Pregnancy Calculator

days
Standard cycle is 28 days

Your Pregnancy Results

Due Date: -

Estimated delivery date

Gestational Age: -
Trimester: -
Conception Date: -
Conception 0% Due Date

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About Pregnancy Calculation

Pregnancy calculators help expectant mothers track their pregnancy journey by estimating due dates, gestational age, and important milestones. These calculations are based on established medical formulas and provide valuable information for planning and monitoring pregnancy progress.

How Pregnancy Due Dates Are Calculated

The standard method for calculating a pregnancy due date is Naegele's rule, which estimates the expected delivery date as 280 days (40 weeks) from the first day of the last menstrual period (LMP). This calculation assumes a 28-day menstrual cycle with ovulation occurring on day 14. For women with longer or shorter cycles, adjustments can be made for more accurate predictions.

Pregnancy Trimesters

Pregnancy is typically divided into three trimesters, each lasting approximately 13-14 weeks:

  • First Trimester (Weeks 1-12): Early development of all major organs and systems. Common symptoms include morning sickness, fatigue, and breast tenderness.
  • Second Trimester (Weeks 13-27): Often considered the most comfortable period. Baby's movements become noticeable, and gender may be determined via ultrasound.
  • Third Trimester (Weeks 28-40): Rapid growth and development as the baby prepares for birth. Symptoms may include back pain, difficulty sleeping, and frequent urination.

Key Pregnancy Milestones

Understanding fetal development milestones helps track your baby's growth:

  • Week 4: Implantation occurs as the embryo attaches to the uterine wall
  • Week 6-8: Heartbeat can be detected via ultrasound
  • Week 10-12: All essential organs have begun to form
  • Week 16-20: Baby's movements may be felt (quickening)
  • Week 20: Detailed anatomy scan typically performed
  • Week 24: Considered the point of viability
  • Week 37: Baby is considered early term
  • Week 39-40: Baby is considered full term

Factors Affecting Due Date Accuracy

Several factors can influence the accuracy of due date predictions:

  • Irregular Menstrual Cycles: Women with irregular cycles may have less predictable ovulation timing
  • First Pregnancy: First-time mothers often deliver later than their due date
  • Multiple Pregnancies: Twins and multiples typically deliver earlier
  • Medical History: Previous pregnancy complications may affect delivery timing
  • Maternal Age: Advanced maternal age may influence pregnancy duration

Important Prenatal Care Milestones

Regular prenatal care is essential for a healthy pregnancy:

  • First Appointment: Typically scheduled at 8-10 weeks to confirm pregnancy
  • First Trimester Screening: Ultrasound and blood tests at 11-14 weeks
  • Anatomy Scan: Detailed ultrasound at 18-22 weeks
  • Glucose Screening: Test for gestational diabetes at 24-28 weeks
  • Group B Strep Test: Screening at 35-37 weeks
  • Weekly Appointments: Begin at 36 weeks to monitor for labor signs