1. What is the Conception Date and Due Date Calculator?

This calculator estimates either the conception date based on a known due date, or the due date based on a known conception date using the standard 280-day pregnancy timeline.

2. How Does the Calculator Work?

The calculator uses the standard pregnancy duration:

Where:

• 280 days — Standard duration of human pregnancy (40 weeks)
• Conception Date — Typically 14 days after the first day of the last menstrual period (LMP) in a 28-day cycle

Explanation: The calculation accounts for the typical 280-day gestation period from conception to delivery.

3. Importance of Pregnancy Dating

Details: Accurate pregnancy dating is crucial for proper prenatal care, monitoring fetal development, and determining the optimal time for delivery.

4. Using the Calculator

Tips: Select whether you want to calculate conception date or due date, then enter the known date in the format YYYY-MM-DD.

5. Frequently Asked Questions (FAQ)

Q1: Is 280 days exact for all pregnancies?
A: No, this is an average. Normal pregnancies can range from 37 to 42 weeks.

Q2: How accurate is conception dating?
A: Conception dating is most accurate when based on early ultrasound measurements (first trimester).

Q3: What if I know my LMP but not conception date?
A: For regular 28-day cycles, conception typically occurs about 14 days after LMP.

Q4: Does this account for leap years?
A: Yes, the calculator properly accounts for leap years in the date calculations.

Q5: Why might my doctor's due date differ?
A: Doctors may adjust based on ultrasound measurements or other clinical factors.