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When is your baby due? Use this pregnancy calculator to find your due date based on the date of your last menstrual period, conception date, IVF three-day or five-day transfer date, or date of your last ultrasound. The first day of your last period IVF 3 Day Transfer Date IVF 5 Day Transfer Date
First day of last periodMost pregnancies last around 40 weeks (or 38 weeks from conception), so typically the best way to estimate your due date is to count 40 weeks, or 280 days, from the first day of your last menstrual period (LMP). You could also subtract three months from the first day of your last period and add seven days. The first day of your LMP is how most health care providers estimate a baby's due date. But remember, it's only an estimated due date, not a deadline for your baby to arrive. Just 4 percent of babies are born on their estimated due date. Conception dateIf you've been tracking ovulation symptoms or have been using ovulation test strips, then you may be able to use your conception date to calculate your pregnancy due date. Just add 266 days to get your estimated due date (or select "Conception Date" from the menu above, and let our Due Date Calculator do the math for you). IVF transfer dateIf you conceived through in vitro fertilization (IVF), you can calculate your due date using your IVF transfer date. Most embryo transfers occur either three days or five days after egg retrieval and fertilization. If you had a day-three transfer, count 263 days from the transfer date to calculate your due date, and if you had a day-five transfer, count 261 days. (Or select "IVF" from the menu above.) Ultrasound scanEven if you can’t pinpoint when you conceived, forget the day of your last menstrual period or aren’t sure when ovulation occurred, other clues can help you and your practitioner determine your due date at your first prenatal appointment, including:
Can I plan my due date?Whether you're trying to avoid being very pregnant in the middle of summer or are a teacher who wants to maximize time off with your little one, you can try to time when you conceive in order to "plan" your due date. But even if you're one of the lucky ones who's able to get pregnant when she really wants to, just remember that you probably won't be able to map out exactly when you'll give birth to the day (or even the week or month!). Still, you can try our Ovulation Calculator, which uses the date of your last menstrual period and your typical cycle length to discover the days you're most likely to be fertile and increase your chances of conceiving. Can my due date change?Yes, your due date can change. While it’s definitely not a reason to worry, your doctor may change your due date for a number of reasons as your pregnancy progresses. It may be that you have irregular periods and your early ultrasound dating was off, or that your first ultrasound was in the second trimester. It could also be because your fundal height is abnormal, or your levels of alpha-fetoprotein (AFP), a protein made by the baby, are outside the usual range. Talk to your practitioner if you have any questions or concerns.
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When did I conceive based on my due date?For a regular 28-day cycle, pregnancy is estimated to be 280 days, or 40 weeks, from your last menstrual period, and 266 days, or 38 weeks, from the date of ovulation. Therefore, to calculate the most likely date of conception, you need to subtract 266 days from your estimated due date.
How can I find out the exact date I conceived?The simplest way to estimate your conception date is to count forward approximately two weeks from the start of your last menstrual period. Most women ovulate two weeks after their period ends, and ovulation is when you are most fertile and most likely to become pregnant.
Can you tell the exact date a baby was conceived?Knowing the exact day of conception is a difficult thing. Sperm can live in a woman's body for up to five days, making it impossible to calculate exactly when conception occurred. It is not a fine science. In addition, women ovulate anywhere from 11 to 21 days after the first day of their last period.
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