Birthday Rarity Ranking
Birthday Rarity of February 29
A very rare birthday- By number of births
- 351/ 366
- By rarity
- 16/ 366
- Average births per year
- 1,962
- Japanese people sharing it (est.)
- 82,000
That is 16.1% fewer than the all-day average (about 2,340 births/year).
February 29 only exists in leap years (once every four years as a rule), so its yearly average covers the three leap years in the period (2016, 2020 and 2024). The estimated number of people sharing this birthday is accordingly much smaller.
Compared with neighboring days
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).
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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.