Age Calculator -- Years, Months & Days

Subtract your birth year from the current year, then adjust based on whether your birthday has occurred yet this year. For the month and day portion, compare your birth month/day to today's month/day. This calculator does this automatically -- enter your birthdate and see your exact age in years, months, and days instantly.

Your age in days is the total number of days between your birthdate and today, including any leap days. For a quick estimate: years x 365.25. For an exact count, use this calculator -- it counts every day individually.

Leap years (every 4 years, with exceptions) add one day -- February 29. Your age in years is not affected, but your total days alive includes every leap day that occurred during your lifetime. If born on Feb 29, you technically have a birthday only every 4 years; non-leap years treat Feb 28 or March 1 as the equivalent.

In non-leap years, there is no February 29. Legal conventions vary: some jurisdictions consider March 1 as your birthday, others use February 28. For age calculation, this tool counts complete years normally -- your age increases by 1 each year, not just in leap years.

Chronological age is the exact time elapsed since birth. Biological age reflects how well your body is functioning relative to its chronological age. A 50-year-old with excellent health markers might have a biological age of 40. This calculator measures chronological age only.

Traditionally in East Asia, a baby is 1 year old at birth and gains a year every New Year's Day. A child born on December 31 would be "2 years old" the next day (January 1). South Korea switched to the international (Western) system in June 2023 for legal and official purposes.

The method is the same: subtract the earlier date from the later date. Count complete years, then remaining months, then remaining days. This gives the exact elapsed time between any two dates, not just birth to today.

At the global average life expectancy of about 73 years: 73 x 52.18 = roughly 3,809 weeks. In countries with higher life expectancy (80+ years): approximately 4,174 weeks. Your current week count is shown in the statistics section above.

Total months = (complete years x 12) + remaining months. If you are 30 years and 5 months old, your total is (30 x 12) + 5 = 365 months. The count only equals years x 12 on your exact birthday when remaining months = 0.

No. All calculations run in your browser using JavaScript. Your birthdate is never transmitted to any server, stored in any database, or logged in any way. You can verify this by using the tool offline after the page loads.

Subtract your birth year from the current year to get a rough age in years, then adjust for whether your birthday has occurred yet this year. For exact age in months and days, compare the month and day of your birthdate to today's date, borrowing from the previous month if today's day is smaller than your birth day.

To find your age in days, count every day from your birthdate to today. This includes leap days that fell within that range. For example, someone born on January 1, 2000 would be 9,531 days old on February 4, 2026. Use an age calculator for an exact count.

Leap years add one extra day (February 29) every four years (with exceptions for century years not divisible by 400). This affects total-day counts but not your age in years. If you were born on February 29, most conventions treat March 1 as your birthday in non-leap years.

Chronological age is the time elapsed since birth, measured in years, months, and days. Biological age reflects physiological condition and how well the body functions relative to the expected norm. This calculator computes chronological age. Biological age requires medical assessments.

In the Western system, age starts at 0 at birth and increases by 1 on each birthday. In the East Asian age system (used traditionally in Korea, China, and other countries), a baby is considered 1 at birth and gains a year every New Year's Day, not on their birthday. South Korea officially switched to the Western system in 2023.

Use the same method as calculating age from a birthdate: subtract the earlier date from the later date. Count complete years first, then remaining months, then remaining days. This gives you the exact duration between any two dates.

Your age in total months equals (complete years x 12) + remaining months. For example, if you are 25 years and 7 months old, your total months are (25 x 12) + 7 = 307. The years-times-12 shortcut only works if the remaining months are zero (i.e., it is exactly your birthday).

A standard year has 52 weeks and 1 day (365 / 7 = 52.143). A leap year has 52 weeks and 2 days. So total weeks lived is approximately your age in years x 52, though the exact count depends on leap years within your lifetime.

No. All calculations happen in your browser using JavaScript. Your birthdate is never sent to any server, stored, or logged.