Age Calculator
Find your exact age in years, months and days. Totals in months, weeks, days and hours, the weekday you were born, and a countdown to your next birthday. Free and private.
Why use this age calculator
An age seems simple — just subtract the birth year — but an exact age in years, months and days is trickier: months have different lengths, and leap years shift the math. This calculator does the calendar arithmetic for you: enter your date of birth and get your precise age today, plus totals in months, weeks, days and hours.
What it shows
- Exact age in years, months and days, valid across leap years and month lengths.
- Totals: whole months, weeks, days and hours you have lived.
- The weekday of your birth and a countdown to your next birthday, including the age you will turn.
How to use
- Enter your date of birth.
- Optionally change the "age as of" date — the default is today.
- Read the exact age, totals and next-birthday countdown. Copy the result with one click.
How it works
The calculator uses real calendar arithmetic in your browser: month lengths, leap years and day boundaries are all respected. Nothing is uploaded — the computation runs entirely on your device.
Frequently asked questions
How is exact age calculated?
The calculator counts full years first, then full months, then the remaining days, borrowing days from the previous month where needed — the same way calendars work. Leap years are handled automatically.
Can I calculate age at a past or future date?
Yes. Change the "age as of" date to any date — for example, how old you were on a specific day, or how old you will be at an upcoming event. The date must not be earlier than the date of birth.
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