Baby Dob Calculator
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Reviewed by Calculator Editorial Team
Use our baby due date calculator to estimate your baby's expected due date based on your last menstrual period (LMP) or ultrasound date. This tool provides an estimate of when you might expect your baby to arrive, though keep in mind that actual due dates can vary.
How to Use the Baby Due Date Calculator
Using our baby due date calculator is simple. Follow these steps to get an estimate of your baby's due date:
- Enter the date of your last menstrual period (LMP) or the date of your ultrasound.
- Select whether you're using the LMP method or the ultrasound method.
- Click the "Calculate" button to get your estimated due date.
- Review the result and any additional information provided.
The calculator uses standard gestational periods to estimate your due date. The average pregnancy lasts 40 weeks (280 days), but individual pregnancies may vary.
Calculation Method
The baby due date calculator uses the following methods to estimate your due date:
Last Menstrual Period (LMP) Method
This method adds 280 days (40 weeks) to the first day of your last menstrual period to estimate your due date.
Formula
Due Date = Last Menstrual Period + 280 days
Ultrasound Method
This method uses the gestational age from your ultrasound to estimate your due date.
Formula
Due Date = Ultrasound Date + (280 days - Gestational Age in Days)
Note
These are estimates only. Actual due dates can vary by several days or more. Always consult with your healthcare provider for the most accurate information.
Example Calculation
Let's look at an example to see how the baby due date calculator works.
Example 1: Using Last Menstrual Period
If your last menstrual period started on January 1, 2024, the calculator would estimate your due date as follows:
Calculation
Due Date = January 1, 2024 + 280 days = October 28, 2024
Example 2: Using Ultrasound
If you had an ultrasound on March 15, 2024, and your baby was 12 weeks and 3 days old, the calculator would estimate your due date as follows:
Calculation
Gestational Age in Days = (12 weeks × 7 days/week) + 3 days = 87 days
Due Date = March 15, 2024 + (280 days - 87 days) = December 10, 2024
Frequently Asked Questions
How accurate is the baby due date calculator?
The baby due date calculator provides an estimate based on standard gestational periods. However, actual due dates can vary by several days or more. For the most accurate information, consult with your healthcare provider.
Can I use this calculator for a pregnancy that has already started?
Yes, you can use the calculator for any pregnancy. If you know your last menstrual period date or have had an ultrasound, you can use either method to estimate your due date.
What if my pregnancy is high-risk?
If you have a high-risk pregnancy, the calculator's estimate may not be accurate. Always consult with your healthcare provider for personalized advice and monitoring.
Can I save my due date calculation?
This calculator does not save your data. For important records, consult with your healthcare provider or use a dedicated pregnancy tracking app.