Age Calculator
Calculate exact age in years, months, and days from date of birth.
Overview
This tool calculates your exact age in years, months, and days given a date of birth and a reference date. It is more precise than simple year subtraction because it accounts for varying month lengths and leap years. The result is useful for filling forms, verifying ID documents, calculating milestone anniversaries, and determining eligibility for age-restricted services.
Common use cases
- Verify age for legal or medical eligibility requirements.
- Calculate exact age for school admission cutoffs.
- Determine days or months until a birthday milestone.
- Cross-check date-of-birth entries on government forms.
Examples and notes
- A person born on March 15, 1990 is not simply 35 years old on March 1, 2025 — they are 34 years, 11 months, and 14 days.
- Leap year birthdays (Feb 29) are handled correctly by counting the nearest valid date.
- For a future reference date, the calculator gives a projected age at that point in time.
Important note
For legal and regulatory age verification, always use official documents. This tool performs calendar arithmetic only and cannot be used as a substitute for government ID verification.
Frequently Asked Questions
Does this calculator include months and days?
Yes. Results show full years, remaining months, and remaining days — not just the year count.
Which timezone is used?
The server uses the calendar date you enter. For maximum accuracy, use today's date in your local timezone.
Can I calculate age on a future date?
Yes. Set the reference date to any future date and the tool will project your age on that day.
Why does my age show differently near a birthday?
The calculator uses strict calendar arithmetic, so your age increments on the exact calendar date of your birthday, accounting for leap years.