Period Calculator for Pregnancy

Calculate when you can get pregnant based on your menstrual period.

Calculate your due date based on your last period.

Parenthood is an experience, and understanding the different phases of conception and pregnancy can help you feel more confident and prepared. In this article, we will introduce you to the Period Calculator for Pregnancy, which offers assistance in deciphering your fertile window and estimating your due date. While you might have a lot of questions regarding these aspects of pre and during pregnancy, this article aims to provide answers to them.  

Expect: The Period Calculator for Pregnancy (Fertile Window) and the Period Calculator for Pregnancy (Due Date)

What is the Period Calculator for Pregnancy? 

The period calculator for pregnancy is a tool capable of providing answers to your pregnancy questions. It tells you valuable information about your ovulation, fertility window, and your estimated due date.

 As a user-friendly tool, the period calculator for pregnancy keeps you informed if you are trying to conceive and provides awareness regarding your estimated due date. 

To assist you with these facts, the period calculator for pregnancy is made up of two calculators; the period calculator for pregnancy (fertile window) and the period calculator for pregnancy (due date). Let’s take a look. 

The Two Parts of the Period Calculator for Pregnancy

As previously mentioned, the two essential parts that make up the calculator are the period calculator for pregnancy (fertile window) and the period calculator for pregnancy (due date). Each component plays a significant role in providing assuring information to you on your way to parenthood. Curious? Find out what they can do. 

The Period Calculator for Pregnancy (Fertile Window)

The period calculator for pregnancy (fertile window)  also referred to as the fertile window calculator is the first part of the period calculator for pregnancy. This calculator focuses on discovering your ovulation and fertile window days within your menstrual cycle. 

The calculator presents you with a series of days and their specific dates using the information you will provide. This information surrounds your period date and the length of your menstrual cycle.  

Ridiculously simple to use, you can be rest assured to navigate through it easily. 

The Period Calculator for Pregnancy (Due Date)

Also known as the due date calculator, the period calculator for pregnancy (due date) is the second part of the calculator. While the first component of the calculator focuses on helping you discover the days you are likely to get pregnant (your fertile window), the due date discovers another. 

Once you have received the wonderful news of pregnancy, you might be curious to know the estimated date of delivery (EDD). It’s only natural for an expectant mother to want to know when her baby arrives. This due date calculator does just that for you. It satisfies your curiosity. 

This means it comes into play after conception. 

Likewise, the due date calculator informs you when your baby is to arrive irrespective of the nature of your menstrual cycle. It takes note of the variables and presents you with options that suit your menstrual cycle. 

The Necessary Formulas the ‘Period Calculator for Pregnancy’ Uses

Behind the period calculator for pregnancy lies a series of essential formulas and calculations that make it a reliable and accurate tool. 

It’s best to take a look at the formulas employed as they can provide insights into how the calculator works. 

As you know, the period calculator for pregnancy has 2 calculators that help answer your pregnancy questions. Let’s explore the necessary formulas used by each: 

For The Period Calculator for Pregnancy (Fertile Window)

This calculator determines your fertile window and ovulation based on your menstrual period date. While it is known that a 28-day menstrual cycle’s ovulation occurs on the 14th day before the next menstrual cycle, calculating the fertile window for an irregular menstrual cycle might seem difficult. 

However, according to Today’s Parent, every woman ovulates 14 days before the next period. So, no matter the length of your cycle, you will ovulate 14 days before. 

For The Period Calculator for Pregnancy (Due Date)

Once you’ve conceived, the due date calculator can estimate your baby’s due date. The estimation is based on two grounds. First, the date of your last menstrual period (LMP) and the length of your menstrual cycle. Due to the variations in the length of the menstrual cycle, the calculator uses two theories in predicting your due date.  

1. Last menstrual period
2. Parikh’s formula. 

While both formulas are known to use your LMP, one is based on a 28-day menstrual cycle length, and the other can account for irregular cycles as well. With this, you can choose the most appropriate option that can appropriately estimate the due date based on your menstrual cycle. 

The use of the last menstrual period assumes that:

1. You have a 28-day menstrual cycle. 
2.  A standard pregnancy duration of 280 days (40 weeks), which is an average for most pregnancies. 

Here’s how the calculation is done: Estimated due date= LMP- 3 months + 7 days + a year 

Let’s give an instance. If your LMP is May 23, 2023, following this formula you will get your due date by calculating: May 23, 2023 – 3 months + 7 days + a year which will result in February 27, 2024. 

On the other hand, Parikh’s formula does not assume the length of your menstrual cycle. Instead, it allows you to choose the length and goes further to do the calculation. 

Here’s what the formula looks like- Estimated due date= LMP + 9 months – 21 days + length of cycle. 

This means that Parikh’s formula assumes that:

1. Pregnancies last for 9 months
2. Not everyone has an average menstrual cycle length of 28 days. 

Let’s take a look at a sample: Your LMP was June 29, 2023, and your last menstrual cycle length was 25 days.  

Then, June 29, 2023+ 9 months – 21 days + 25 days.  In this case, it equals the 4th of March, 2024. 

All these are the basis the calculator uses in providing accurate results for you. Now, take a look at how the calculator works.  

How Does the Period Calculator for Pregnancy Work? 

Knowing the calculator can present both results on your fertile window and due date, let’s explore how this remarkable tool works, covering both of its crucial parts – the Fertile Window Calculator and the Due Date Calculator.

How does the Fertile Window Calculator work: 

Step 1

To begin using the Fertile Window Calculator, you will need to input specific information about your menstrual cycle. The required inputs typically include the date of your last menstrual period (LMP) and the average length of your menstrual cycle.

Step 2

The calculator pinpoints your ovulation date in this format; month, day, and year. It goes further to specify your fertile window, giving you a series of dates. 

How does the Due Date Calculator work: 

To use the due date calculator, you need to select the method you prefer; the LMP method or Parikh’s formula. 

Using the LMP Method: 

Step 1 

Either use the calendar to select the date of your last LMP or input it manually in the field provided. 

Step 2

The calculator informs you of your conception date and the likely date to expect your baby. 

Using Parikh’s Formula:

Step 1

Input the date of your last LMP.

Step 2

Select the duration of your previous cycle by using the – and + bar or entering it manually. 

Step 3

The calculator tells you your estimated due date. 

At this point, we’re glad you have your results with you. 

FAQs

1. How do I calculate my period to get pregnant?

Calculating your period to increase your chances of getting pregnant involves understanding your menstrual cycle and identifying your fertile window – the days when conception is most likely to occur. 

You can make use of the fertile window calculator above to predict when you are likely to get pregnant. 

The key things to note:

• The fertile window is the 5 days leading to ovulation plus the day of ovulation.
• The end date is the actual day of ovulation.
• Sperm can survive for about 5 days. So if you have sex 5 days before ovulation you can get pregnant.

2. Can you get pregnant a week after your period?

Yes, it is possible to get pregnant a week after your period, although the likelihood may be lower compared to your fertile window. 

Some women have shorter menstrual cycles, which means they may ovulate earlier in their cycle, potentially making them fertile soon after their period.

3. When is the highest time to get pregnant after a period?

The highest time to get pregnant after your period is during your fertile window, which typically occurs around the time of ovulation. For women with regular 28-day menstrual cycles, ovulation usually happens around day 14 of the cycle, with day 1 being the first day of your period.

Since not all women have 28-day cycles, ovulation varies from person to person. To determine your specific fertile window, use the Period Calculator for Pregnancy (fertile window) which considers the length of your menstrual cycle. 

Find Out More From Your Doctor

It’s essential to consult your doctor regarding any further or personalized guidance regarding your fertility and due date. We wish you a smooth journey during pregnancy. Good luck!