Age Calculator
Calculate your exact age from your date of birth. Free, no signup.
How It Works
Enter your date of birth and the tool calculates your exact age in years, months, and days. It also breaks your age down into total days, weeks, and whole months, and counts the days until your next birthday. Change the "Calculate age on" field to find your age on any other date. Everything runs in your browser — your date of birth is never uploaded.
How Age Is Calculated
The calculator subtracts your date of birth from the target date, borrowing days from the previous month and months from the year the same way you would by hand. Because it counts real calendar days, leap years and different month lengths are handled automatically, so the result is your true age rather than a rounded estimate.
Common Uses
Use it to answer "how old am I today", check a child's age in months for growth milestones, confirm your age on a future date such as an exam or retirement day, work out how many days you have been alive, or see exactly how long until your next birthday.
Frequently Asked Questions
How do I calculate my exact age?
Enter your date of birth and the tool shows your exact age in years, months, and days. By default it calculates as of today, but you can change the target date to find your age on any past or future day.
How old am I in days, weeks, and months?
Along with years, months, and days, the calculator shows your total age in days, weeks, and whole months. For example it will tell you that you have lived roughly 10,000 days, so you can see your age from every angle.
How many days until my next birthday?
After you enter your birth date, the result shows a countdown of the number of days until your next birthday, based on the target date. On your birthday itself it shows a Happy Birthday message instead.
Can I calculate my age on a specific date?
Yes. Change the Calculate age on field to any date and the tool works out how old you were, or will be, on that day. This is handy for checking your age on a wedding, an exam date, or a historical event.
Is my date of birth kept private?
Yes. The calculation runs entirely in your browser using JavaScript and nothing is uploaded or sent to a server. Your date of birth never leaves your device.