Age calculation is more nuanced than simply subtracting years. This calculator accounts for the exact number of days in each month, leap years, and the day-of-month boundary.
People born on February 29 (leap day) officially celebrate their birthday on February 28 or March 1 in non-leap years, depending on convention. This calculator uses February 28 as the observed birthday in non-leap years for counting purposes.
The most accurate way to determine your age is to count full years first, then count the remaining months, and finally count the remaining days — not simply divide total elapsed days by 365. Dividing by 365 introduces small errors because months have different lengths (28 to 31 days), and leap years add an extra day every four years. This calculator uses the year-month-day method, which matches how age is understood legally and socially.
Someone born on August 14, 1990, calculated as of April 16, 2026, is exactly 35 years, 8 months, and 2 days old. Here is how that breaks down: from 1990 to 2025 is 35 full years; from August 14 to April 14 adds 8 months; from April 14 to April 16 adds 2 more days. That same person has lived approximately 12,998 days in total.
February 29 only exists in leap years, which occur every four years. For the other three years, the legal treatment varies by jurisdiction. In most Canadian provinces and in the United States, a February 29 birthday is legally observed on March 1 in non-leap years for purposes such as driver's licences and age-of-majority eligibility. Some individuals and families personally celebrate on February 28. This calculator uses February 28 as the observed date for day-counting purposes.
Contracts, insurance policies, and clinical trials often require a person's exact age in years and sometimes in days. Insurance actuarial tables use age-last-birthday or age-nearest-birthday conventions, which can affect premiums. Clinical trial eligibility windows (for example, "18 to 65 years of age") are typically calculated to the day, meaning a person who turns 65 on the first day of a trial may be ineligible. Knowing your precise age in days can matter in these contexts.
In the traditional Korean age system, a person is counted as 1 year old at birth and gains another year on January 1 of each new year — not on their actual birthday. This means a baby born on December 31 is considered 2 years old the very next day. South Korea officially adopted the international (Western) age system for legal and administrative documents in June 2023, but the traditional system remains culturally familiar in everyday conversation.
Knowing exactly how many days remain until your next birthday is useful for planning celebrations, but it also has practical applications. Children's benefit programs, senior discount cards, and membership tiers often activate on a specific birthday. The countdown shown by this calculator updates based on today's date, giving you a precise day count rather than a rough estimate.
This free age calculator tells you exactly how old you are in years, months, and days as of today. Beyond just your age, it also shows how many days you have lived, how many days remain until your next birthday, your Chinese zodiac sign, and your Western star sign. It is the most detailed age calculator available online — all for free, with no sign-up required.
Whether you need to verify your age for a legal form, find out if you are eligible for a senior discount, or simply satisfy your curiosity, this age calculator gives you an instant and precise answer. The calculator updates in real time based on today's date, so you never need to do the math yourself.
To calculate your exact age, start by counting full years between your birth date and today, then count the remaining full months, and finally count the leftover days. Dividing total days by 365 is less precise because months have different lengths and leap years add an extra day. Enter your date of birth above and this calculator handles all of that automatically.
The age of majority in Canada is 18 in Alberta, Manitoba, Ontario, Prince Edward Island, Quebec, and Saskatchewan, and 19 in all other provinces and territories. At 18 you can vote in federal elections and are subject to the adult criminal justice system in most provinces. The legal drinking age is 18 in Alberta, Manitoba, and Quebec, and 19 elsewhere.
February 29 only exists during leap years (every four years). In non-leap years, most Canadian and US jurisdictions legally observe a leap-day birthday on March 1 for official documents such as driver's licences. Many people celebrate personally on February 28. This calculator uses February 28 as the reference date for day-counting in non-leap years.
In the traditional Korean age system, everyone is considered 1 year old at birth and gains a year on January 1 each year rather than on their individual birthday. A baby born on December 31 is therefore 2 years old the very next day. South Korea officially adopted the international age system for legal purposes in June 2023, though the traditional counting is still culturally familiar.
Enter your date of birth in the calculator above and it will instantly display your total days lived. The figure is calculated by finding the number of milliseconds between your birth date and today, then dividing by 86,400,000 (the number of milliseconds in one day). Leap years are accounted for automatically.
Enter the person's date of birth in the Date of Birth field, then set the "Calculate Age As Of" field to today or any reference date you need. The calculator will display their exact age in years, months, and days, plus total days, weeks, and months lived. This is useful for verifying age on legal forms, insurance applications, and medical records.
You can begin receiving Canada Pension Plan (CPP) retirement benefits as early as age 60, but your monthly payment is reduced by 0.6% for each month before age 65 (up to a 36% reduction). The standard starting age is 65. If you delay past 65, your benefit increases by 0.7% per month, up to a maximum 42% increase at age 70. Old Age Security (OAS) follows a similar structure, starting at 65 and deferrable to 70.
Differences occur because calculators use different methods. Some divide total elapsed days by 365, others by 365.25 to approximate leap years. The most accurate approach — used here — counts full calendar years, then remaining months, then remaining days. This matches the legal and social definition of age and avoids rounding errors that accumulate over a lifetime.