Due Date Calculator Baby

Use our due date calculator to determine your estimated delivery date based on your last menstrual period (LMP) or ultrasound date. This calculator provides a quick and accurate estimate of when you might expect your baby to arrive.

How to Use This Calculator

To calculate your due date, follow these simple steps:

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

The calculator will display your estimated due date, as well as additional information about your pregnancy timeline.

Formula Used

The due date is calculated based on the average length of a full-term pregnancy, which is 40 weeks (280 days) from the first day of the last menstrual period.

Formula

Due Date = Last Menstrual Period + 280 days (40 weeks)

For ultrasound dates, the due date is calculated as:

Due Date = Ultrasound Date + (280 days - Gestational Age in Days)

This formula provides an estimate and may vary based on individual factors.

Worked Example

Let's say your last menstrual period was on January 1, 2023. Using the formula:

Example Calculation

Due Date = January 1, 2023 + 280 days

Due Date = October 28, 2023

Therefore, your estimated due date would be October 28, 2023.

Interpreting Results

The due date provided by this calculator is an estimate. Actual delivery dates can vary, and it's always a good idea to consult with your healthcare provider for personalized advice.

The calculator also provides a timeline showing key pregnancy milestones based on your due date.

Important Note

This calculator provides an estimate only. Always consult with your healthcare provider for medical advice.

Frequently Asked Questions

How accurate is the due date calculator?: The calculator provides an estimate based on average pregnancy lengths. Individual pregnancies may vary.
Can I use this calculator for multiple pregnancies?: Yes, you can use the calculator for each pregnancy separately by entering the relevant dates.
What if I don't know my last menstrual period?: If you have an ultrasound date, you can use that instead to calculate your due date.
How do I know if my pregnancy is on schedule?: Consult with your healthcare provider for personalized advice about your pregnancy timeline.
Is the due date the same as the expected delivery date?: Yes, the due date is the estimated date of delivery based on your last menstrual period or ultrasound date.