Date of Birth
Age at Date
Defaults to today.
Fill in a date of birth to see the age.
Years, months, days, and the countdown to the next birthday.
Related Tools
Defaults to today.
Fill in a date of birth to see the age.
Years, months, days, and the countdown to the next birthday.
Related Tools
The Age Calculator works out an exact age in years, months and days between a birth date and any other date, along with the totals in days, weeks, months, hours and minutes, the day of the week you were born, and how long until the next birthday. Handy for forms and eligibility checks, and for settling the question of whether you were a Tuesday baby.
The guide behind this tool
Date Arithmetic Is Harder Than It Looks: Leap Years and Feb 29
One month after 31 January has no single right answer. How months create ambiguity, and when a leap-day baby legally turns 18.
Enter a date of birth.
Optionally change the "Age at Date" field; it defaults to today.
Read the breakdown, the totals, and the countdown to the next birthday.
Your birthday only lands on the calendar every fourth year, so in a common year the countdown treats 1 March as the date, which is the usual convention and the one most legal systems follow. The tool says when it has done this, and in a leap year it goes back to 29 February.
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