Home
Back
Pregnancy Calculation Formula:
| From: | To: |
The Pregnancy Calculator With Date Of Conception estimates the due date and current pregnancy duration based on the known conception date. It uses the standard calculation of adding 266 days (38 weeks) to the conception date to determine the estimated delivery date.
The calculator uses the pregnancy calculation formula:
Where:
Explanation: This calculation assumes a standard 38-week pregnancy from conception to delivery, which corresponds to 40 weeks from the last menstrual period (LMP).
Details: Accurate pregnancy dating is crucial for monitoring fetal development, scheduling prenatal care, preparing for delivery, and identifying any potential complications or preterm labor risks.
Tips: Enter the exact conception date if known. The calculator will provide the estimated due date and current pregnancy duration in weeks and days. For most accurate results, use conception date from fertility tracking or assisted reproduction.
Q1: Why 266 days instead of 280 days?
A: 280 days is calculated from the last menstrual period (LMP), while 266 days is from the actual conception date. Conception typically occurs about 14 days after LMP.
Q2: How accurate is this calculation?
A: When the exact conception date is known, this method is very accurate. However, only about 5% of babies are born exactly on their due date.
Q3: What if I don't know my conception date?
A: If conception date is unknown, use a calculator based on last menstrual period (LMP) or consult with your healthcare provider for dating ultrasound.
Q4: Does this work for IVF pregnancies?
A: Yes, this method is particularly accurate for IVF pregnancies where the conception date is precisely known.
Q5: Why might my actual due date differ?
A: Due dates are estimates. Factors like fetal development, maternal health, and normal biological variations can cause delivery to occur within a window of about 2 weeks before or after the calculated date.