Calculator Age Calculator
Exact age to the day, next birthday countdown, and calculate between any two dates.
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About this calculator
Enter a date of birth and an "as of" date (defaults to today) to see the exact age in multiple units. The result includes years, months, and days; total months; total weeks; total days; and days until the next birthday.
How to use it
- Enter the date of birth.
- The Age as of date defaults to today — leave it or change it to calculate age at a different point in time.
- Click Calculate Age.
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Common uses
- Finding exact age for legal or official documents
- Calculating age at a specific historical date
- Days until your next birthday
- Verifying age eligibility (retirement, voting, etc.)
- Genealogy and family history research
FAQ
- How accurate is the age calculation?
- Accurate to the day, including leap years. Shows exact years, months, and days.
- Can I see when my next birthday is?
- Yes — the calculator shows the date and days remaining until your next birthday.
- Can I calculate the age between any two dates?
- Yes — change the reference date from today to any date in the past or future.