When Will Your Baby Be Born Calculator
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Reviewed by Calculator Editorial Team
Pregnancy is an exciting time, and knowing your baby's expected due date can help you plan for the arrival. Our due date calculator helps you estimate when your baby will be born based on your last menstrual period (LMP).
How to Use This Calculator
Using our due date calculator is simple. Follow these steps:
- Enter the date of your last menstrual period (LMP) in the calculator.
- Click the "Calculate" button.
- Review the estimated due date and other pregnancy milestones.
The calculator will provide you with an estimated due date, as well as important pregnancy milestones based on your LMP.
How the Due Date Calculation Works
The standard method for calculating a due date is based on the first day of your last menstrual period (LMP). The average pregnancy lasts 40 weeks (280 days), so the due date is calculated by adding 280 days to the LMP.
For example, if your LMP was January 1, 2023, your due date would be October 9, 2023.
This method provides a general estimate. Actual due dates can vary, and medical professionals may use ultrasound measurements for more precise calculations.
Example Calculation
Let's say your last menstrual period started on May 15, 2023. Here's how the calculation works:
Therefore, your estimated due date would be February 12, 2024.
Important pregnancy milestones based on this example:
- First trimester: May 15 - August 12, 2023
- Second trimester: August 13 - November 9, 2023
- Third trimester: November 10, 2023 - February 12, 2024
Frequently Asked Questions
How accurate is the due date calculator?
The due date calculator provides an estimate based on your last menstrual period. For more precise information, medical professionals may use ultrasound measurements.
Can I use this calculator for multiple pregnancies?
Yes, you can use this calculator for each pregnancy separately by entering the last menstrual period date for each pregnancy.
What if I don't remember my exact last menstrual period date?
If you're unsure of your exact LMP date, you can estimate based on your menstrual cycle length. Most women have cycles that are 28 days long, but this can vary.