An age calculator works out exactly how old you are from your date of birth, down to the year, month and day, instead of the rough "years since birthday" math most people do in their head. It's the fastest way to answer "how old am I" precisely, and it also handles a question plain mental math struggles with: how old you were, or will be, on any other date, not just today.
Enter your date of birth and click Calculate Age. The tool instantly returns your age in full years, remaining months, remaining days, and total days lived. You can also change the "Age at Date" field to work out age on any past or future date, for example how old you were on a specific day, or how old you'll turn on a date coming up.
Age is calculated by counting the full years between two dates, then the remaining full months, then the remaining days, which is how age is officially defined in most countries. This calculator does the same thing automatically: it takes your date of birth and the "Age at Date" you choose, works out the years, months and days between them, and also shows the total number of days for a single precise figure. It uses the actual number of days in each calendar month, so the result stays accurate whether the months involved have 28, 30 or 31 days, and it handles February 29 birthdays correctly in non-leap years.
An exact age in years, months and days comes up more often than people expect:
If you only need the gap between two dates rather than an age, the date difference calculator covers that directly.
The calculator counts the full years, then remaining months, then remaining days between your birth date and the selected date — matching how most countries officially define age.
Leap day birthdays are handled correctly — in non-leap years, your birthday is treated as March 1 for age calculation purposes.
Yes — use the "Age at Date" field to set any date, past or future, and the calculator shows your age as of that day, which is useful for planning ahead or checking age on a specific historical date.
The result includes a Total Days figure alongside the years, months and days breakdown, showing the exact number of days between your date of birth and the date you selected.
Yes — because months vary from 28 to 31 days, the calculator checks the actual number of days in the previous month when working out the remaining days, so the breakdown stays accurate year-round.
Yes — enter any date of birth, yours or someone else's, and the calculator works the same way. It's commonly used to check a child's age, an eligibility cutoff, or someone else's exact age for a form.