1. What is the Gestation Calculator Wheel?

The Gestation Calculator Wheel estimates pregnancy due date using the standard calculation of 280 days (40 weeks) from the first day of the last menstrual period (LMP). This is the traditional method used by healthcare providers.

2. How Does the Calculator Work?

The calculator uses the simple formula:

Where:

• Last Menstrual Period — First day of the woman's last menstrual period
• 280 days — Standard length of human gestation (40 weeks)

Explanation: This calculation assumes a regular 28-day menstrual cycle with ovulation occurring on day 14.

3. Importance of Due Date Calculation

Details: Accurate due date estimation is crucial for proper prenatal care, monitoring fetal development, and planning for delivery.

4. Using the Calculator

Tips: Enter the first day of your last menstrual period in the format YYYY-MM-DD. The calculator will add 280 days to this date to estimate your due date.

5. Frequently Asked Questions (FAQ)

Q1: How accurate is this calculation?
A: It's accurate for women with regular 28-day cycles. For irregular cycles, ultrasound dating may be more accurate.

Q2: What if I don't know my LMP?
A: An early pregnancy ultrasound can provide an estimated due date based on fetal measurements.

Q3: Why 280 days?
A: This represents 40 weeks from LMP (about 38 weeks from conception), the average length of human pregnancy.

Q4: What percentage of babies are born on their due date?
A: Only about 5% of women deliver on their exact due date. Most deliver within 2 weeks before or after.

Q5: Does this work for IVF pregnancies?
A: For IVF, the conception date is known precisely, so due date is calculated as 266 days (38 weeks) from conception.