Age Calculator
How old are you exactly? Enter your date of birth below to find your precise age in years, months, and days. You can also see your total days lived, weeks old, total months, and how many days remain until your next birthday. Optionally change the "Calculate To" date to find the age difference between any two dates.
How to Calculate Your Exact Age
Calculating your exact age might seem straightforward, but it involves several nuances that make it trickier than simple subtraction. Here is what our calculator accounts for:
- Varying month lengths: Months range from 28 to 31 days, so the number of days in each month must be considered individually when computing age breakdowns.
- Leap years: Every four years (with exceptions for century years not divisible by 400), February has 29 days instead of 28. This affects total day counts significantly over a lifetime.
- Calendar edge cases: If you were born on the 31st of a month and the current month has only 30 days, the calculation needs to handle the overflow correctly.
Our calculator handles all of these edge cases to give you a precise result down to the exact day.
Your Age in Different Units
Beyond years, months, and days, it can be fascinating to see your age expressed in other units:
- Total days: The average person who lives to 80 years old will experience roughly 29,200 days. Seeing your total day count puts time in perspective.
- Total weeks: Each year has approximately 52.18 weeks. By age 30, you have lived through about 1,565 weeks.
- Total months: A 25-year-old has lived exactly 300 months. Milestones like 500 or 1,000 months can be fun markers to celebrate.
- Days until next birthday: Knowing the exact countdown to your next birthday helps with planning celebrations and building anticipation.
Interesting Age Facts
- You share your birthday with approximately 20.5 million other people worldwide (based on a global population of 8 billion and 365 days)
- The most common birthday in the United States is September 9th, approximately nine months after the holiday season
- People born on February 29th (leap day) technically only have a birthday once every four years, though they still age normally
- In some East Asian cultures, a person is considered one year old at birth and gains a year on New Year's Day rather than their birthday
- The oldest verified person ever was Jeanne Calment of France, who lived to 122 years and 164 days
Common Age Calculation Scenarios
People use age calculators for many practical reasons:
- Official documents: Visa applications, insurance forms, and government documents often require your exact age in years, months, and days.
- Milestone celebrations: Calculating exactly when you will turn 10,000 days old or reach 1,000 weeks makes for a unique celebration.
- Age requirements: Checking if you meet the exact age requirement for driving, voting, drinking, or retirement benefits.
- Medical contexts: Pediatricians calculate exact age in months and days for growth charts and developmental milestones.
- Historical research: Finding the exact age of historical figures at the time of major events.
Frequently Asked Questions
How to calculate exact age from date of birth?
To calculate your exact age, subtract your birth date from today's date. Start with the days: if today's day is less than your birth day, borrow a month. Then subtract months: if today's month is less than your birth month, borrow a year. Finally subtract the years. Our calculator handles all of this automatically, including leap years and varying month lengths.
How many days old am I?
To find how many days old you are, enter your birth date in our age calculator. It computes the exact number of days between your birthday and today (or any target date). For example, someone born on January 1, 2000 would be over 9,500 days old by 2026. The calculator accounts for leap years, so the count is precise.
How to calculate age between two dates?
Our age calculator lets you calculate the difference between any two dates, not just from a birth date to today. Simply enter the start date in the "Date of Birth" field and the end date in the "Calculate To" field. The calculator will show the exact years, months, days, total days, and total weeks between the two dates.