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Gestation Calculation:
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The Gestation Calculator Wheel estimates pregnancy duration and due date based on the last menstrual period (LMP). It follows the standard calculation of LMP + 280 days (40 weeks) to determine the estimated due date.
The calculator uses the standard gestation formula:
Where:
Explanation: The calculation assumes a regular 28-day menstrual cycle and ovulation occurring on day 14. Gestational age is calculated from the first day of the last menstrual period.
Details: Accurate gestational age calculation is crucial for monitoring fetal development, scheduling prenatal tests, determining appropriate delivery timing, and identifying potential pregnancy complications.
Tips: Enter the first day of your last menstrual period (LMP) in the date field. The calculator will provide current gestational age, estimated due date, and weeks remaining until delivery.
Q1: Why is pregnancy calculated from LMP instead of conception?
A: LMP is used because it's typically easier to recall than the exact conception date, and it provides a standardized method for healthcare providers.
Q2: How accurate is the 280-day calculation?
A: While 280 days is the average, only about 5% of women deliver exactly on their due date. Most deliver within 2 weeks before or after.
Q3: What if I have irregular periods?
A: For irregular periods, an early ultrasound (first trimester) provides the most accurate gestational age estimation.
Q4: Can this calculator be used for IVF pregnancies?
A: For IVF pregnancies, gestational age is calculated from embryo transfer date plus 14 days, not from LMP.
Q5: When should I confirm with a healthcare provider?
A: Always confirm pregnancy dating with a healthcare provider, who may adjust based on ultrasound measurements and clinical assessment.