How common are March birthdays?
- 10,979births per day#9 of 12 months
- 8.3%of all births in the sample7,147,368 recorded
- March 21most common March date#149 of 366
- March 13quietest date that occurs every year#337 of 366
March is the 9th most common birth month of the 12, at 10,979 recorded births per day, 1.8% below an average day across 85,712,738 U.S. births from 1994–2014. Its most common date is March 21 (#149 of 366) and its quietest date that occurs every year is March 13 (#337).
Every date is coloured by the same six rarity tiers the reveal uses; the small number is its rank of 366 from most common.
- 1#176
- 2#308
- 3#188
- 4#226
- 5#228
- 6#252
- 7#185
- 8#229
- 9#316
- 10#248
- 11#251
- 12#218
- 13#337
- 14#180
- 15#213
- 16#315
- 17#171
- 18#242
- 19#257
- 20#209
- 21#149
- 22#235
- 23#323
- 24#259
- 25#232
- 26#275
- 27#270
- 28#201
- 29#285
- 30#329
- 31#314
Every March date: recorded U.S. births 1994–2014
One column per March date in calendar order, coloured by rarity tier, total recorded births 1994–2014.
Every March date, ranked
Ranked by total recorded births across the 21 years, the same measure as the site-wide rank of 366.
| Date | Total births | Rank of 366 | Odds | |
|---|---|---|---|---|
| March 21 | 235,883 | #149 | 1 in 363 | |
| March 17 | 234,700 | #171 | 1 in 365 | |
| March 1 | 234,495 | #176 | 1 in 366 | |
| March 14 | 234,368 | #180 | 1 in 366 | |
| March 7 | 233,850 | #185 | 1 in 367 | |
| March 3 | 233,405 | #188 | 1 in 367 | |
| March 28 | 232,864 | #201 | 1 in 368 | |
| March 20 | 232,226 | #209 | 1 in 369 | |
| March 15 | 232,129 | #213 | 1 in 369 | |
| March 12 | 232,001 | #218 | 1 in 369 | |
| March 4 | 231,560 | #226 | 1 in 370 | |
| March 5 | 231,388 | #228 | 1 in 370 | |
| March 8 | 231,350 | #229 | 1 in 370 | |
| March 25 | 231,202 | #232 | 1 in 371 | |
| March 22 | 231,059 | #235 | 1 in 371 | |
| March 18 | 230,793 | #242 | 1 in 371 | |
| March 10 | 230,444 | #248 | 1 in 372 | |
| March 11 | 230,308 | #251 | 1 in 372 | |
| March 6 | 230,287 | #252 | 1 in 372 | |
| March 19 | 230,048 | #257 | 1 in 373 | |
| March 24 | 229,992 | #259 | 1 in 373 | |
| March 27 | 229,682 | #270 | 1 in 373 | |
| March 26 | 229,546 | #275 | 1 in 373 | |
| March 29 | 229,032 | #285 | 1 in 374 | |
| March 2 | 227,660 | #308 | 1 in 376 | |
| March 31 | 226,937 | #314 | 1 in 378 | |
| March 16 | 226,912 | #315 | 1 in 378 | |
| March 9 | 226,813 | #316 | 1 in 378 | |
| March 23 | 226,193 | #323 | 1 in 379 | |
| March 30 | 225,599 | #329 | 1 in 380 | |
| March 13 | 224,642 | #337 | 1 in 382 |
March in the year
March has 8.34% of all recorded births in this sample, over 651 observed days. Months are ranked by births per day. On that measure March is #9 of 12, against September at the top (11,811 per day) and January at the bottom (10,721). Full month ranking.
Keep going
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Sources, method and limits
Main ranking: 85,712,738 recorded U.S. births on 7,670 calendar dates, 1994–2014. CDC/NCHS daily counts for 1994–1999 and Social Security Administration daily counts for 2000–2014, as compiled by FiveThirtyEight and attributed under CC BY 4.0. The overlapping years 2000–2003 are counted once.
Ranks compare totals across the 366 observed month-and-day dates. February 29 occurred 5 times in this window; every other date occurred 21 times, so per-occurrence figures are used wherever seasonality is compared.
Every figure above comes from the administrative records named here, at the granularity those records publish: a day, a month or a year. Coverage and definitions differ between countries and eras, so two sources are combined only where their documentation states the windows are separate, and the page where that happens says so.
Full method, leap-day treatment and definitions.
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