How the Due Date Calculator Works

The calculator adds 280 days (40 weeks) to the date of your last menstrual period to estimate the due date. This is based on the average human gestation period. The calculation accounts for the calendar, including leap years.

Steps to Use

• Select the first day of your last menstrual period from the calendar picker.
• Click the "Calculate Due Date" button.
• View your estimated due date.

Accuracy and Limitations

This tool provides a general estimate and is not a substitute for professional medical advice. Actual due dates can vary based on factors like ovulation timing and individual health. Only about 5% of babies are born on their exact due date. Consult your healthcare provider for personalized monitoring.

Frequently Asked Questions

What is a due date?

A due date is an estimated date when a baby is expected to be born, calculated from the first day of the mother's last menstrual period.

How accurate is this calculator?

It is accurate for estimation but not precise; medical ultrasounds provide better accuracy.

Can I use it if I know my conception date?

This calculator is based on LMP; for conception date, add 266 days instead.