Age Calculator
Calculate age in years, months and days from date of birth.
An age calculator gives you your exact age within seconds. You enter your date of birth and the tool returns the years, months and days you have lived. It removes the mental math and the risk of miscounting. The same method works for any birth date and any target date you choose.
How the Calculator Works
The tool subtracts your birth date from today's date. It reads both dates and counts the full gap between them. The result shows years first, then the leftover months and days. You get a clean answer without opening a calendar.
You can also change the end date to any day you want. Pick a past date to see how old you were back then. Pick a future date to see your age on a birthday or event. The date of birth calculator handles both directions with the same accuracy.
What You Need to Enter
- Your date of birth in day, month and year
- The end date, which stays set to today unless you change it
- Nothing more, since the result appears on its own
Both fields are standard date pickers, so you can type a date or pick it from the calendar. The end date starts on today, so most people only fill in their birth date. The result updates the moment you change either date.
How Age Gets Calculated
After the years are set, the tool counts the remaining months and days. Leap years are handled so a 29 February birth date stays correct. A date of birth calculator that skips this step would drift by a full day. The figure here holds accurate right down to the day.
The same tool can also measure the gap between any two dates. Set a start date and an end date to find a full duration. This suits anniversaries, project spans and age at death.
People often ask how old they are on a specific past day. The same steps answer that too. Our age calculator handles months of different lengths and leap years on its own.
Common Uses in Daily Life
Some people simply want to know their total days lived. Others watch the countdown to their next birthday and plan around it. Employers and clinics sometimes need an age stated in exact months. A quick check settles that in one step and ends friendly arguments about who is older.
Age in Different Units
- Years, months and days for standard records
- Total days lived, a fun number to watch grow
- Approximate total months, handy for babies and infants
Frequently asked questions
How does an age calculator work?
It subtracts your date of birth from the end date and shows the gap in years, months and days.
Can I find my age on a future date?
Yes, set any future end date and the tool shows your age on that day.
Does it stay accurate for leap year birth dates?
Yes, it corrects for 29 February so your age stays right to the day.
How old am I in total days?
Enter your birth date and the tool returns your total days along with years and months.
Can I use it on my phone?
Yes, it runs in any browser and works on phones, tablets and computers.
Related calculators
Other tools people use alongside the age calculator.