What if my cycles are irregular?
Use your best average. For significantly irregular cycles, confirm timelines with an ultrasound for maximum accuracy.
Step-by-step walkthrough
Pregnancy Due Date Guide
Use this companion guide beside the interactive calculator to make sure you understand the “why” behind every click. Each section includes the classroom explanation, student-friendly language, and quick practice prompts.
Before you start
Collect the data points listed below and double-check their units. Keeping an organized “givens” list is one of the fastest ways to reduce math errors and impress exam graders.
- pregnancy
- due date
- trimester
Detailed procedure
Step 1
Select the LMP date on the calendar input.
Step 2
Enter your average cycle length (default 28 days).
Step 3
Review the due date, weeks along as of today, trimester stage, and milestone dates.
Teaching & troubleshooting tips
Does this replace medical advice?
No. The calculator offers an educational estimate and should be validated with your healthcare provider.