How to use the age calculator
Pick your date of birth. The Age on date is set to today, but you can change it to any past or future date. Your exact age and the time until your next birthday appear instantly.
How exact age is worked out
- Count the full years between your birth date and the target date.
- Count the full months since your most recent birthday.
- Count the remaining days, taking the real length of each month into account (28–31 days).
Total days lived is the exact number of calendar days between the two dates, including leap days.
Common uses
- Checking age eligibility for school, jobs, retirement, visas or sports categories.
- Filling in forms that ask for age in years and months.
- Fun facts: finding out when you turn 10,000 days old (about 27 years and 4 months).
Frequently asked questions
How is age calculated?
Age is the number of full years since your date of birth. The calculator then counts the full months since your last birthday and the remaining days, so a result like 29 years, 4 months, 12 days is exact.
What if I was born on 29 February?
In years that are not leap years, this calculator treats 28 February as your birthday for the countdown. Your age in years still increases on 1 March in those years in most legal systems.
Can I calculate age on a past or future date?
Yes. Change the "Age on" date to any day — for example to check how old someone was at an event, or how old you will be on a future date.
Is my date of birth stored?
No. The calculation happens entirely in your browser and nothing is sent to a server.