How to use Age Calculator — Find Your Exact Age in Years, Months & Days
- 1Enter a date of birth.
- 2Optionally change the 'as of' date.
- 3See the exact age plus total days, weeks and hours lived.
About Age Calculator
Age is simple in whole years but fiddly to work out exactly in years, months and days by hand — this calculator handles the month-length and leap-year edge cases for you and shows the answer instantly.
Beyond the headline number, it also shows total days, weeks and hours lived, which day of the week you were born on, and exactly how many days remain until your next birthday.
Everything is computed locally in your browser — your date of birth is never sent anywhere.
Frequently asked questions
Can I calculate age as of a date other than today?
Yes — change the 'age as of' field to any date, useful for figuring out someone's age on a specific past or future date.
How is the exact age calculated?
By counting full years, then full months, then remaining days between the two dates, handling different month lengths and leap years correctly.
Does it tell me the day of the week I was born on?
Yes, it's shown alongside the main result.
Is my date of birth stored anywhere?
No — the calculation happens entirely in your browser and nothing is saved or sent anywhere.
Is it free?
Yes, unlimited and free, with no sign-up.