Leap Year Age Calculator
Specialized calculator for February 29 leap day babies to compare calendar age against true quadrennial leap birthdays.
Leap Year & Feb 29 Birthday Calculator
Discover your quadrennial 'leap age' (actual February 29ths lived) and see all upcoming Leap Day birthdays.
Official Leap Birthdays
The Science of Leap Years and Feb 29
The Earth takes approximately 365.2422 days to complete an orbit around the Sun. To keep our calendar synchronized with the astronomical seasons, an extra intercalary leap day (February 29) is added to the calendar in years divisible by 4 (with the exception of century years not divisible by 400).
Without leap years, our calendar would drift by approximately 24 days every century.
The mathematical probability of being born on February 29 is roughly 1 in 1,461.
Every 4 solar years corresponds to exactly one genuine February 29 celebration.
Help friends and family calculate their exact age & milestone countdowns
Frequently Asked Questions
Find clear answers to common questions about age calculation, leap years, and date math.
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Want to understand how calendar borrowing, leap days, and year subtractions are calculated mathematically?