Naegele's Rule calculation
Uses the medically established Naegele's Rule (LMP + 280 days) plus a cycle length correction for a personalized due date estimate.
Pregnancy Due Date Calculator
Calculate your expected delivery date, current week of pregnancy, trimester progress, and fetal milestones based on last period (LMP), conception, or IVF.
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How to use Pregnancy Due Date Calculator
- 1
Enter the first day of your last menstrual period (LMP).
- 2
Optionally adjust average cycle length if your cycle differs from the standard 28 days.
- 3
View your estimated due date (EDD), current gestational age, and key milestone dates.
- 4
See a trimester timeline to understand which stage of pregnancy you are in.
Why use this tool?
Full trimester timeline
Displays the dates for the end of each trimester, common screening appointment windows, and viability milestones.
Cycle length correction
Adjusts the due date for cycles longer or shorter than 28 days, giving a more accurate estimate than standard calculators.
Frequently asked questions
How accurate is the estimated due date?
The EDD is an estimate. Only about 4% of babies are born on their exact due date. Most births occur within two weeks before or after. An early ultrasound provides the most accurate gestational age and due date confirmation.
What is gestational age versus fetal age?
Gestational age (GA) is counted from the first day of your last menstrual period and is used by healthcare providers. Fetal age (conception age) is approximately 2 weeks less than gestational age.
Can I use this calculator if I had IVF?
For IVF pregnancies, due date is calculated from the egg retrieval date plus 266 days (for fresh transfers) or from the embryo transfer date plus 263 days (for 3-day transfers) or 261 days (for 5-day blastocyst transfers). Consult your fertility clinic for the precise method.
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