Age Calculator
Enter a date of birth and an as-of date to see your exact age in years, months, and days, along with how many days you've lived and how many are left until your next birthday.
Last updated July 19, 20263 min read
Years
31
Months
1
Days
13
Total days lived
11366
Days until next birthday: 322
How to use
- 1
Pick a date of birth
Use the date picker or type in YYYY-MM-DD.
- 2
Set the as-of date
Defaults to today. Change it to calculate at any past or future date.
- 3
Review the results
Age in years/months/days, total days lived, and countdown to the next birthday.
Benefits
- Handles leap years and month lengths correctly.
- Works for any date — past, present, or planning ahead.
- Shows total days lived, useful for milestones.
- Runs entirely in your browser.
Common uses
- Age verification for forms and applications
- Planning birthday celebrations
- Historical or genealogy research
- Counting milestones like 10,000 days lived
Frequently asked questions
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