Age Calculator

Exact age is calculated by finding the difference between the birth date and the target date (today, or a date you specify), accounting for varying month lengths and leap years. First, years are counted. Then, remaining months are counted. Then, remaining days. This gives a more accurate result than dividing total days by 365 or 365.25. For example, someone born on January 31 is exactly 1 month old on February 28 (or February 29 in a leap year), not on March 2.

The calculator shows your total age in days under "Total Days." A 30-year-old is approximately 10,950 days old (30 × 365 = 10,950, plus leap years). A more precise number: 30 years from January 1, 1990 to January 1, 2020 = 10,957 days (8 leap years in that range, adding 8 extra days). The exact count depends on your birth date and how many leap years fall within your lifetime.

The calculator shows your birth day of the week. Some birthday folklore: a child born on Monday is said to be "fair of face," Tuesday is "full of grace," Wednesday is "full of woe," Thursday is "has far to go," Friday is "loving and giving," Saturday is "works hard for a living," and Sunday is "bonny and blithe." Statistically, Tuesday is the most common birth day of the week in the United States, followed by Friday and Thursday. Saturday and Sunday are the least common because fewer elective deliveries are scheduled on weekends.

Western astrology divides the year into 12 signs based on the sun's position at birth: Aries (Mar 21 – Apr 19), Taurus (Apr 20 – May 20), Gemini (May 21 – Jun 20), Cancer (Jun 21 – Jul 22), Leo (Jul 23 – Aug 22), Virgo (Aug 23 – Sep 22), Libra (Sep 23 – Oct 22), Scorpio (Oct 23 – Nov 21), Sagittarius (Nov 22 – Dec 21), Capricorn (Dec 22 – Jan 19), Aquarius (Jan 20 – Feb 18), Pisces (Feb 19 – Mar 20). The cusp dates vary slightly by year because the sun doesn't move to an exact degree at midnight; if you were born on a cusp date, the exact sign depends on your birth time and year.

The Chinese zodiac repeats on a 12-year cycle, with each year associated with an animal: Rat, Ox, Tiger, Rabbit, Dragon, Snake, Horse, Goat, Monkey, Rooster, Dog, Pig. Unlike the Western zodiac, the Chinese zodiac is based on the year of birth, not the month. Note that the Chinese New Year falls between late January and late February, so people born in January or early February may belong to the previous year's animal. This calculator uses the standard Gregorian year for simplicity; for precise results near Chinese New Year, check the exact start date for that year.

Generational definitions vary by researcher, but the most widely used ranges are: Silent Generation (born 1928–1945), Baby Boomers (born 1946–1964), Generation X (born 1965–1980), Millennials / Generation Y (born 1981–1996), Generation Z (born 1997–2012), Generation Alpha (born 2013–present). These are approximate and defined by social researchers, not official census categories. People born near the boundaries of two generations are sometimes called "cuspers" and may identify with characteristics of both.

Enter the birth date in the "Date of Birth" field and the historical target date in the "Age at Date" field. The calculator computes the exact age at that moment. This is useful for: calculating a historical figure's age at a specific event (how old was Napoleon at Waterloo?), determining age for legal milestones (voting age, pension eligibility) at a past date, or working out how old you were when a major historical event occurred. The calculator handles dates going back centuries.

Most Western countries count age from birth (turning 1 on the first birthday). Traditional East Asian age counting (used historically in Korea, China, and Japan) counts differently: a child is 1 at birth and turns 2 on the next Lunar New Year, regardless of birth month. This means two people born in different months of the same year share the same traditional age. Korea officially moved to the Western system for most legal purposes in 2023. In some legal contexts, age is counted in completed years (you are "age 30" from your 30th birthday until your 31st), which is the system this calculator uses.

People born on February 29 (leap day babies, or "leaplings") only get a true calendar birthday every 4 years. For legal and practical purposes, most countries treat February 28 or March 1 as the official birthday in non-leap years — this varies by jurisdiction. For this calculator, age is calculated to the nearest day, so in non-leap years a leapling's "birthday" is counted on February 28. The next birthday countdown shows the next February 29, which may be up to 4 years away. There are approximately 5 million leap day babies alive worldwide, born with odds of about 1 in 1,461.

The calculator shows your total age in minutes. As a reference: at 1 year old you are approximately 525,960 minutes old. At 30, approximately 15,778,800 minutes. At 52 (Lau's age), approximately 27,348,480 minutes. These are based on calendar days only — the exact minute count depends on your birth time, which this calculator doesn't require. If you know your birth time, add the hours and minutes from midnight of your birth date for a truly precise count. Our Fun section has a "Seconds Alive" calculator for an even more dramatic number.