Util Tools Free Age Calculator Online
Find your exact age in years, months, and days — plus total weeks, hours, and a live seconds counter. See the day you were born, days to your next birthday, milestones, and your zodiac signs.
Enter your date of birth to begin.
Frequently Asked Questions
- How is age calculated exactly?
- Age is calculated by finding the difference between the date of birth and the current date (or selected as-of date). The calculator counts complete years, then remaining complete months, then remaining days for a precise result.
- How many days old am I?
- To find your exact age in days, the calculator counts every calendar day from your date of birth to today, including leap years. Enter your birthdate above to see your precise day count.
- What day of the week was I born?
- This calculator uses the Zeller's congruence algorithm to determine the exact day of the week for any historical date. Enter your date of birth to find out instantly.
- What is a leap year and how does it affect age calculation?
- A leap year has 366 days (February has 29 days) instead of the usual 365. Leap years occur every 4 years, except for century years not divisible by 400. This calculator accounts for all leap years in its day count.
- How do I calculate the age difference between two people?
- Use the Compare Ages mode — enter both dates of birth and the calculator shows the exact difference in years, months, and days.
- When will I be 1 billion seconds old?
- 1 billion seconds is approximately 31.69 years. Enter your birthdate to find the exact date and time you will (or did) hit this milestone.