Age Calculator
Enter a birth date to instantly calculate exact age in years, months, and days, along with total days lived and days remaining until the next birthday — calculated entirely on your device.
Calculators Runs entirely in your browser
All calculations happen on your device — your birth date is never sent to a server.
What this tool does
Calculates an exact age from a date of birth in years, months and days, with the total days since birth and the days remaining until the next birthday.
When to use it
- Filling in a form that wants an age in precise years and months.
- Working out a child's age in months for a medical or school record.
- Finding out how many days remain until an occasion.
- Checking whether an age requirement is met on a particular date.
How to use it
- Pick the "Date of birth".
- Click "Calculate age".
- Read the age, the total days since birth, and the days until the next birthday.
A practical example
Input
A date of birth in mid-1990.
Output
The age in years, months and days, the total days lived, and the count to the next birthday.
Limitations
- The date of birth must be in the past; a future date is rejected with a clear message.
- The calculation uses the Gregorian calendar; for the Hijri equivalent, use the Hijri–Gregorian converter.
- It works from today's date on your device, so a device with the wrong date gives the wrong answer.
Privacy and processing
All calculations happen on your device and your birth date is never sent to a server.
Technical notes
- The calculation accounts for differing month lengths and leap years, so the result is exact rather than days divided by 365.