Birthday Paradox Calculator
MathCalculates the probability that at least two people in a group share the same birthday.
How to use this calculator
Start with your values, or try a preset.
Enter Number of People in the units shown.
Read Probability of no shared birthdays and Probability of at least one shared birthday in the results panel. Results update as you change the inputs.
Choose a preset to load an example, then adjust the values for your situation.
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