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Age calculator

Enter a birth date and choose the date on which to measure the age. The result includes a calendar breakdown and the next birthday.

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Calculate age on a chosen date

Compare a birth date with a reference date to obtain a calendar age in years, months and days. Change the reference date to check an age in the past or future rather than only today.

How to use it

  1. Replace the sample birth date with the date you want to calculate from.
  2. Choose the reference date; it initially uses today on your device.
  3. Read the calendar age, total days, whole weeks and whole calendar months, then the countdown to the next birthday.

Example

Starting point
Birth date 2000-01-01; reference date 2024-01-01.
What to expect
24 years, 0 months and 0 days; 8,766 total days. The next birthday countdown is 0 days because it is the birthday itself.

Before you start

  • A birth date after the reference date produces a warning instead of an age. The calculation uses dates, without a time of birth.
  • For the birthday countdown, a February 29 birthday is treated as February 28 in a non-leap year. This is the calculator's convention, not a rule for legal eligibility.