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# Same Birthday Probability Calculator

The given here is the online Same birthday probability calculator which helps you in finding the probability of sum of persons in a group has same birthdays. This Birthday paradox calculator gives results in percentage.

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The given here is the online Same birthday probability calculator which helps you in finding the probability of sum of persons in a group has same birthdays. This Birthday paradox calculator gives results in percentage.

In a class of 23 students, there is a 50% chance of two students having the same birthday. Whereas in a class of 75 students there’s a 99.9% chance of two students having the same birthday.

Birthday Paradox Calculation Formula: You can refer the below given same birthday probability calculation formula to find the probability on your own. To use this formula, all you need is the data of number of persons in a group.

#### Formula:

p(n) = 1 - (365! / (365n x (365 - n)!)) Where, n = Number of Persons in a Group p(n) = Probability with Same Birthdays

Just input the number of persons in a group as input in this online Same birthday probability calculator to get the probability within the fractions of seconds.