Percentage Of Calculator
Calculate percentage of a number, percentage ratio, percentage change, and percentage difference.
What is% of?
Result
30
Proportion Visualisation
20.0%
Summary Sentence
20% of 150 is 30
Step-by-Step Calculation
Algebraic Formula
Formula: Y × (X / 100)
Substitution & Steps
150 × (20 / 100) = 150 × 0.2 = 30
How percentage calculations work
Four common percentage questions answered instantly: What is X% of Y? multiplies Y by X/100 — useful for discounts, tips, and tax calculations. X is what % of Y? divides X by Y and multiplies by 100 — useful to express a part as a fraction of a whole. % change from X to Y? computes (Y−X)/|X| × 100 — shows growth or decline as a percentage. % difference between X and Y compares two numbers using their average as the base.
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