Birthday Rarity Ranking
Birthday Rarity of September 6
A common birthday- By number of births
- 91/ 366
- By rarity
- 276/ 366
- Average births per year
- 2,439
- Japanese people sharing it (est.)
- 339,700
That is 4.3% more than the all-day average (about 2,340 births/year).
Compared with neighboring days
| Date | Avg. births / year | Rank |
|---|---|---|
| September 1 | 2,418 | 115 |
| September 2 | 2,365 | 174 |
| September 3 | 2,311 | 236 |
| September 4 | 2,334 | 209 |
| September 5 | 2,427 | 106 |
| September 6 (this day) | 2,439 | 91 |
| September 7 | 2,510 | 43 |
| September 8 | 2,408 | 130 |
| September 9 | 2,453 | 79 |
| September 10 | 2,383 | 154 |
| September 11 | 2,409 | 128 |
Across the year
The most and least common days
In the 2015-2024 data, January 5 has the highest yearly average (about 2,820 births/year) and January 1 the lowest (about 1,475).
Check another birthday
About the data
- Source: Ministry of Health, Labour and Welfare, Vital Statistics of Japan (final figures), archived statistical table 7 of the birth volume, “Live births by place, month, day and hour of birth”, downloaded from e-Stat (Vital Statistics) on 2026-08-02. The counts cover births of Japanese nationals in Japan.
- We aggregated the 10 years 2015-2024 (8,549,425 births in total). The ranking uses the average number of births per year for each of the 366 calendar days; days with an identical average share the same rank.
- February 29 exists only in leap years (2016, 2020 and 2024 within the period), so its average is per leap year.
- “Japanese people sharing this birthday” is an estimate: the Japanese population of 119,078,000 (Statistics Bureau of Japan, Population Estimates, final figures as of February 1, 2026) multiplied by each day's share of births in 2015-2024, rounded to the nearest hundred. It assumes the month-day distribution of births is similar across all generations, which is an approximation.
- Only national holidays fixed to a calendar date are noted. Moving holidays (Coming of Age Day, Marine Day, Respect for the Aged Day, Sports Day, and the equinox holidays) are not tied to a single date.
- A clear pattern in the data: fewer births are recorded around the New Year holidays (January 1-3 and December 31) and on national holidays, and more on weekdays around long holidays.