Find out how common or rare your birth date really is
💡 Why This Matters Not all birthdays are created equal — decades of U.S. birth data show some dates happen way more often than others. Enter yours and see where it lands, from "everyone shares this one" to genuinely rare.
September 9th–20th are consistently the most common U.S. birth dates — about nine months after the December holidays — while December 25th, January 1st, and July 4th rank among the rarest, largely because far fewer scheduled births happen on major holidays.
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This tool ranks your birth date against well-documented U.S. birth-frequency patterns collected from decades of CDC natality data. Late-September dates cluster at the top of the frequency chart, while major holidays and February 29th sit at the bottom. Your date gets scored on where it falls in that real-world distribution, not a random guess.
A high rarity score means your birth date statistically sees fewer births nationwide than most other calendar days — often because it lands on a major holiday, or simply isn't in the September birth-rate cluster. A low score means you share your birthday with a lot of company. Neither is "better," it's just a fun statistical lens on your day.
This is a fun estimate based on aggregate national patterns, not your exact personal birth record. Regional variation, the specific year you were born, and leap years all shift real counts slightly. Treat the result as a conversation-starter stat, not a precise count of people who share your exact birthday.
Share your rarity score, compare it with friends and family, or use it as a fun icebreaker. It's also a neat way to think about hospital and scheduling patterns — a surprising number of "common" vs. "rare" days come down to when doctors schedule inductions, not just biology.
Example: Someone born September 16th lands in the most common cluster of U.S. birth dates, so their rarity score comes back low — lots of company. Someone born December 25th lands near the rarest end of the scale, since holiday birth counts drop sharply — a high rarity score.
Rarity comes from real U.S. birth-record patterns. Late-September dates are the most common (roughly nine months after winter holidays), while major holidays like Christmas, New Year's Day, and July 4th are rarer because fewer scheduled inductions and C-sections happen on those days. February 29 is rarest of all since it only occurs in leap years.
Yes — the rarity ranking is based on well-documented patterns from decades of U.S. CDC birth records, which consistently show September as the most common birth month and major holidays as the least common.
A large share of U.S. births are scheduled inductions or C-sections, and hospitals schedule far fewer of these on major holidays and weekends, which pulls the actual birth count down on those specific dates.