Age Calculator
Calculate your exact age in years, months and days, find your age on any date, and see your next birthday, total time lived, zodiac sign and age milestones.
How to use Age Calculator
Use this Age Calculator to find your exact age from your date of birth. Enter your date of birth first, then choose the date you want to calculate your age as of. By default, you can use today's date to find your current age, or select a different date to see how old you were or will be on a specific day. The calculator displays your age in completed years, months and days. This calendar-based approach is more useful than simply dividing the total number of days by 365 because calendar years have different lengths and leap years contain an additional day. The result therefore reflects the actual dates involved in the calculation. You can optionally enter your birth time when you want more detailed time-based results. After calculating your age, the tool also provides additional information such as total seconds lived, total minutes, hours, days and weeks. These values help you understand your age in different units and are based on the dates entered into the calculator. The calculator also shows your next birthday and the number of days remaining until that birthday. This can be useful for birthday planning, countdowns and checking upcoming age milestones. The birthday information is based on your birth date and the current or selected calculation date. You can also use the tool to calculate your age on a future or historical date. This can be useful for checking how old you will be on a particular date, reviewing your age at an earlier point in time, or understanding eligibility periods that depend on age. For official applications or legal eligibility, always confirm the final requirement with the relevant organization. The calculator takes leap years into account, including February 29. This is important when calculating exact chronological age because the number of days in a year can vary. If a person was born on February 29, the interpretation of their birthday can depend on the rules or purpose of the calculation. The tool also provides informational classifications such as Western zodiac sign and generation based on the birth date or birth year. These features are for general reference and are separate from the chronological age calculation. Age milestones show notable points in a person's timeline, such as 1,000 days, 5,000 days, 1,000 weeks, 10,000 days, 15,000 days, 20,000 days, one billion seconds and one million hours. Completed milestones and upcoming milestones are displayed so you can see where you are in your personal timeline. For a simple age check, enter your birth date and leave the calculation date as today. For a future-age calculation, change the calculation date. For the most precise time-based result, enter your birth time as well. All calculations are performed in your browser using the information entered into the calculator.
Frequently Asked Questions
How accurate is the age calculator?
The calculator uses the actual calendar dates you enter and accounts for different month lengths and leap years. It calculates completed years, months and days rather than assuming every year has exactly 365 days. Entering a birth time can provide more detailed time-based results.
How is chronological age calculated?
Chronological age is calculated by comparing a person's date of birth with a selected calculation date. The calculator determines completed years first and then calculates the remaining months and days based on the calendar. This makes the result more precise than using a simple days-divided-by-365 calculation.
Can I calculate my age on a future date?
Yes. Change the Age As Of date to a future date and the calculator will show how old you will be on that date. This can be useful for future birthdays, school or application deadlines, retirement planning and other situations where you need to know your age at a specific point in time.
How many days old am I?
Enter your date of birth and calculate your age. The calculator can display your total time lived in days and other units such as weeks, hours, minutes and seconds. The exact result depends on the dates entered and, for more detailed calculations, your birth time.
Does the calculator account for leap years and February 29?
Yes. The calculator uses calendar dates and accounts for leap years, including February 29. This is important for accurate chronological-age calculations because not every year contains the same number of days.