About the Pregnancy Due Date Calculator

This calculator estimates your baby's due date based on the first day of your last menstrual period. It uses the standard Naegele's rule, which adds 280 days (40 weeks) to the first day of your last period.

How to Use:

1. Enter the first day of your last menstrual period
2. Enter your average cycle length (default is 28 days)
3. Click "Calculate Due Date" to see your results