Calculate your age online
Enter your date of birth and the date to calculate against to find the age in years, months, and days.
Age Calculator
Select both dates to calculate your age.
How is age calculated?
Completed years, months, and days
The calculator compares the selected dates and counts completed years, months, and remaining days. The date of birth must not be later than the calculation date. Check date entry carefully, especially around month ends and leap-day birthdays.
How to use an age calculator
Select your date of birth, choose the date you want to calculate against, and run the calculation. The result is expressed as completed years, months, and remaining days. You can use a past or future comparison date to calculate age on a particular event date.
Date formats and leap years
Make sure the date picker shows the correct day, month, and year. Month lengths vary, and people born on February 29 may see different birthday conventions used in different contexts. This calculator provides a calendar-based age breakdown; official forms may apply their own rules.
When an age calculation is useful
An age breakdown can help with birthday planning, personal records, school or activity forms, and calculating the time between two dates. For legal, medical, insurance, or eligibility decisions, confirm the applicable rules with the relevant authority rather than relying only on an online estimate.
Explore more free tools
Word Counter · Percentage Calculator · Age Calculator · Text Case Converter · Image Compressor