Expected Baby Due Date Calculator

How to Use This Calculator

To calculate your expected due date:

1. Enter the date of your last menstrual period (LMP) or the date of your confirmed ultrasound.
2. Select whether you're using the LMP date or ultrasound date.
3. Click "Calculate" to see your estimated due date.

The calculator will show you the expected due date, the number of weeks and days until that date, and a visual timeline of your pregnancy.

How Due Date Calculations Work

Pregnancy is typically measured in weeks and days from the first day of your last menstrual period (LMP). The average pregnancy lasts 40 weeks (280 days).

Ultrasound dates are more precise and are often used when the LMP is uncertain. The ultrasound date is typically measured from the first day of the woman's last menstrual period to the date of the ultrasound.

If you have an ultrasound date, the calculator will use that instead of the LMP date to provide a more accurate estimate.

Common Mistakes to Avoid

When calculating your due date, it's important to avoid these common mistakes:

• Using the wrong starting date: Always use the first day of your last menstrual period (LMP) or the date of your confirmed ultrasound.
• Counting from the wrong day: The LMP date is typically counted as day 1 of pregnancy, not the day after your period ends.
• Assuming a fixed due date: Due dates can vary by a week or two, so it's important to use the calculator for an accurate estimate.