Age calculator
Calculate calendar age on a date you choose.
Age calculator
Your result appears here
Adjust the values to see your result automatically.
How to use Age calculator
The Age calculator takes a date of birth and an age-on date and returns the exact calendar age in years, months and days, along with total days and total weeks. It counts from the birthday through the calendar rather than dividing days by 365, keeps leap days in the count, and rejects a birth date later than the reference date.
- Adjust the values; an initial result is calculated from the defaults.
- Change the basic settings or open Advanced mode to fine-tune the result.
- Review and copy or download your result. Pause Live results to run manually. Sources or individual settings above 20,000 characters require an explicit run.
What this tool supports
Calculate calendar age on a date you choose.
- Date of birth
- Set this value for your task.
- Age on date
- Set this value for your task.
Limits and processing
Use finite numbers, valid dates and the ranges shown by each control. Invalid values produce an error without a downloadable result.
Frequently asked questions
How old will I be on a specific future date?
Enter your date of birth and set Age on date to the future date. The calculator returns your age in years, months and days on that day, plus the total number of days and weeks lived by then.
Does the age calculator divide days by 365?
No. Age is counted in calendar years, months and days from the birthday, so leap years do not skew the result. Total days are reported separately as an exact day count between the two dates.
Does the time of day or my time zone affect the age?
No. The calculator works with calendar dates only, in YYYY-MM-DD form. Birth times and time zones are not used, so the result is the same wherever you are on the age-on date.
Where is my input processed?
This operation processes its source in your browser. Copy and download are explicit actions; source input is not saved in an account or history.
What are the input limits?
Use finite numbers, valid dates and the ranges shown by each control. Invalid values produce an error without a downloadable result.