Pregnancy Week Calculator
Find out exactly how far along you are and what's happening this week.
The standard starting point for gestational age.
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Find out exactly how many weeks pregnant you are by entering your last menstrual period or due date. Get your current trimester, days remaining until your due date, and a summary of where you are in your pregnancy journey — updated automatically each time you visit.
Frequently asked questions
How do I calculate how many weeks pregnant I am?
Count from the first day of your last menstrual period (LMP). The number of complete weeks that have passed since your LMP is your gestational age. Our calculator does this automatically when you enter your LMP or due date.
What trimester am I in?
The first trimester covers weeks 1–12, the second trimester is weeks 13–26, and the third trimester runs from week 27 to birth (week 40+). Enter your dates to see exactly which trimester you are in.
Can I calculate pregnancy weeks from my due date?
Yes. If you know your due date, enter it and the calculator will work backwards to tell you how many weeks pregnant you are today, and how many weeks remain.
Why does pregnancy count from the last period, not conception?
Pregnancy is dated from the first day of your last menstrual period because ovulation and conception dates are often unknown. Your LMP is a reliable reference point that healthcare providers can work from consistently.