Age Calculator
Calculate exact chronological age in years, months, weeks, days, and hours with leap year accuracy and next birthday countdown.
Enter your date of birth
Select a birth date and reference date, then click Calculate Age to see detailed age breakdowns and your next birthday countdown.
How to Use Age Calculator
- Enter Date of Birth: Pick your birth date from the calendar picker or type it in YYYY-MM-DD format.
- Set Reference Date: Keep 'Today' as the default reference date, or choose a custom past or future milestone date.
- Calculate Age: Click 'Calculate Exact Age' to view your chronological breakdown.
- Explore Age Metrics: Inspect your exact age in years/months/days, total days lived, hours, and next birthday countdown.
Frequently Asked Questions
How does this calculator account for leap years?
Our algorithm computes exact Gregorian calendar intervals, precisely accounting for 366-day leap years and 29-day Februaries across your entire lifespan.
How are birthdays on February 29th handled during non-leap years?
For individuals born on a leap day (Feb 29), non-leap year birthdays are celebrated and counted on February 28th.
Can I calculate my age at a specific future or past date?
Yes! You can adjust the 'Age at Date of' input to any custom date to find out how old you were or will be on that specific day.
What time units are displayed in the results?
Results include a primary 'Years, Months, Days' headline, followed by total weeks, total days, total hours, total minutes, and total months lived.
How does the Next Birthday Countdown work?
It calculates the exact number of days remaining until your next birthday anniversary and displays the day of the week it falls on.
Is my birthdate recorded or stored anywhere?
Never. Calculations run 100% in your local web browser session and are never transmitted over the internet.