentage formulas:
1. What is X% of Y?
Example: 20% of 150 = (20/100) × 150 = 30
2. X is what % of Y?
Example: 30 is what % of 150? = (30/150) × 100 = 20%
3. Percentage Change
Example: From 100 to 120 = [(120-100)/100] × 100 = 20% increase
Find Percentage Tools & Resources
Explore these helpful financial and educational resources: