Baby Is Due Calculator
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Reviewed by Calculator Editorial Team
Pregnancy is an exciting time, and knowing your baby's due date can help you plan for the arrival. Our baby is due calculator helps you determine your estimated due date based on your last menstrual period or ultrasound date.
How to Use This Calculator
Using our baby is due calculator is simple. You have two options to calculate your due date:
- Based on your last menstrual period: Enter the date of your last menstrual period and our calculator will estimate your due date by adding 40 weeks to that date.
- Based on your ultrasound date: If you've had an ultrasound, enter the date of the ultrasound and the estimated gestational age in weeks. Our calculator will then calculate your due date by adding the remaining weeks to the ultrasound date.
After entering the required information, click the "Calculate" button to see your estimated due date. You can also reset the calculator to start over.
How the Due Date is Calculated
The standard gestational period is 40 weeks. When you enter your last menstrual period date, our calculator adds 40 weeks to that date to estimate your due date.
Formula
Due Date = Last Menstrual Period + 40 weeks
If you provide an ultrasound date and estimated gestational age, the calculation is slightly different. The calculator adds the remaining weeks to reach 40 weeks to the ultrasound date.
Formula
Due Date = Ultrasound Date + (40 weeks - Gestational Age)
These calculations provide an estimate, and actual due dates can vary. Always consult with your healthcare provider for the most accurate information.
Example Calculation
Let's say you had your last menstrual period on January 1, 2023. Using our calculator:
- Enter January 1, 2023 as your last menstrual period date.
- Click "Calculate".
- The calculator will add 40 weeks to January 1, 2023, resulting in October 28, 2023 as your estimated due date.
This example shows that if you had your last period on January 1, your baby would be due around October 28.
Frequently Asked Questions
How accurate is the baby is due calculator?
Our calculator provides an estimate based on standard gestational periods. Actual due dates can vary, so it's always best to consult with your healthcare provider for the most accurate information.
Can I use this calculator if I've had an ultrasound?
Yes, you can enter your ultrasound date and estimated gestational age to get a more precise due date estimate.
What if I don't know my last menstrual period date?
If you don't know your last menstrual period date but have an ultrasound, you can use the ultrasound option to estimate your due date.
Is the due date the same as the expected delivery date?
The due date is an estimate of when your baby is expected to be born. However, labor can start anytime from 2 weeks before to 2 weeks after the due date.