How to use the Age Calculator
- 1
Enter the date of birth.
- 2
Leave “Age on” as today, or pick another date to calculate age at a specific moment.
- 3
Read the exact age in years, months and days along with the totals and next-birthday countdown.
Features & benefits
Exact breakdown
Years, months and days calculated with correct month lengths and leap years.
Any reference date
Calculate age on a past or future date, for eligibility checks or historical records.
Lifetime totals
Total months, weeks, days and approximate hours lived.
Birthday countdown
Days remaining until the next birthday and the weekday it falls on.
How exact age is calculated
Age is counted in completed years, then completed months, then remaining days. If someone was born on 20 March and today is 10 May, they have completed one month (20 March → 20 April) plus 20 days.
Leap-day birthdays (29 February) are handled the common legal way: in non-leap years the birthday is treated as 28 February for the countdown. Calculations use calendar dates only, so time zones never shift the result.
Frequently asked questions
How are leap years handled?
The calculator uses the real calendar, including leap years, so totals such as days lived are exact.
Can I calculate the time between two dates?
Yes. Enter the earlier date as the date of birth and the later one in “Age on”.
Is my date of birth stored?
No. Everything is calculated in your browser and nothing is saved.