A familiar date. A fresh perspective.
You know your birthday by heart. Its place in the rest of the calendar is a little less obvious. Birthday Odds is an independent project that turns aggregate birth counts into something you can explore in a few moments.
Your birthday doesn’t need to be rare to be a good one.
The appeal is the comparison: a date you recognize, a number you didn’t know, and perhaps a friend whose birthday turns out to be a little more unusual.
Made for a little curiosity
Choose a month and day. See its rank, explore the calendar, or compare it with someone else’s. The checker asks for no birth year, account, or email address.
The full birthday ranking and month comparisons give you a wider view. The methodology explains what the numbers actually measure.
The data behind the numbers
The checker and guides use historical U.S. birth counts from 1994–2014, compiled by FiveThirtyEight from CDC/NCHS and Social Security Administration records. They show how common each birthday was among the births recorded during that period.