How to Calculate Percentages in Your Head
Learn mental math tricks to quickly calculate percentages without a calculator. Essential for shopping, tipping, and everyday calculations.
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Percentage Calculator
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How to Calculate Percentages
Percentages are a way to express a number as a fraction of 100. The word "percent" means "per hundred."
Basic Percentage Formula:
Percentage = (Value / Total Value) × 100%
To find what X% of Y is: (X/100) × Y
To find what percentage X is of Y: (X/Y) × 100%
Example:
What is 15% of 200?
Solution: (15/100) × 200 = 0.15 × 200 = 30