Pregnancy Calculator: Calculate Gestational Age & Fetal Development

Monitor your pregnancy week by week. Calculate your estimated due date (EDD) and learn about your baby's development stages in the womb.

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Fill in the required parameters on the left and click calculate to see the detailed results and analysis.

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Welcoming Your Little One with Careful Planning

Pregnancy is an extraordinary journey of approximately 40 weeks (9 months and 10 days). Knowing your gestational age accurately is very important for monitoring fetal growth and preparing for all delivery needs. Our Pregnancy Calculator helps you determine your estimated birth date, often called the Estimated Due Date (EDD), based on the first day of your last period.

How to Calculate Gestational Age

In the medical world, gestational age is calculated from the First Day of the Last Menstrual Period (LMP), not from the time of conception. This is because it is difficult to determine the exact time of conception, while the LMP is a more memorable benchmark for mothers.

  • •Naegele's Rule: The standard formula used by midwives and doctors to calculate the due date is (LMP Date + 7 days), (LMP Month - 3 months), (LMP Year + 1 year).

    • The Importance of Knowing Pregnancy Trimesters

    Pregnancy is divided into three main stages, each with unique characteristics:

  • 1First Trimester (Weeks 1-12): The period of vital fetal organ formation. Mothers often experience morning sickness due to hormonal changes.
  • 2Second Trimester (Weeks 13-27): The fetus begins moving actively and the mother's bump starts to show. Often called the most comfortable period of pregnancy.
  • 3Third Trimester (Weeks 28-40): The final preparation stage. The fetus grows very quickly and the mother may feel tired more easily.

    • Routine Monitoring (Prenatal Care)

    Health organizations globaly recommend that pregnant mothers perform routine checks at least 6-8 times during pregnancy. These checks include:

  • •Weight weighing and blood pressure measurement.
  • •Fetal heart rate monitoring through Ultrasound (USG).
  • •Laboratory tests for blood and urine checks.
  • •Provision of iron supplements and necessary immunizations.

    • Signs of a Healthy Pregnancy

    Several indicators that your pregnancy is going well include:

  • •Consistent growth of the abdomen circumference according to gestational age.
  • •Active fetal movement (starts to be felt at 18-20 weeks).
  • •Absence of heavy bleeding or severe abdominal pain.
  • •Maintained appetite and controlled maternal weight gain.

    • Learn About Fetal Development

    Use the results from this calculator to read information about your baby's development by week. You will know when the baby starts to hear sounds, when their heart starts beating, until when the baby is in a position ready to be born.

    ? Frequently Asked Questions

    Q How accurate is the Estimated Due Date (EDD)?

    The EDD is only an estimate. Only about 5% of babies are born exactly on their due date. Most babies are born within a two-week window before or after that estimated date.

    Q What is the LMP (Last Menstrual Period)?

    The LMP is the first day your menstrual bleeding started in the last cycle before you were declared pregnant. This figure is the basis for calculating the medical age of the fetus.

    Q What if my menstrual cycle is irregular?

    If your menstrual cycle is irregular, manual calculations via LMP may be less accurate. The best way is to have an Ultrasound (USG) check in the first trimester to determine the fetal age with more precision.

    Q Is it safe to exercise while pregnant?

    Generally safe and highly recommended to perform light exercise such as walking or prenatal yoga, provided there are no medical complications and you have consulted your obstetrician.

    Q When should I see a doctor immediately?

    Contact medical personnel immediately if you experience bleeding, very severe abdominal pain, premature leakage of amniotic fluid, or if you feel fetal movement has drastically decreased.