Week 36 Calculator

To calculate the Date of Week 36, please enter the infant’s date of birth and gestational age in weeks and days above, and select “Calculate”

To calculate the Date of Week 36:

Identify the infant’s gestational age at birth in weeks (GA, weeks) and days (GA, days) from the 28 Day Form.

If the infant’s gestational age at birth is greater than or equal to 37 weeks, 0 days, the Date of Week 36 is not applicable.

If the infant’s gestational age at birth is from 36 weeks, 0 days to 36 weeks, 6 days, the Date of Week 36 is the infant’s date of birth.

If the infant’s gestational age at birth is 35 weeks, 6 days or less:

1. Subtract the infant’s gestational age at birth in weeks from 36 to calculate the number of weeks to Week 36.

2. Multiply the number of weeks by 7 and subtract the infant’s gestation age at birth in days to calculate the number of days to Week 36.

3. Add that number of days to the infant’s birth date.