How to use Age and Birthday Calculator
Enter the date of birth and comparison date. The result shows completed years, months and days, total days lived and the next birthday countdown.
What the tool does
Calculate age in years, months and days from a birth date and see the time remaining until the next birthday.
Supported inputs
Date of birth and Calculate age on.
Actual output
The main result shows age, with the supporting values or breakdown displayed by the tool.
Privacy and processing
The calculation runs locally in the browser.
Limitations
Age is calculated from calendar dates. Time zones, incomplete birth records and legal age rules in a particular country may require separate checks.
Common mistakes
Confirm start and end values, timezone or business-day assumptions where relevant, and check whether endpoints or breaks are included.
Frequently asked questions
What can I use Age and Birthday Calculator for?
Calculate age in years, months and days from a birth date and see the time remaining until the next birthday.
What input does Age and Birthday Calculator accept?
Date of birth and Calculate age on.
What should I check after using Age and Birthday Calculator?
Age is calculated from calendar dates. Time zones, incomplete birth records and legal age rules in a particular country may require separate checks.
Related tasks and guides
- Date Difference Calculator — Calculate the calendar difference between two dates in years, months, weeks, days, hours and minutes.
- Add or Subtract Date Calculator — Add or subtract days, weeks, months or years from a chosen date and see the resulting calendar date instantly.
- Business Days Calculator — Count weekdays between two dates and optionally exclude weekends or supplied holiday dates from the total.
- Date Countdown Calculator — Calculate the days, hours, minutes and seconds remaining until a selected future date and time.