Explore the chance that at least two people in a group share a birthday. The birthday paradox reaches a probability of about 50.7% with just 23 people.
Choose a group size, then run Monte Carlo trials to compare the measured match rate with the theoretical curve. Inspect a sample group to see which birthdays match.
The model assumes 365 equally likely birthdays and independent draws. It does not include leap days or seasonal differences in birth rates.
Built by Jack Homer. Read the Birthday Paradox Simulator project write-up.