Gestational Age Calculator

Gestational age is typically calculated using the formula: GA = Current Date − First Day of Last Menstrual Period (LMP). This method assumes ovulation occurred around day 14 of a 28-day cycle. The total days between the LMP and today’s date are divided by 7 to get gestational weeks. For example, if it’s been 84 days since your LMP, your gestational age would be 12 weeks.

Gestational age can be measured in two primary ways: 1) Menstrual dating, which is based on your LMP. 2) Ultrasound measurement, where the baby’s crown-rump length (CRL) or other fetal markers are used—especially useful if the LMP is unknown or cycles are irregular.

To calculate your gestation, count the number of days between the first day of your last menstrual period and today. Divide that number by 7 to convert to weeks. You can also use online tools or pregnancy wheels provided by healthcare professionals for more accuracy.

Gestational age using the Estimated Due Date (EDD) can be found by subtracting the number of days remaining until your due date from 280. Then, divide by 7 to get the number of weeks. Formula: GA = 40 weeks − (EDD − Today) If today is 200 days into the pregnancy, gestational age is 28 weeks and 4 days.

Normal gestational age ranges between 37 and 42 weeks. Delivery before 37 weeks is considered preterm, and beyond 42 weeks is termed post-term. Most pregnancies naturally conclude between 38 and 41 weeks.

Being 9 months pregnant generally corresponds to weeks 36 to 40 of pregnancy. Since months and weeks don’t align perfectly, the 9th month includes the final stretch leading up to labor.

A normal delivery typically occurs between 37 and 42 weeks of gestation. Full term is 39–40 weeks, which is when the baby is most likely to thrive outside the womb. Babies born before 37 weeks are considered preterm.

The 8th month of pregnancy usually begins at week 32 and continues until the end of week 35. It’s a crucial period as the baby’s lungs and brain continue to mature rapidly.

By the 9th month, the belly is generally at its largest size, with the uterus reaching up to the ribcage. Most women gain between 25–35 pounds during pregnancy, and the belly circumference may measure around 40 inches, depending on body type and baby’s position.

Yes, delivery can happen anytime during the 9th month. While most women deliver between 39 and 41 weeks, it’s not unusual for labor to begin earlier or later. Healthcare providers monitor closely during this phase to determine the best time for delivery.

The baby bump usually becomes visible between 12 and 16 weeks, especially in first-time pregnancies. In subsequent pregnancies, it may show earlier due to pre-stretched abdominal muscles.

The baby’s gender is often revealed during the anatomy scan at 18–22 weeks. However, some parents opt for earlier genetic testing (as early as 10 weeks) through blood tests like NIPT (non-invasive prenatal testing) to determine gender.