How do you handle leap day (February 29) birthdays?

We offer three policies for handling February 29 birthdays in non-leap years: ISO/European standard treats it as February 28, while US legal standard treats it as March 1. You can select your preferred policy in the calculator.

What is corrected age for premature infants?

Corrected age (also called adjusted age) accounts for prematurity by subtracting the number of weeks a baby was born before 40 weeks gestation from their chronological age. This gives a more accurate developmental age for premature babies.

How accurate is the age calculation?

Our calculations are precise to the second, accounting for leap years, varying month lengths, and time zones. We use the Temporal API for accurate date/time calculations.

Can I calculate age for a specific date?

Yes! Use the 'Calculate As Of' field to calculate age for any past or future date. This is useful for determining age on specific dates like anniversaries, legal documents, or insurance forms.

How many days old am I?

Enter your birth date in our calculator to find out exactly how many days you've lived. The calculator accounts for leap years and provides precise day counts.

What is the difference between chronological age and corrected age?

Chronological age is the time since birth, while corrected age adjusts for prematurity. For premature babies, corrected age = chronological age minus the number of weeks born early.

Chronological Age Calculator

Effective Date: January 1, 2025
Last Updated: January 1, 2025

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