Find your exact age in years, months and days from your date of birth, plus total weeks, days and a countdown to your next birthday.
Age matters on job applications, school admissions, passports, insurance and retirement plans, and it is easy to get it wrong by a month or a day around a birthday. This age calculator counts the exact calendar difference, handles leap years and February 29 birthdays, and shows how many days are left until your next birthday.
How do I calculate my exact age?
Subtract your birth year from the current year, then subtract 1 if your birthday has not happened yet this year. For months and days, count the full months since your last birthday and the days since the last month mark. For example, someone born on June 15, 1995 is 31 years, 3 months and 20 days old on October 5, 2026.
Age in different units
| Age | Months | Weeks (approx.) | Days (approx.) |
|---|---|---|---|
| 1 year | 12 | 52 | 365 |
| 18 years | 216 | 939 | 6,574 |
| 21 years | 252 | 1,096 | 7,670 |
| 30 years | 360 | 1,565 | 10,957 |
| 50 years | 600 | 2,609 | 18,262 |
| 65 years | 780 | 3,392 | 23,741 |
What about leap-day birthdays?
If you were born on February 29, you officially turn a year older on February 28 or March 1 in non-leap years, depending on local law. This calculator treats March 1 as the birthday in non-leap years, which is the rule used in the UK, Hong Kong and for many legal purposes in the US.
How to use the Age Calculator
Enter your date of birth
Pick your birth date from the calendar or type it in.
Choose the "age on" date
It starts on today. Change it to see your age on a past or future date, such as a deadline or retirement date.
Read your exact age
Your age appears in years, months and days, with total months, weeks, days and the countdown to your next birthday.
How is age counted in Korea and other East Asian countries?
Most of the world uses international age: you are 0 at birth and gain a year on each birthday. This calculator uses that system. Some East Asian traditions count differently.
Traditional Korean age starts at 1 at birth and adds a year for everyone on January 1. A baby born on December 31 would be 2 years old the next day. South Korea also used a “year age” for some laws, which is the current year minus the birth year. On June 28, 2023, amendments to the Civil Act and the Framework Act on Public Administration took effect, making international age the standard for legal and administrative purposes. A few laws, such as those on alcohol, tobacco and military service, still use year age.
Japan’s traditional count, kazoedoshi, worked much like Korean age. The 1902 Act on Calculation of Age switched legal age to completed years, and a 1949 law encouraged everyday use of the same method. To check exact gaps between two dates, the days between dates calculator gives a full day count.
Does my age change at midnight on my birthday?
In everyday life, yes. In law, the answer depends on the country. Under the old common law of England, a person was treated as reaching a new age at the first moment of the day before their birthday, because the law did not count fractions of a day. In England and Wales, section 9 of the Family Law Reform Act 1969 changed this so that a person attains an age at the start of the anniversary of their birth.
Japan still follows the older idea. Under the Act on Calculation of Age, a person turns a year older at the end of the day before their birthday. That is why Japanese children born on April 1 start school a year earlier than children born on April 2, since the school year begins on April 1.
Age can also differ by calendar. The Hijri calendar year has 354 or 355 days, about 11 days shorter than the Gregorian year, so a person’s age in Hijri years is slightly higher. The Hijri date converter finds your birth date in that calendar.
Frequently asked questions
How old am I if I was born in 2000?
On October 5, 2026 you are 26 if your birthday has passed this year, or 25 if it has not. Enter your full birth date for the exact answer.
Does the age calculator count leap years?
Yes. It uses real calendar dates, so every leap day is included in total days and weeks.
How do I calculate age on a specific date?
Change the “Age on this date” field to any date. It is useful for exam cut-off dates, visa forms and retirement planning.
How many days until my birthday?
The “Next birthday” box shows the number of days left and updates as you change the dates.
Is my date of birth stored?
No. The calculation runs in your browser and nothing is sent to a server.
Sources and further reading
Related tools
Last reviewed: October 2026