Calendar-accurate age
Years, months, and days are calculated using real calendar boundaries, including month lengths and leap years.
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Calculator · Free
Age Calculator
Calculate an exact calendar age, understand the time already lived, and see the next birthday at a glance.
Dates stay in this browser
Your dates
Calculate an exact age
Your age, precisely.
Add a date of birth to see calendar age, total time lived, birth-day facts, and the next birthday countdown.
How it works
An exact age in three quick steps.
Age is calculated across real calendar years and months, rather than using a rough days-per-year estimate.
- 01
Enter a birth date
Choose the date of birth you want to calculate from.
- 02
Choose the reference date
Use today or calculate the exact age on any past or future date.
- 03
Review the full timeline
See calendar age, totals, birth facts, and the next birthday countdown.
More than a year count
A useful view of the whole timeline.
Useful lifetime totals
See completed months, weeks, total days, and hours alongside the date you were born on.
Birthday planning
Check the next birthday date, days remaining, and the age that will be reached.
Age calculator questions
Dates, leap years, and accuracy.
How is exact age calculated?+
The calculator counts complete calendar years first, then complete calendar months, and finally the remaining days. This is more accurate than dividing a total number of days by 365.
Does the calculator handle leap years?+
Yes. Real month lengths and leap years are used. For a February 29 birthday in a non-leap year, the anniversary is treated as February 28 for this calculation.
Can I calculate age on a date other than today?+
Yes. Change the calculation date to find the exact age on a historical date or a future date.
Is my birth date stored?+
No. The calculation happens in your browser and the dates are not uploaded or saved by Toolkit.
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