Pregnancy Due Date
Input parameters
Configure requirements with tools
How to Use This Pregnancy Due Date
Step-by-Step Instructions
- Enter your Pregnancy Due Date values in the input fields above
- Select the appropriate calculation options
- Click the Calculate button
- View your instant results below
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Instructions terms
What is a Pregnancy Due Date Calculator?
A pregnancy due date calculator estimates when your baby will be born based on your last menstrual period (LMP) or ultrasound date.
How to Use This Calculator
Enter the first day of your last menstrual period. The calculator estimates your due date using Naegele's rule.
Naegele's Rule
Due Date = First Day of LMP + 280 days (40 weeks)
Pregnancy Trimesters
- First: Weeks 1-12
- Second: Weeks 13-26
- Third: Weeks 27-40
Important Notes
Only about 5% of babies arrive on their due date. Most arrive within 2 weeks before or after.
FAQ
Can the due date change?
Yes, first trimester ultrasound often refines the due date.