Pregnancy Due Date Calculator

No. This is a planning estimate. Due dates are approximations, and only about 5% of babies arrive on the exact predicted date. Consult your healthcare provider for medical guidance.

First-trimester ultrasound dating is generally the most accurate. The LMP method is the standard starting point but can be off if cycles are irregular or the exact LMP date is uncertain.

Yes. Your healthcare provider may adjust your due date based on ultrasound measurements, especially if there is a significant difference from the LMP-based estimate.

For IVF pregnancies, the due date is calculated from the known transfer date minus the embryo age at transfer. A day-5 blastocyst transfer adds 261 days, and a day-3 embryo transfer adds 263 days. This is the most precise method because both dates are medically documented.

Naegele's rule estimates the due date by adding 280 days (40 weeks) to the first day of your last menstrual period. It assumes a 28-day cycle with ovulation on day 14. Your provider may adjust for longer or shorter cycles. This calculator is for planning purposes only and is not a substitute for medical advice.

The first trimester spans weeks 1 to 12, the second trimester covers weeks 13 to 27, and the third trimester runs from week 28 to 40. Each phase has distinct developmental milestones. Consult your healthcare provider for personalized prenatal care guidance.

Yes, the Pregnancy Due Date Calculator is fully embeddable. Tap "Embed" above to configure appearance and copy the code. It is free to use, works on any platform (HTML, WordPress, CMS), and adjusts to any screen size automatically. Visit calculory.com/services/embed-calculators for the complete guide.