Home
Back
EDD Wheel Calculation:
| From: | To: |
The EDD Wheel (Estimated Due Date Wheel) is a clinical tool used to calculate the estimated due date of pregnancy based on the last menstrual period. It follows the standard calculation of LMP + 280 days, representing a 40-week gestation period.
The calculator uses the standard pregnancy wheel calculation:
Where:
Explanation: This calculation assumes a regular 28-day menstrual cycle and ovulation occurring on day 14. The pregnancy wheel physically represents this calculation for quick clinical reference.
Details: Accurate EDD calculation is crucial for prenatal care scheduling, fetal growth monitoring, and determining gestational age for medical interventions and delivery planning.
Tips: Enter the first day of your last menstrual period in the date field. The calculator will automatically compute your estimated due date based on the standard 280-day gestation period.
Q1: How Accurate Is The EDD Wheel Calculation?
A: The EDD wheel provides a reliable estimate for women with regular 28-day cycles. Accuracy may vary with irregular cycles or uncertain LMP dates.
Q2: What If My Cycle Is Not 28 Days?
A: For cycles longer or shorter than 28 days, adjustments may be needed. Consult your healthcare provider for personalized calculation.
Q3: When Should Ultrasound Dating Be Used?
A: Early pregnancy ultrasound (first trimester) provides the most accurate dating and should be used when LMP is uncertain or cycles are irregular.
Q4: Can The Due Date Change During Pregnancy?
A: Yes, based on ultrasound measurements and clinical assessment, the due date may be adjusted, especially if early ultrasound dating differs significantly from LMP-based calculation.
Q5: What Percentage Of Babies Are Born On Their Due Date?
A: Only about 5% of babies are born exactly on their due date. Most births occur within two weeks before or after the estimated due date.