When Will My Baby Be Due Calculator

Pregnancy due dates are calculated based on the first day of your last menstrual period (LMP) or the date of your ultrasound. This calculator helps you estimate when your baby is expected to be born.

How to Use This Calculator

To calculate your due date:

Select whether you want to calculate based on your last menstrual period or ultrasound date.
Enter the relevant date (LMP or ultrasound date).
Click "Calculate" to see your estimated due date.

The calculator will display your estimated due date and show you the pregnancy timeline.

How Pregnancy Due Dates Are Calculated

Pregnancy due dates are typically calculated based on the first day of your last menstrual period (LMP). The standard calculation adds 40 weeks (280 days) to the first day of your last period.

Formula Used

Due Date = Last Menstrual Period + 280 days

For ultrasound dates, the calculation is based on the gestational age at the time of the scan plus the date of the scan.

For example, if your last menstrual period started on January 1, 2023, your due date would be October 31, 2023 (280 days later).

Important Note

Due dates are estimates. Every pregnancy is different, and your due date may change as your pregnancy progresses. Always consult with your healthcare provider for the most accurate information.

Example Calculation

Let's say your last menstrual period started on May 15, 2023. Using the calculator:

Select "Last Menstrual Period" as the calculation method.
Enter May 15, 2023 as the date.
Click "Calculate".

The calculator will show that your estimated due date is February 12, 2024.

This is calculated by adding 280 days to May 15, 2023.

Frequently Asked Questions

How accurate is the due date calculator?

The calculator provides an estimate based on standard pregnancy calculations. Actual due dates may vary, so always consult with your healthcare provider for the most accurate information.

Can I use this calculator if I had an ultrasound?

Yes, you can use the calculator with your ultrasound date. Select "Ultrasound Date" as the calculation method and enter the date of your scan along with the gestational age at that time.

What if my due date changes during pregnancy?

Due dates can change as your pregnancy progresses. Regular prenatal visits help monitor your baby's growth and adjust the due date if needed.

Is the due date the same as the baby's birthday?

No, the due date is an estimate of when your baby is expected to be born. Babies are often born a few days before or after the due date.