Gestational Age Calculator
Calculate your gestational age, due date, and track fetal development milestones. Based on your last menstrual period or ultrasound measurements.
Step 1: Pregnancy Information
Understanding Gestational Age
Gestational age is measured from the first day of your last menstrual period (LMP) to the current date. A typical pregnancy lasts about 40 weeks (280 days) from the LMP.
Step 2: Additional Information
About Pregnancy Trimesters
First trimester: Weeks 1-13, Second trimester: Weeks 14-27, Third trimester: Weeks 28-40+. Each trimester has distinct developmental milestones.
Pregnancy Calculation Results
Estimated Due Date
Pregnancy Timeline
Fetal Development Milestones
Gestational Age Formula
Due Date = LMP + 280 days (adjusted for cycle length)
Gestational age is calculated from the first day of your last menstrual period. The due date is estimated by adding 280 days (40 weeks) to the LMP, adjusted if your cycle is longer or shorter than 28 days.
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