AGE · FREE
Age calculator: exact age in years, months and days
Enter a date of birth and an as-of date (today by default). You get your age in years, months and days, the total days and weeks, and when the next birthday falls.
AGE
36 years, 9 months, 13 days
13,435 days, or 1,919 weeks and 2 days
How the age calculation works
The calculator counts whole months between the two dates, turns 12 of them into a year, and reports the days left over. Because it works on calendar dates in UTC, time zones and daylight saving never shift the answer by a day.
Example birth dates
Open one of the pages below to see a fully worked age in days, weeks and years for a specific birth date, including a leap-day birthday.
Frequently asked questions
How is age in years, months and days calculated?
The calculator counts whole months from the birth date to the as-of date, then the days left over. Years are those months divided by 12.
How does a Feb 29 birthday work?
In years without a Feb 29, the birthday is counted on Feb 28. Your age in days is unaffected.
Is my date of birth stored?
No. The calculation runs in your browser and nothing is sent or saved.