Date of Birth Calculator

Use the Date of Birth Calculator to find your exact age or determine your birth date based on how old you are today. It helps you verify dates for legal documents, astrological charts, or just for fun curiosity.

How do I calculate the date of birth from the age?

If you know someone is exactly "25 years old" today, finding their birth year is simple subtraction. However, precise dates require accounting for leap years and specific month lengths. Our calculator handles this automatically.

Calculation of age from date of birth

By entering your full date of birth (and time, if you want extra precision), we calculate the exact duration elapsed since that moment. This is done by comparing the timestamp of your birth against the current reference timestamp.

How to use our date of birth calculator

1. Ensure the Reference Date is set to today (default).
2. Enter your Date of Birth.
3. The Age field will automatically update to show your age in years.
4. See the Result Box for a breakdown in other units like months, weeks, and days.

You can also work backward! Enter an age (e.g., 10000 days) to see what the date of birth would be.