Age Calculator
Calculate your exact age from your date of birth in years, months and days. See your total days lived, total weeks, and how many days remain until your next birthday.
How to use
- Enter your date of birth.
- Optionally choose a different “calculate age at” date; leave it blank to use today.
- Click Calculate age to see your exact age, total days lived and days until your next birthday.
How is my exact age calculated?
Your exact age is calculated by comparing your date of birth with the chosen reference date, normally today. Whole years are counted first, then whole months, then remaining days, borrowing days and months correctly when needed. Leap years are handled automatically by calendar date maths, not by dividing by 365.
What does total days lived mean?
Total days lived is the full number of days between your date of birth and the reference date. It counts every calendar day, including leap days, and is useful for milestones such as a 10,000th day. Total weeks is simply that day count divided by seven, shown alongside your exact age.
Why does my age differ on different calculators?
Differences usually come from the reference date, time zone or rounding method. Some calculators show only completed years, while others round months or ignore the day of the month. This calculator uses full calendar maths and lets you choose the reference date, so results match your birthday exactly.