Age Calculator
Calculate your exact age in years, months, and days. Find out how many days until your next birthday and see your age in different units.
Leave blank to calculate age as of today
Enter your birth date to calculate your age.
How It Works
This calculator computes the exact time elapsed between your birth date and today (or a date you specify). It accounts for varying month lengths and leap years to give you a precise breakdown in years, months, and days.
The total days calculation counts every day from birth to the target date. Weeks are calculated by dividing total days by 7. These totals can be interesting to track milestones like your 10,000th day alive.
Age calculations can vary slightly depending on methodology—some systems count the day of birth as day 0, others as day 1. This calculator counts from birth date to the target date, so on your birthday, you've completed that many years.
Frequently Asked Questions
How is age legally defined?
In most countries, you "turn" a new age at the start of your birthday. Some jurisdictions use the day before (Korea traditionally added a year at New Year). For legal purposes like voting or drinking age, check your local laws for the specific time (midnight, birth time, etc.).
What if I was born on February 29?
Leap day babies (leaplings) typically celebrate on February 28 or March 1 in non-leap years. Legally, most jurisdictions consider March 1 as the anniversary date in non-leap years. You'll have the same number of years as everyone else, just fewer actual birthday dates.
What are some interesting age milestones?
Common milestones include: 1,000 days old (~2.7 years), 10,000 days old (~27.4 years), 1 billion seconds old (~31.7 years), 20,000 days old (~54.8 years). These alternative milestones can be fun to celebrate.
How does age verification work online?
Most websites simply ask for your birth date and calculate if you meet the minimum age requirement. This is often just a legal formality and easily bypassed. More stringent verification may require ID documents.