When Will I Deliver Baby Calculator

Pregnancy is a journey, and knowing your estimated due date can help you plan for the arrival of your baby. Our due date calculator helps you estimate when you'll deliver your baby based on your last menstrual period or ultrasound date.

How to Use This Calculator

To calculate your estimated due date, follow these simple steps:

Enter your last menstrual period date (LMP) or ultrasound date in the calculator.
Select whether you're using the LMP method or ultrasound method.
Click the "Calculate" button to see your estimated due date.
Review the result and any additional information provided.

Note: This calculator provides an estimate. Actual due dates may vary. Always consult with your healthcare provider for personalized advice.

Formula Used

The calculator uses the standard pregnancy duration of 40 weeks (280 days) from the first day of your last menstrual period (LMP).

Estimated Due Date = Last Menstrual Period Date + 280 days

For ultrasound dates, the calculator uses the gestational age at the time of the ultrasound to calculate the estimated due date.

Worked Example

Let's say your last menstrual period started on January 1, 2023. Using the calculator:

Enter January 1, 2023 as your LMP date.
Select "LMP Method".
Click "Calculate".

The calculator will show that your estimated due date is October 29, 2023 (280 days after January 1, 2023).

Interpreting Results

The estimated due date is calculated based on the average length of pregnancy. Here's what the different terms mean:

Estimated Due Date: The calculated date when your baby is expected to be born, based on your LMP or ultrasound date.
Gestational Age: The length of time since conception, calculated from your LMP or ultrasound date.
First Trimester: The first 12 weeks of pregnancy, when many basic structures of the baby are formed.
Second Trimester: Weeks 13 to 26 of pregnancy, when the baby's organs continue to develop.
Third Trimester: Weeks 27 to 40 of pregnancy, when the baby grows rapidly and prepares for birth.

FAQ

How accurate is the due date calculator?: The calculator provides an estimate based on average pregnancy lengths. Actual due dates may vary by several days or more.
Can I use this calculator if I had an ultrasound?: Yes, you can enter your ultrasound date and select the "Ultrasound Method" to calculate your estimated due date.
What if my period was irregular?: The calculator uses the first day of your last menstrual period. If your periods are irregular, you may want to consult with your healthcare provider.
How do I know if my baby is full-term?: A full-term baby is typically born between 37 and 42 weeks of gestation. The calculator will indicate if your estimated due date falls within this range.
Should I trust this calculator over my doctor's advice?: This calculator provides a general estimate. Always consult with your healthcare provider for personalized medical advice.