Free Pregnancy Due Date Calculator

If you don't know your exact LMP date, use the Conception Date method if you know approximately when you conceived, or the Ultrasound method if you've already had a dating scan. Early ultrasound scans (typically at 8–12 weeks) can measure the baby's size (Crown-Rump Length, or CRL) and calculate gestational age with greater precision than LMP-based methods - especially for women with irregular cycles.

For IVF pregnancies, the due date is calculated from the embryo transfer date, adjusted for the embryo's age at transfer. A Day-5 blastocyst transfer adds 261 days to the transfer date. A Day-3 cleavage-stage transfer adds 263 days. This is because the embryo is already 5 or 3 days old at transfer, so fewer days need to be added. IVF due dates are typically very accurate since the conception date is precisely known - unlike natural conception where ovulation timing can vary.

Pregnancy is divided into three trimesters: The First Trimester spans weeks 1–13 and covers fertilisation, implantation, and the formation of all major organs. The Second Trimester spans weeks 14–27, often called the golden trimester - nausea eases, energy returns, and the baby's movements become felt. The Third Trimester spans weeks 28–40, during which the baby gains most of its birth weight and the lungs mature in preparation for breathing outside the womb.

Week 24 marks the threshold of foetal viability - the point from which a baby has a chance of surviving outside the womb with intensive neonatal care. Babies born before 24 weeks have extremely limited survival chances. Between 24 and 28 weeks, survival is possible with specialist neonatal intensive care, though risks of complications are high. By 28 weeks, survival rates improve significantly. By 34 weeks, most babies do very well. This is why the 24-week milestone is medically significant and why it triggers important antenatal care reviews.

Key antenatal appointments include: First visit (week 8) - confirm pregnancy, blood group, haemoglobin, blood pressure. NT scan (weeks 11–13) - nuchal translucency screening for chromosomal conditions. Anomaly scan (weeks 18–20) - detailed anatomy check of all organs, gender can be confirmed. Glucose tolerance test (weeks 24–28) - screens for gestational diabetes. GBS swab (weeks 35–37) - checks for Group B Streptococcus. From week 36, check-ups typically become weekly. Our calculator automatically dates all these appointments from your LMP.

Under the Maternity Benefit (Amendment) Act 2017, working mothers in India are entitled to 26 weeks of paid maternity leave for their first two children, and 12 weeks for the third child onwards. This applies to all establishments with 10 or more employees. Up to 8 weeks of leave can be taken before the expected delivery date. Companies with 50 or more employees are also required to provide a creche facility. You can begin your maternity leave up to 8 weeks before your EDD - use this calculator to plan exactly when your leave should start.

This calculator provides general information for planning purposes only - it is not a substitute for professional medical advice. Due dates should always be confirmed with your obstetrician or gynaecologist, ideally with an early ultrasound scan. The actual EDD used for clinical purposes will be set by your doctor based on your full medical history, cycle regularity, and scan measurements. Please consult a qualified healthcare provider for all pregnancy-related medical decisions. The tool is intended to help you plan, track milestones, and understand your pregnancy journey - always alongside professional care.