Webhow popular do you think your own birthday is? Find out with our interactive graphic average daily births, england and wales, 1995 to 2014 Weblet your birthday star be your daily guide. Webyou can use online birthday rarity calculators, take a unique birth date test, or participate in a how rare is my birthday quiz to determine the rarity of your. Webover at tableau, research analyst lisa trescott created a visualization — based on us government data — that shows just how common different birthdays are. Webhave you ever heard the birthday paradox? How common is your birthday? Find out exactly with an interactive heat map. Web367 rowsthe more babies born on average, the more common the birthday. The calendar featured at the top of the article is a simple heat map of the data. Webthis is accounted for in the chart above (without the correction, a feb 29 birthday has a relative frequency of 0. 92/4 = 0. 23 compared to the probability of being.