Reverse Due Date Calculator

The reverse due date calculator will assist you whether you are already pregnant, wanting to conceive, or simply curious to learn when you were born and how old you are.

We’ll assist you with:

  • Using your birthday to calculate your conception date;
  • Plan your conception date so that you can have the due date you want.

Continue reading to learn about all the features of our reverse conception calculator (instructions included!).

However, the polar opposite of a due date calculator is a reverse due date calculator. When you know the date of your last menstrual period (LMP), you can use a due date calculator to estimate when your baby will arrive. When you know your due date but aren’t sure when you had sex or conceived the kid, a reverse due date calculator can help.

Using the Reverse due Date Calculator

You only need to enter one value into our reverse due date calculator. It could be The date of your birth; the date of your due date; the day of your conception; or the date of your intercourse.

Our reverse due date calculator will give you an estimate of when the intercourse most likely took place/should take place. Why is it an interval rather than a specific date?

Human fertility is a challenging topic that is influenced by several uncontrollable factors. To avoid any errors, we must constantly give ourselves some uncertainty range.

So, what could go wrong?

  • Each month, ovulation does not always occur on the same day; and
  • The calculated day of ovulation does not have to be the day of conception.

Reverse Due Date Calculator: Is It Possible To Determine The Exact Date Of Conception?

It’s a little more of a mystery for when conception takes place. It’s difficult to pinpoint the exact time of ovulation. Most women ovulate between days 11 and 21 of their monthly cycle, although as you can see, that’s a large span. Many women do not closely monitor cervical mucus and basal body temperature to determine ovulation, and even those who do can be off by a day or more.

To add to the confusion, conception can happen as soon as a few hours after intercourse or as late as a week! Is that even possible? Sperm can survive for up to a week within a woman’s body if the conditions are perfect.

We based most due dates on a woman’s previous menstrual period (LMP). That’s how it works with our due date calculator. The difficulty is that this method of estimating a due date isn’t always precise, especially for women who don’t have a 28-day cycle. It’s become the standard because most women are more likely to know their LMP date than their ovulation date.

If you’re presently pregnant, knowing when your pregnancy started is crucial at the conclusion of your pregnancy, when induction may come up. If your healthcare professional believes you’re further along than you are, you may be encouraged to try induction before you’re ready. This is when the reverse due date calculator comes into play.

Create A Pregnancy Calendar.

Is it feasible to plan your pregnancy? Yes, it is (to a decent extent)! We’ll walk you through utilizing all available resources to assist you to get the best potential results.

1. Date of Intercourse

Do you already know when you’ll ovulate? You can use a urine ovulation test or the temperature and cervical mucus approach detailed in our implantation bleeding calculator to confirm that ovulation occurred. You can also use our reverse conception calculator by entering your intended birth date. Intercourse must occur within 24 hours of ovulation in order to produce a baby.

2. 7 days after implantation

The embryo needs this period to travel between the fallopian tubes and the uterus, which is a long voyage. A simple, store-bought urine hCG test can be used a few days later to discover your pregnancy.

3. + 11/13 weeks for the first ultrasound

Now, because the baby is growing swiftly, we must double-check that everything is in order. Your doctor will measure the embryo’s CPR (length). After the 6th week of pregnancy, you will hear the baby’s heartbeat.

4. +18/22 weeks on the second ultrasound

The doctor will measure the baby’s abdomen and head circumferences, as well as his femur length, to rule out any anomalies. You might also want to double-check your pregnant weight increase!

5. 28/32 weeks on the third ultrasound

This is the ultimate assessment of the child’s well-being and developmental progress. If you haven’t already, this is the last chance to get all the tests required for a pregnant woman – the presence of viral infections, bacterial diseases, and diabetes during pregnancy – if you haven’t already done so.

6. + 280 days for delivery

To determine your estimated due date, use our due date calculator. We understand that not every child is born naturally, which is why we created an IVF delivery date calculator.


You can estimate when your kid was conceived by using a reverse due date calculator. If you have a regular 28-day menstrual cycle, this is especially true. During and after pregnancy, women go through a lot of physiological and psychological changes. It’s crucial to pay attention to your symptoms so that you can manage your stress during and after your pregnancy. Finally, make regular appointments with your doctor. It’s critical to maintain track of your pregnancy to safeguard the health of both you and your kid.

Our reverse due date calculator will assist you whether you are already pregnant, wanting to conceive, or simply curious to learn when you were born and how old you are. From the first day of your last menstrual period, pregnancy lasts an average of 280 days (40 weeks) (LMP). Even though you didn’t probably conceive until approximately two weeks later, we consider the first day of your LMP day one of pregnancy (fetal development lags two weeks behind your pregnancy dates). Here’s our roundup of the year’s greatest pregnancy application. It’s hardly an exact science figuring out your due date. While knowing when your baby will be born is crucial, don’t become too tied to the precise date.


How do you figure out when conception date?

A reverse due date calculator, like a due date calculator, will offer an estimated date of conception. A reverse due date calculator isn’t magic just it’s some straightforward math.
We expect pregnancy to be 280 days, or 40 weeks, from the last menstrual period and 266 days, or 38 weeks, from ovulation for a typical 28-day cycle. As a result, remove 266 days from your predicted due date to arrive at the most likely date of conception.

What Is My Due Date Based on date of conception?

Use that option in our due date calculator or our advanced due date calculator to achieve a more accurate predicted due date if you know when you conceived with relative confidence or have used our reverse due date calculator.

How far along in your pregnancy are you?

Pregnancy is thrilling, and it’s nice to understand as much as you can about that small individual growing inside of you using tools like the reverse due date calculator. Of course, the first thing our due date calculator tells you is your expected due date. The second thing it informs you is how far along you are in your pregnancy. If you scroll down the page, you’ll find a wealth of information on your baby’s development as well as what to expect as your body changes.

What Are the Benefits of Using a Reverse Due Date Calculator?

Perhaps your first prenatal appointment included a dating ultrasound that revealed your baby’s gestational age and due date.
1. You might want to know when to conceive if you want your kid to be born in September or later in the year.
2. Maybe you’re nostalgic and want to know when you or one of your children was born.
Whatever the situation may be, you’ve arrived at the perfect location. You can quickly do the arithmetic using our reverse due date calculator.
3. A reverse due date calculator calculates the approximate date of conception based on your predicted due date (or date of birth).
4. A reverse due date calculator will also tell you when the most likely time for intercourse was.

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