How Leap Years Affect Your Age Calculation

Leap years exist because the Earth takes approximately 365.2422 days to orbit the Sun. The Gregorian calendar adds February 29th every 4 years to account for this extra quarter-day.

When calculating age precisely, leap years create complexity. A simple division of total milliseconds by 365.25 days introduces cumulative errors over time.

People born on February 29th (leaplings/leapers) celebrate their birthday on February 28th or March 1st in non-leap years. Age calculators must account for this edge case.

Our age calculator at Age Right Now handles leap years by subtracting dates component-by-component — accounting for varying month lengths and the exact 366-day length of leap years.

This ensures your ticking decimal age is astronomically accurate, even if you were born on February 29th or during a leap year.