Percentage Calculator
Six calculation modes with instant results as you type. No buttons to click, no sign-up needed.
What is X% of Y?
Result
50
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Common Percentages
Percentage Formulas
X% of Y = (X / 100) × Y
What % = (Part / Whole) × 100
% Change = ((New - Old) / Old) × 100
Increase = X × (1 + Y/100)
Decrease = X × (1 - Y/100)
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Frequently Asked Questions
How do I calculate what X% of Y is?
Divide X by 100, then multiply by Y. Example: 25% of 200 = (25 / 100) x 200 = 50. Our calculator does this instantly as you type.
How do I calculate percentage change between two numbers?
Subtract the old value from the new value, divide by the old value, then multiply by 100. Example: Change from 80 to 100 = ((100-80)/80) x 100 = 25% increase.
How do I calculate a tip?
Multiply the bill by the tip percentage divided by 100. For an 18% tip on $65: 65 x 0.18 = $11.70. The total would be $76.70. Use our tip calculator tab for easy split calculations.