300
Everyday
Percentage Calculator
Calculate percentages, ratios and percentage changes.
Free to use No account required Browser calculation
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Input
ReadyEnter your values
Enter the values for this calculator. We’ll show the answer, the method and the formula together.
Calculation method
Formula & methodology
The result above is backed by the calculator-specific formulas and assumptions shown here.
Percentage of a number
(Percentage ÷ 100) × NumberOne number as a percentage
(Part ÷ Whole) × 100Percentage change
((New − Old) ÷ |Old|) × 100The absolute starting value is used so the result describes the magnitude and direction of change consistently.
Method & assumptions
Values are calculated directly in the browser and are not sent to a server by the calculator interface.
Percentage results are shown with sensible decimal precision while retaining the underlying full-precision calculation.
A zero denominator is rejected because division by zero is undefined.
Examples
Worked examples
Examples use this calculator’s own inputs and outputs, not generic page filler.
25%
25% increase
25% decrease
Help & assumptions
Frequently asked questions
Important assumptions and practical details for this calculator.
How do I calculate a percentage of a number?+
Divide the percentage by 100, then multiply the result by the number.
What is the difference between percentage difference and percentage change?+
Percentage change compares a new value with a starting value. This calculator focuses on percentage change because it has a clear direction: increase or decrease.
Can percentages be greater than 100%?+
Yes. A percentage greater than 100% simply represents a quantity greater than the full reference amount.
Why can’t the second number or starting value be zero?+
Those modes divide by the reference or starting value. Division by zero is undefined, so the calculator asks for a non-zero denominator.
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