Age Calculator

Frequently asked questions

How is age calculated exactly?

Age is calculated by comparing the birth date to the target date (default: today). We compute the difference in years, then adjust for months and days. If the day of the month in the target date is earlier than in the birth date, we borrow from the month; if the month is earlier, we borrow from the year. Total days, weeks, hours and minutes are derived from the exact time difference between the two dates. All calculations run in your browser using standard JavaScript Date handling.

How do I calculate age between two specific dates?

Use the 'Calculate as of' date field. Set it to the end date you care about (for example, a past date for historical age, or a future date for projection). The calculator then shows how old the person was or will be on that exact date. This is useful for eligibility checks, historical research, or planning.

What is the difference between age in years vs total days?

Age in years, months and days is the usual 'calendar' age: how many full years have passed, plus the remaining months and days since the last birthday. Total days is the exact number of days between the two dates. For example, a one-year-old has lived 365 or 366 days (depending on leap year). Total days is useful for precise duration; calendar age is what we use in everyday language.

Which generation am I if I was born in 1990?

Birth years 1981–1996 are commonly classified as Millennials (Generation Y). So if you were born in 1990, you are a Millennial. The calculator uses these ranges: before 1946 Silent Generation, 1946–1964 Baby Boomer, 1965–1980 Gen X, 1981–1996 Millennial, 1997–2012 Gen Z, 2013 and later Gen Alpha. These boundaries vary slightly between sources.

How is the zodiac sign determined?

Zodiac signs are based on the tropical zodiac: the sun's position relative to fixed date ranges. Each sign has a start and end date (e.g. Aries March 21 – April 19). The calculator uses your birth month and day (ignoring year) to determine which range you fall into. This gives the Western (sun sign) astrology sign. It does not use birth time or location, so it is not a full birth chart.

What is the Chinese zodiac and how is it calculated?

The Chinese zodiac has 12 animals in a cycle (Rat, Ox, Tiger, Rabbit, Dragon, Snake, Horse, Goat, Monkey, Rooster, Dog, Pig). Your sign is determined by your birth year. The cycle repeats every 12 years. The calculator uses the formula (year − 1900) mod 12 to map to the correct animal. 1900 is a Rat year in the standard cycle. The result is for entertainment and cultural reference.

How many days have I been alive?

The 'Total Days' card shows the exact number of days between your date of birth and the 'Calculate as of' date. This includes leap years. For example, if you were born 30 years ago, you have lived about 10,950 days (or 10,957 if including leap years). The same logic is used to compute total weeks, hours and minutes lived.

Is this age calculator accurate for leap year birthdays?

Yes. The calculation uses the actual calendar: it counts real days between dates, so leap years are handled correctly. If you were born on February 29, the calculator still works; on non–leap years your 'birthday' is often considered February 28 or March 1 depending on context. The next-birthday countdown uses the same month and day in the next occurrence.