Calculate gestational age from your last menstrual period, due date, or ultrasound. Track your pregnancy progress and fetal development milestones.
First day of your last menstrual period
Gestational age is the age of the pregnancy calculated from the first day of your last menstrual period (LMP). It's typically about 2 weeks ahead of the actual conception date.
Ultrasound dating in the first trimester is the most accurate method. LMP dating assumes a 28-day cycle and ovulation on day 14, which may not be accurate for all women.
Healthcare providers may adjust due dates based on ultrasound measurements, especially if there's a significant difference from LMP dating. Always follow your doctor's recommended due date.
If you don't know your LMP date, use the ultrasound method if you have ultrasound results, or consult your healthcare provider for the most accurate dating method.