Age Calculator in Years, Months and Days
Enter a date of birth to calculate your age in completed years, remaining months and days, using today's calendar date. Future dates are not accepted.
Your input never leaves your device.
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Everything runs 100% locally in your browser. No files are uploaded to any server.
Formula
Subtract the birth date from today's calendar date. The calculator first counts complete calendar years, then complete months, then the remaining days, adjusting at month boundaries.
Worked example
From 2000-01-15 to 2024-03-20, the calendar age is 24 years, 2 months, and 5 days. The live result uses today's date and your entered birth date.
What the result means
This is a calendar age, not a count of total days or an age at a different date. The result changes with today's local calendar date.
How to Use Age Calculator
Enter your date of birth
Choose a date on or before today.
Read your age
The calculator shows completed years plus the remaining calendar months and days.
Key Features & Benefits
Calendar-based result
The result uses calendar years, months and days rather than converting the full age into an approximate number of days.
Future dates are blocked
A date later than today is rejected instead of producing a negative age.
Frequently Asked Questions
Can I calculate the age between two dates?
Not with this page. It calculates age from a date of birth to today's date.
Does the result include months and days?
Yes. It displays completed years and the remaining calendar months and days.
Why can't I enter a future date?
A future date of birth would result in a negative age, so the date picker only accepts today or an earlier date.
Key terms
- Completed years
- The number of full calendar years elapsed since the date of birth; the remaining time is shown separately as months and days.