How Rare Is My Birthday Quiz
How the Scales are Structured
Who Usually Takes This Test?
See How You Compare
Below is a preview of how scores are typically distributed across each scale.
Example Questions From the Test
- The 1st
- The 2nd to the 7th
- The 8th to the 12th
- The 13th
- The 14th to the 22nd
- The 23rd to the 28th
- The 29th to the 31st
- Never
- Sometimes
- Often
- Every year
- Winter
- Spring
- Early summer
- Late summer or early autumn
- Late autumn
How Rare Is My Birthday Quiz - Description and methodology of the test
Every birthday party has that moment when someone asks who else was born on this day. If you have ever typed how rare is my birthday into a search bar, the answer is closer than you think, because births are spread very unevenly across the year. The rarest birthdays bunch around winter holidays, while late summer is crowded with candles.
What the rarity score measures
The quiz opens with six questions about your actual date: the month, the day of the month, special dates such as Christmas Day or February 29, public holidays and long weekends, the season where you were born and how close you are to the mid-September peak. Each option carries rarity points that follow real birth counts, and together they make your birthday rarity score from 0 to 100. Three parts sit underneath it. Calendar spot shows how quiet your month and day are. Holiday effect shows how much holidays push planned births away from your date. Season effect shows how far you are from the peak that comes nine months after New Year. The most common birthdays, in mid-September, score close to zero, and New Year's Day scores close to the top.
How the quiz works and how to read it
There are 82 questions, and most people finish in about 10 minutes. After the six date questions come 76 short statements about how you live your birthday, each answered with one tap: No, Sometimes or Yes. Some of them describe the opposite habit, such as keeping your birthday quiet at work, and are scored in reverse, so quick answers stay accurate. These statements build four birthday sides that never change your rarity score:
- Shared birthdays: classmates, strangers and family born on your day;
- Birthday spotlight: how much you love being celebrated;
- Birthday keeper: how well you remember other people's dates;
- Birthday reflection: how much your birthday makes you take stock.
Read the rarity score first: up to 33 means a common birthday, 34 to 67 an uncommon one, and 68 or more a rare one. Then compare your four sides. Finding a birthday twin feels like a coincidence, yet in a room of thirty people the chance that two of them share a date is about seventy percent.
- Pelham, B. W., DeHart, T., Shimizu, M., Hardin, C. D., Han, H. A., & von Hippel, W. (2021). Identity selection and the social construction of birthdays. Frontiers in Psychology, 12, 693776.
- Darrow, L. A., Strickland, M. J., Klein, M., Waller, L. A., Flanders, W. D., Correa, A., Marcus, M., & Tolbert, P. E. (2009). Seasonality of birth and implications for temporal studies of preterm birth. Epidemiology, 20(5), 699-706.
- Jacobson, M., Kogelnik, M., & Royer, H. (2021). Holiday, just one day out of life: Birth timing and postnatal outcomes. Journal of Labor Economics, 39(S2), S651-S702.
- Martinez-Bakker, M., Bakker, K. M., King, A. A., & Rohani, P. (2014). Human birth seasonality: Latitudinal gradient and interplay with childhood disease dynamics. Proceedings of the Royal Society B, 281(1783), 20132438.
- Nunnikhoven, T. S. (1992). A birthday problem solution for nonuniform birth frequencies. The American Statistician, 46(4), 270-274.
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