Age Calculator
Enter a date of birth and get the exact age in years, months and days — the way humans count age, not just a decimal number of years. You also get totals (days lived, hours lived) and a live countdown to the next birthday.
This is handy for official forms that ask age in years/months/days, for parents tracking little kids' ages, or for the timeless question of exactly how old you really are today.
How to use
- Enter the date of birth in the date picker.
- The 'as of' date defaults to today; change it to calculate age at any past or future date.
- Read the exact age breakdown, then check the next-birthday countdown below.
Frequently asked questions
How is age calculated exactly?
We count full years first, then full months since the last birthday, then leftover days — exactly how ages are stated on official documents.
Why do months in an age differ from calendar subtraction?
A 'month' varies from 28 to 31 days. Standard age counting advances the month only on the same day-of-month, which is what this calculator does — the same convention used legally in most countries.
Does the calculator handle leap-year birthdays (Feb 29)?
Yes. Feb 29 birthdays are treated as Feb 28 in non-leap years for the 'reached next age' date, which matches common legal conventions.
Can I calculate age at a date in the past or future?
Yes — change the 'as of' date. Age at any historical date (or a future one, which becomes a countdown) works the same way.