How the countdown works
Your next birthday is this year's occurrence of your birth month and day if it's still ahead; otherwise it's next year's. The timer counts down to midnight (UTC) on that date. The day count is the number of full days between now and the target — the hour, minute, and second figures come from the same wall-clock arithmetic in your browser.
Leap-day birthdays
If you were born on February 29, the next calendar February 29 is the next leap year — 2028, then 2032, 2036. In common years between, leaplings often observe their birthday on February 28 or March 1 (the legal date varies by jurisdiction). The toggle in the result block lets you choose which date the countdown targets.
The wider leap-year math — the divisible-by-400 rule, the 1-in-1,461 odds, the live countdown to Feb 29, 2028 — is on the Leap Year Calculator.
What else your birthday tells you
For an exact age in years, months, and days from your date of birth — plus life expectancy at that age — use the Age Calculator. For how rare your specific date is across U.S. births, the Birthday Rarity Calculator ranks it against the other 365 dates of the year.
For the weekday-of-birth pattern (Tuesday is the most common U.S. birth day; weekends are quietest), see Day of the Week Born. The generation a birth year maps to — Pew through Gen Z, McCrindle's Gen Alpha and Beta — is on the Generation Calculator.