Pregnancy Due Date Calculator
How Does the Pregnancy Due Date Calculator Work?
Our accurate Pregnancy Due Date Calculator uses Naegele’s Rule—the clinical gold standard used by obstetricians worldwide—adjusted for your specific menstrual cycle length.
By taking the first day of your last menstrual period (LMP) and adjusting for cycle variation, the tool calculates an estimated 40-week gestation timeline (280 days) to give you an accurate delivery date prediction.
Understanding Naegele’s Rule
In standard medical practice, a full-term pregnancy is estimated to last 280 days (40 weeks) from the first day of your LMP. While a standard cycle is assumed to be 28 days with ovulation occurring on day 14, our advanced calculator customizes the calculation based on your unique cycle length for greater precision.
What to Do After Finding Your Due Date
- Schedule Your First Prenatal Visit: Contact your healthcare provider or midwife to confirm your pregnancy and schedule an early ultrasound.
- Start Taking Prenatal Vitamins: Folic acid and essential prenatal nutrients support healthy early fetal development.
- Track Your Milestones: Pregnancy is divided into three trimesters (First: Weeks 1–12, Second: Weeks 13–27, Third: Weeks 28–40).
Disclaimer: This calculator provides an estimation based on clinical standards. Only a qualified medical professional using early ultrasound can provide a official medical due date.