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Pregnancy calculator

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The pregnancy calculator estimates the due date, conception date, and major milestones throughout pregnancy.

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Understanding your pregnancy timeline

A pregnancy calculator is a helpful tool that estimates important milestones during your pregnancy, such as your due date, fetal development stages, and trimester timelines. It is usually based on the first day of your last menstrual period (LMP), as this is a standard method used by healthcare providers.

How pregnancy is measured

Pregnancy is typically counted in weeks, starting from the first day of your LMP—even though conception usually occurs about two weeks later. A full-term pregnancy is around 40 weeks (or 280 days) from the LMP. This is divided into three trimesters:

  • First trimester (Weeks 1–13): Early development and major organ formation occur. Many women experience morning sickness, fatigue, and other early symptoms.
  • Second trimester (Weeks 14–26): Often called the “golden period,” many symptoms ease, and the baby’s movement becomes more noticeable.
  • Third trimester (Weeks 27–40): The baby continues to grow and prepare for birth. You may feel more physical discomfort as your body prepares for delivery.

Key pregnancy dates the calculator can help identify

  • Estimated due date (EDD): When your baby is most likely to be born.
  • Conception date: Estimated day of fertilization.
  • End of first and second trimesters: Useful for tracking prenatal screenings and developmental milestones.
  • Date of fetal heartbeat detection: Typically around week 6–8 via ultrasound.
  • Viability milestone: Around week 24–28, when the baby has a higher chance of survival outside the womb with medical support.

Important notes

  • These dates are estimates—only a small percentage of babies are born on their exact due date.
  • Your doctor may adjust your estimated due date based on an early ultrasound.
  • If you have irregular cycles, ovulated late, or used assisted reproductive technology, calculations may vary.

When to see a doctor

Once you know you’re pregnant, schedule an appointment with your healthcare provider. Early prenatal care is essential for monitoring the health of both mother and baby.