How do you compute years, months, and days?

We subtract years, then months, then remaining days using the calendar's month lengths. Leap years are respected.

How do leap-year birthdays work?

For people born on Feb 29, the next birthday in non-leap years defaults to Mar 1 (you can celebrate Feb 28 if you prefer).

Age Calculator

See your exact age in years, months, and days, plus total days, total weeks, and the countdown to your next birthday.

Enter dates

Date of birth

As of

—

Exact age (Y years, M months, D days)

—

Total days

—

Total weeks

—

Day of week you were born

—

Next birthday

—

Days until next birthday

Age Calculator — Find Exact Years, Months, and Days

Enter your date of birth and find your exact age in years, months, and days. This age calculator is accurate and useful for travel applications, health forms, or just curiosity. It updates instantly without needing manual math.

For example, someone born on January 1, 1990, would be [auto-calculated age] years old today. The results also show total months and days for complete detail.

Try our time converter for duration calculations, or return to Conversion Deck for other simple, accurate tools.

Age Calculator

Enter dates

Related Converters

Age Calculator — Find Exact Years, Months, and Days