Gestational Age Calculator
Weeks and days elapsed since LMP using the common 280-day-from-LMP framing. Early ultrasound may revise clinical dating when timelines diverge meaningfully.
Select your LMP date.
Important usage notes & limitations
Reproductive timelines interact with contraception cessation, PCOS phenotype, transgender hormone therapy intensity, low body-fat athletic amenorrhea, and perimenopause. Hormonal contraception intentionally suppresses natural ovulatory signals until washout stabilization — calendar methods become meaningful only once cycles resume reliably.
See also: Pregnancy Due Date Calculator · Women's health calculators hub.