Pregnancy Calculator FAQ
How does this pregnancy calculator work?
It estimates pregnancy dates from one of three starting points: LMP, conception date, or due date. From that date, it calculates the estimated due date, current pregnancy week, and key timeline milestones.
How do I calculate my due date from LMP?
A common estimate is due date = LMP + 280 days, which is the same as 40 weeks. This calculator uses that standard approach when you choose the LMP option.
How do I find how many weeks pregnant I am?
Enter your LMP, conception date, or due date, then use the current or selected date in the pregnancy week section. The calculator will show completed weeks and additional days of pregnancy.
Can I calculate pregnancy from conception date?
Yes. If you know the conception date, choose that option and the calculator will estimate the due date and current pregnancy week from it.
Can I calculate backward from a due date?
Yes. Choose the due date option to estimate the corresponding pregnancy timeline in reverse, including the approximate LMP and current gestational age for the selected date.
How accurate is a pregnancy due date calculator?
It provides an estimate, not a diagnosis. Real pregnancy timing can differ because of cycle length, ovulation timing, implantation, and individual variation. Clinical dating is usually refined with ultrasound and medical advice.
What milestones does the calculator show?
It shows estimated dates for a pregnancy test, heartbeat, 2nd trimester, quickening, viability, and 3rd trimester. These are general timeline markers and may vary from person to person.
