Baby Due Date Calculator Based on Due Date

How to Use This Calculator

Using our baby due date calculator is simple:

1. Select whether you're calculating based on your last menstrual period or ultrasound date.
2. Enter the relevant date in the provided field.
3. Click "Calculate" to see your estimated due date.
4. Review the result and any additional information provided.

The calculator will provide your estimated due date, which is typically calculated as 40 weeks (280 days) after your last menstrual period or the date of your ultrasound.

How the Due Date Calculation Works

The standard calculation for a baby's due date is based on the assumption that a full-term pregnancy lasts 40 weeks (280 days) from the first day of the last menstrual period.

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

If you have an ultrasound, the calculation is adjusted based on your baby's gestational age at the time of the scan.

Example Calculation

Let's say you had your last menstrual period on March 15, 2023. Here's how the calculation would work:

1. Start with March 15, 2023.
2. Add 280 days to this date.
3. The result is December 12, 2023.

Therefore, your estimated due date would be December 12, 2023.