Forms, insurance quotes and school applications often need your exact age on a particular date. Enter a date of birth and this calculator shows the age in full years, the exact years, months and days, and how many days you have lived.
Change the “Age on” date to find out how old someone was — or will be — on any day. Leap-day birthdays are handled correctly.
How to use
- Enter the date of birth.
- Leave “Age on” as today, or pick another date.
- Read the age, the exact breakdown and the days until the next birthday.
Why use Deftivo
Exact, not approximate
Months and days are counted on the calendar, so month lengths and leap years are taken into account.
Any date
Check an age on a deadline, an exam day or a future birthday.
Instant and private
Results update as you type. Nothing you enter is sent anywhere.
Frequently asked questions
How is age calculated?
Your age goes up by one on each birthday. Until the birthday in a given year, the age is the difference in years minus one.
What if I was born on 29 February?
In non-leap years the birthday is counted on 28 February, which is the most common convention.
Can I use it for a future date?
Yes. Set “Age on” to any date to see how old someone will be then.