Due Date Calculator - Calculate Your Pregnancy Due Date

What is an estimated due date during pregnancy?

Your due date (also known as your estimated due date) is a calculation of when you're expected to give birth. Your EDD is important for you to know as you prepare to welcome your baby.

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 EDD.

Our pregnancy Due Date Calculator (or estimated Due Date Calculator) can help. Here's how to calculate your due date using your last period, conception date, IVF transfer date, or timing of your last ultrasound.

First day of last period

Most 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).

Formula: Due Date = LMP + 280 days

You can also subtract three months from the first day of your last period and add seven days.

Formula: Due Date = LMP − 3 months + 7 days

The first day of your LMP is how most health care providers estimate a baby's due date.

Conception date

If you've been tracking ovulation symptoms or have been using ovulation test strips, you may be able to use your conception date to see how far along you are and when baby is likely to arrive.

Just add 266 days to get your estimated due date. Or select "conception date" in our calculator above and let it do the math for you.

IVF transfer date

If 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.

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