The month and day breakdown handles short months and leap-year boundaries.
age calculator
Calculate exact age from any birth date.
Enter a birth date and an as-of date to see exact years, months, days, and total days lived.
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Use the as-of field for school forms, eligibility dates, milestones, and historical age checks.
How to use the Age Calculator
- 1
Enter the birth date.
- 2
Choose the date to calculate age on.
- 3
Read the exact years, months, days, and total days.
Frequently asked questions
Does the age calculator support past or future as-of dates?
Yes. You can set the as-of date to today, a past date, or a future date.
How are leap years handled?
The calculation accounts for calendar month lengths and leap-year boundaries when breaking age into years, months, and days.
Can I calculate age for forms and eligibility dates?
Yes. Set the as-of date to the form deadline or eligibility date to get the exact age on that day.
Is my birth date stored online?
No. Inputs are processed in the browser and the last value is only stored locally on your device.
Can I share an age calculation?
Yes. The copy link button includes the selected dates in the page URL.
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