Birthday Paradox Calculator

Calculators and formulas for calculations the Birthday Paradox

Birthday Paradox Calculation


This function calculates the Birthday Paradox for a set of n people.

The birthday paradox descript the probability that, in a set of n people, at least two will share a birthday. The birthday paradox refers to the counterintuitive fact that only 23 people are needed for that probability to exceed 50%.

For the calculation, enter the number of people. Then click on the 'Calculate' button.

Calculate the Birthday Paradox

 Input
number of people
Decimal places
 Result
Probability

Formula of Birthday Paradox

Birthday formula

Example for 3 people

Birthday example

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