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This tool calculates exact age from a birth date: full years, months, and days lived, the total number of days lived, and how much time is left until the next birthday.

How to use it

• Enter a birth date and the age is calculated instantly as of right now.
• Change the "calculate age as of" date to anything else, including a future date, if needed.
• The total number of days lived is shown separately — handy for spotting a milestone like day 10,000.

Common uses

• Checking an exact age for a form that requires confirming adulthood or a minimum age.
• Counting down the days until a birthday to plan a gift or celebration.
• Calculating age as of a specific future date — for example, how old a child will be at graduation.

Things to keep in mind

For people born on February 29, a "full year" in a non-leap year is conventionally counted as reached on March 1 — a rule that varies between jurisdictions.

The calculation accounts for timezone — an age "as of this second" can differ by a day depending on the chosen timezone if the birth moment is close to midnight.