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About This Calculator
Instantly find your exact age in years, months, and days — plus the total number of months, weeks, and days you've been alive. Great for birthdays, anniversaries, or any "how long ago" question.
How It Works
- Enter your date of birth (required)
- Leave "Calculate As Of" empty to use today's date
- Results show precise years / months / days and totals
If you enter a future "as of" date or a birth date after that date, the result is left blank.
Frequently Asked Questions
How accurate is this age calculator?
It calculates the exact elapsed calendar time between your birth date and today (or your chosen date), accounting for varying month lengths and leap years. The result is precise to the day.
Can I calculate age as of a past or future date?
Yes. Use the optional “Calculate As Of” field to pick any date. Leave it empty to calculate your age as of today.
Why does it show a dash before I enter a date?
The dash is a placeholder shown until a valid birth date is entered (and, when using today’s date, until the page finishes loading). Enter your birth date to see the result.