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Free calculatorPregnancy Week Calculator
Find out exactly how many weeks and days pregnant you are today, your trimester, and a link to your week-by-week guide.
Frequently asked questions
How do I know how many weeks pregnant I am?
Pregnancy weeks are counted from the first day of your last period (LMP), not from conception. Enter your LMP or due date above for your exact week and day.
Why does pregnancy start from my last period?
Gestational age is measured from the LMP because the exact conception date is rarely known. That is why you are already about 2 weeks pregnant at conception.
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Note: These calculators give estimates for general guidance only and are not a substitute for medical advice. Your doctor confirms your dates and due date by ultrasound.