Age calculator
Calculate exact age from a date of birth and see total days, hours, next birthday and milestones.
About this calculator
The age calculator converts a date of birth into a clear age in years, months and days.
It also shows total days lived and upcoming round birthdays, which is handy for planning celebrations or eligibility dates.
How it works
- 1
Enter the date of birth.
- 2
Leave the target date empty to calculate age today, or choose a specific date.
- 3
The result is calculated from date values only, not from time of day.
Practical examples
- Check exact age for a form or registration.
- Plan a 30th, 40th or 50th birthday.
- Find how many days remain until the next birthday.
Frequently asked questions
Does the calculator use the current time?
No. It compares calendar dates only, so the result is stable throughout the day.
Can I calculate age on a past or future date?
Yes. Use the optional target date to calculate age on any date after the birth date.
How are leap-year birthdays handled?
The calculator keeps the calendar date where possible and uses normal calendar rollover rules for invalid dates.
Is total hours exact?
It multiplies full calendar days by 24 and ignores time of day, daylight saving time and time zones.
Are dates stored?
No. The calculation runs locally in the browser.