This is our Pregnancy Calculator
What is a pregnancy calculator? Gestational age, or the age of the baby, is calculated from the first day of the mother’s last menstrual period. Since the exact date of conception is almost never known, the first day of the last menstrual period is used to measure how old the baby is. Use our Pregnancy Calculator to calculate these dates for you.
So now that you understand the math behind your estimated due date, you can get out your calendar (and a calculator) and count 38 weeks from conception or 40 weeks from your LMP. Or to make it easier on yourself (and now that you’re pregnant, you’ll want to try anything and everything that’ll make things easier on you), you can use the calculator below instead (no counting…or adding necessary).
Note that this online program follows that system, too, so your first week of pregnancy is counted from your last menstrual period. That’s also why the program lasts 42 weeks; you’ll no doubt think of yourself as “overdue” by the time you reach that stage of pregnancy, but you’re not, really — it’s just that your baby hasn’t seen your schedule. (Or your estimated due date was off in the first place.) Of course, once you pass your due date, you won’t be the only one keeping a close eye on the calendar: Few practitioners will let their patients go more than 42 weeks into a pregnancy, not only because the uterus doesn’t stay hospitable forever, but because they don’t want that little baby head to become too big.
Tell your friends about this Pregnancy Calculator. They may need it one day.
If you want to find out if you are pregnant, you can also try our Free Online Pregnancy Probability Test
Of course, if you need a true, urine-based pregnancy test, please locate a true pregnancy center nearest you:
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