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Pregnancy Due Date Calculator | BabyCenter

Calculation method

When did your last period start?

mm-dd-yyyy

Cycle length

BabyCenter's Due Date Calculator

Use our pregnancy due date calculator by plugging in either the date of your last menstrual cycle or the date you know you conceived. The calculator will do the rest.

How is my due date calculated?

There are several ways your due date is determined. If you happen to know the day you conceived, you can count 38 weeks from that day to find your due date. (Human gestation takes about 38 weeks.)

But very few expectant moms know exactly when they conceived. Even if you only had sex once during your fertile period, you wouldn't conceive on that day unless you happen to be ovulating. Sperm can live for up to five days inside your fallopian tubes. So, it could be up to five days after you have sex that you release an egg (ovulate) and it gets fertilized by a waiting sperm. That's the day you conceive.

So, without knowing the day of conception, how does anyone determine a due date?

First day of your last period

The most common way to calculate your pregnancy due date is by counting 40 weeks from the first day of your last menstrual period (LMP). And that's how most healthcare providers do it.

If your menstrual cycle length is the average length (28-day cycle), your menstrual cycle probably started about two weeks before you conceived. This explains why pregnancies are said to last 40 weeks instead of 38 weeks.

This method doesn't take into account how long your menstrual cycle actually is or when you think you might have conceived. But generally speaking, women typically ovulate about two weeks after their menstrual cycle starts. And women are more likely to know when their last period started than the day they ovulated.

Conception date

If you do happen to know precisely when you conceived – say, if you were using an ovulation predictor kit or tracking your ovulation symptoms – you can calculate your pregnancy due date based on your conception date. Just choose that calculation method from the pulldown above and put in your date.

Note: Again, you don't necessarily conceive on the day you have sex.

IVF transfer date

If you conceived through IVF, you can calculate your due date using your IVF transfer date. If you had a Day 5 embryo transfer, count 261 days from your transfer date. If you had a Day 3 embryo transfer, count 263 days.

Can my due date change?

Your healthcare provider might revise your due date if your baby is measured during a first trimester ultrasound scan and found to be much bigger or smaller than expected for gestational age. This is more likely to happen if you have an irregular menstrual cycle length that makes it hard to pinpoint the date of conception.

Your healthcare provider will measure your baby during that ultrasound exam to figure out how far along your baby is and then provide you with a new due date.

What if I already know my due date?

If you already know your due date, you can use this calculator to see your pregnancy timeline. It will tell you when you'll hit various milestones, and when you may be due for prenatal tests and prenatal visits. You'll also find what your baby's sign and birthstone will probably be and which famous people were born on your due date.

How likely am I to give birth on my due date?

Of course, a due date calculation is always approximate, whether it's from our tool or from your doctor or midwife. Only 1 in 20 women delivers on her due date. You're just as likely to go into labor any day during the two weeks before or after.

Want more information about how the weeks, months, and trimesters of pregnancy are counted? See our pregnancy timing chart.

How soon can I take a pregnancy test?

With all this talk about pregnancy due dates, you may be wondering when you can take a pregnancy test. To ensure you get the most accurate reading, it's best to wait a few days after your missed period to take a pregnancy test.

At-home urine tests measure the amount of hCG (human chorionic gonadotropin) present in your body. If you take a pregnancy test before you miss your period, you may not get an accurate result, despite what some tests advertise.

If you're getting a blood test in your provider's office, you may get results sooner. These tests also measure the amount of hCG in your bloodstream, but they're more sensitive than at-home urine tests. Blood tests may be able to detect pregnancy six to eight days after ovulation.

Read more:

Your pregnancy, week by week
Your first trimester pregnancy checklist
Pregnancy Weight Gain Calculator
Ovulation Calculator
See all tools

BabyCenter Staff

Content that appears under this byline was created by members of the BabyCenter Editorial team.

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Online date calculator

The calculator can be used to find a date that is the specified number of days or the difference in days between two dates .

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will be shown here

Service manual

If you check the item Monthly layout , then the number of days in each month until the required date will be shown in a convenient form.
Example. Determine the exact number of days between two dates: 02/14/2019 and 08/27/2019.
Number of days between dates: 194
February 2019, 14 days: from 02/15/2019 to 02/28/2019
March 2019, 31 days: from 03/01/2019 to 03/31/2019
April 2019, 30 days: from 04/01/2019 to 04/30/2019
May 2019, 31 days: from 05/01/2019 to 05/31/2019
June 2019, 30 days: from 06/01/2019 to 06/30/2019
July 2019, 31 days: from 07/01/2019 to 07/31/2019
August 2019, 27 days: from 08/01/2019 to 08/27/2019
Total: 14 + 31 + 30 + 31 + 30 + 31 + 27 = 194

According to scheme 360 the number of days per year is assumed to be 360 (each month has 30 days).
Example. Determine the approximate number of days between 02/12/2019 and 08/27/2020.
If the year is considered as a span containing 12 months of 30 days (the divisor is 360 days), then the approximate number of days is calculated as follows:
n = 360*(y2-y1)+30*(m2-m1)+(d2-d1)
where y is the number of the year, m is the number of the month in the year, d is the number of the day in the month.
n = 360*(2020-2019)+30*(8-2)+(27-12) = 555 days

First and last day in the contract

First day

The loan agreement is considered concluded from the moment the money is transferred, but this day does not need to be taken into account for the purposes of calculating interest.
For example, "since 02/07/2019" means that days are counted from "02/08/2019". For example, the number of days "from 02/07/2019" to "02/08/2019" is 1 ("02/08/2019").