When Will I Deliver My Baby Calculator
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Reviewed by Calculator Editorial Team
Pregnancy due dates are estimated based on either your last menstrual period (LMP) or your ultrasound date. This calculator helps you determine your expected delivery date using standard medical guidelines.
How to Use This Calculator
To calculate your estimated due date:
- Select whether you want to use your last menstrual period (LMP) 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 provide additional information about your pregnancy timeline.
How Pregnancy Due Date Is Calculated
There are two main methods for calculating an estimated due date:
Last Menstrual Period (LMP) Method
The standard method adds 280 days (40 weeks) to your last menstrual period date. This is based on the average length of a full-term pregnancy.
Ultrasound Method
When you have an ultrasound, the doctor measures the gestational sac and may estimate your due date based on the fetal development. The formula typically used is:
Where Gestational Age is the number of weeks and days since conception as determined by the ultrasound.
Note: These calculations are estimates. Your actual due date may vary by several days. 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 the LMP method:
Your estimated due date would be October 28, 2023.
Frequently Asked Questions
How accurate is the due date calculator?
The calculator provides an estimate based on standard medical guidelines. Your actual due date may vary by several days. For the most accurate information, consult with your healthcare provider.
Can I use this calculator if I had an ultrasound?
Yes, you can use the ultrasound method by entering your ultrasound date and the gestational age determined by your doctor.
What if my period is irregular?
The LMP method works best with regular cycles. If your cycles are irregular, the ultrasound method may provide a more accurate estimate.
When should I contact my healthcare provider?
You should contact your healthcare provider if you experience any complications during pregnancy or if your due date changes significantly.