The Gestational Age Calculator helps you determine exactly how far along you are in your pregnancy. Knowing your gestational age is important for:
- Scheduling prenatal tests and screenings at the right time
- Monitoring fetal development milestones
- Planning for delivery
- Understanding which trimester you’re in
How Gestational Age is Calculated
Gestational age is typically calculated from the first day of your last menstrual period (LMP), not from the date of conception. This is because most women know when their last period started, but ovulation and conception dates are harder to pinpoint.
Healthcare providers may also use ultrasound measurements to determine or confirm gestational age, especially in the first trimester when measurements are most accurate.
Understanding Your Results
Pregnancy is measured in weeks and days (e.g., “12 weeks and 3 days”). A full-term pregnancy is typically 40 weeks (280 days) from the first day of your LMP.