Pregnancy Due Date Calculator — Find Your Estimated Delivery Date
Determine your estimated delivery date (EDD), calculate your exact week of gestation, and track vital fetal developmental milestones throughout your pregnancy.
A standard, healthy human pregnancy lasts approximately **280 days (40 weeks)** from the first day of your Last Menstrual Period (LMP). Because the exact date of conception is incredibly difficult to pinpoint, obstetricians worldwide use standardized clinical math to forecast your timeline. Establishing an accurate **Estimated Delivery Date (EDD)** is the foundational step of prenatal care. It dictates exactly when you need crucial fetal anomaly scans, when gestational diabetes screenings must occur, and how your doctor will monitor fetal growth percentiles. Our Pregnancy Due Date Calculator utilizes Naegele's Rule (the medical standard), adjusted for your specific cycle length, to map out your entire journey from conception to your third trimester.
Pregnancy Settings
Awaiting Inputs
Please fill in your last period date and cycle details to estimate delivery and gestational milestones.
How to Use This Calculator
To estimate your baby's due date, you just need basic information about your menstrual cycle. Follow these steps:
- Select Calculation Method: You can calculate by the First Day of your Last Period (LMP), your exact Conception Date (if known via IVF/IUI), or an Ultrasound Date.
- Enter the Date: Use the calendar to select the precise date corresponding to your chosen method.
- Adjust Cycle Length (If using LMP): By default, the math assumes a 28-day cycle. If your normal cycle is shorter (e.g., 25 days) or longer (e.g., 35 days), adjust this number so the calculator can correct the ovulation offset.
- Calculate: The tool will output your EDD, current gestational age, and a timeline of your three trimesters.
What Your Result Means
Your results display your **Estimated Due Date** and break your pregnancy down into the three critical trimesters. Each phase demands different maternal nutrition and fetal monitoring:
First Trimester
Weeks 1 – 12The foundation of all major organs is established. Symptoms like morning sickness and fatigue are common due to rising hormonal levels. It is absolutely essential to start prenatal vitamins (especially Folic Acid) to prevent neural tube defects.
Second Trimester
Weeks 13 – 26Often referred to as the "golden trimester," maternal energy levels generally improve. A crucial anomaly scan (Level II ultrasound) is conducted during weeks 18–22 to clinically evaluate fetal anatomy and heart structures.
Third Trimester
Weeks 27 – 40+The baby grows rapidly in size and weight, preparing for delivery. Clinical checkups increase in frequency (often weekly) to monitor maternal blood pressure, fetal positioning (head down), and amniotic fluid levels.
When to See a Doctor
As soon as you receive a positive home pregnancy test, you should schedule your first prenatal appointment with an obstetrician (typically around Week 7 or 8 of your calculated timeline). During this visit, a dating ultrasound will be performed to measure the fetal Crown-Rump Length (CRL), which confirms fetal viability and locks in a medically accurate due date.
You must seek emergency medical attention immediately if you experience heavy vaginal bleeding, severe abdominal cramping, sudden swelling in your face or hands (a sign of preeclampsia), or a noticeable decrease in fetal movement during your third trimester. Prakash Hospital's Maternity and Obstetrics wing offers a 24/7 Level-III Neonatal Intensive Care Unit (NICU) and dedicated labor suites to handle both routine and high-risk deliveries.
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Consult Our Experts
Frequently Asked Questions (FAQs)
Can my pregnancy due date change?
Yes. If an early ultrasound scan (dating scan) estimates a delivery date that differs from your LMP-calculated date by more than 7 days, your obstetrician will likely adjust your due date to match the ultrasound measurements, as they are more accurate in early pregnancy.
What percentage of babies are born on their actual due date?
Only about 5% of babies are born exactly on their estimated due date. Most babies arrive between weeks 37 and 42 of pregnancy, which is considered a normal, full-term window.
How is the due date calculated if I have irregular cycles?
If your menstrual cycle length varies considerably (e.g., between 25 and 40 days), calculations based solely on the LMP can be inaccurate. In these cases, an early dating ultrasound is crucial to measure the embryo size and define your actual due date.
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