나이 계산기
나이를 년, 월, 주, 일 단위로 정확하게 계산하세요. 별자리, 생일의 요일, 다음 생일까지의 카운트다운을 확인할 수 있습니다.
생년월일과 기준일을 입력하여 정확한 나이를 계산합니다.
How to Use
- 1
Enter your birth date
- 2
The target date defaults to today — change it to calculate age at any past or future date
- 3
View your exact age in years, months, and days
- 4
See fun facts: day of week born, zodiac sign, next birthday countdown
- 5
Understanding the key inputs — your birth date should be entered accurately; the target date lets you calculate age at any specific point in time
- 6
Interpreting the results — your age is shown in years, months, and days with exact precision, automatically accounting for leap years
- 7
Use the additional stats like days alive, zodiac sign, and next birthday countdown for planning and fun facts
예시
좋은 예시
Current age
Born: 1995-03-12, Age today: 31 years, 3 months, 8 daysFuture date calculation
Born: 1990-01-01, Age on 2050-01-01: 60 years, 0 months, 0 daysHow many days old
Born: 2000-01-01, As of 2025-01-01: 9,132 days oldAge difference between two people
Person A born 1990-05-15, Person B born 1993-11-20: difference is 3 years, 6 months, 5 daysAge for school enrollment cutoff
Child born Aug 15, 2020: Age on Sep 1, 2025 = exactly 5 years and 17 days — meets the cutoff나쁜 예시
Wrong date format
Using MM/DD/YYYY instead of the date pickerLeap year misunderstanding
The calculator accounts for leap years automaticallyConfusing Korean age with international age
Korean age counts you as 1 at birth and adds a year every Jan 1 — the calculator uses international (chronological) age흔한 실수
- Leap year misunderstanding - the calculator accounts for leap years
- Using the wrong timezone - dates are timezone-independent
- Not realizing you can set the target date to any past or future date
- Confusing chronological age with biological age — this calculator measures time since birth, not health or fitness level
- Forgetting that insurance companies may use different age calculation methods (age last birthday vs age nearest birthday)
자주 묻는 질문
How accurate is this calculator?
The calculator is accurate to the day. It accounts for leap years and varying month lengths in its calculations.
Does timezone matter?
The calculator uses the dates you enter without considering timezones. For most purposes, this level of accuracy is sufficient.
Can I calculate my age at a future or past date?
Yes — simply change the "Age at Date" field to any date in the past or future. The calculator will show your exact age at that point in time.
How does the calculator handle leap years?
The calculator counts the actual number of days between dates, which includes leap days. It also shows how many leap years have occurred in your lifetime.
What is the difference between chronological age and biological age?
Chronological age is the exact time that has passed since your birth, measured in years, months, and days. Biological age measures how well your body functions relative to average aging — a fit 50-year-old may have the biological age of a 40-year-old. Chronological age is what this calculator measures.
How to calculate age for insurance or legal purposes?
Insurance companies and legal systems typically use your exact age as of a specific cutoff date. Enter your birth date and the relevant cutoff date into the age-at-date field. Some insurers use age at policy start, while others use the age nearest your birthday.
Why is my Korean age different from my international age?
In the Korean age system, you are 1 year old at birth and gain a year every January 1 rather than on your birthday. This means your Korean age is typically 1 to 2 years higher than your international age. This calculator uses the international (standard) age system.
How many days have I been alive since birth?
The calculator shows your total age in days, which counts every day from your birth date to today including all leap days. For example, a 30-year-old has been alive for approximately 10,957 days. This can be a fun way to think about the passage of time.
How do leap years affect age calculation?
Leap years add February 29 every 4 years, so the calculator accounts for these extra days in its total. If you were born on February 29, your birthday technically occurs only on leap years — most systems count February 28 or March 1 as your birthday in non-leap years.