The ovulation and menstrual cycle in general differs from one person to another. Due to this fact, there’s a constant need to figure out personal dates regarding the menstrual cycle and ovulation.

While a way out is to manually calculate the menstrual cycle length, ovulation, and fertile window regularly, another way is to make use of a tool that can be of assistance.

Try out the Ovulation Calculator Based on the Last 3 Periods, a tool that informs you on ovulation, your menstrual cycle length, and the fertile window within seconds.

*For information on the Ovulation Calculator Based on the Last 3 Periods, keep reading this post.*

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## What is the Ovulation Calculator Based on the Last 3 Periods?

The Ovulation Calculator Based on the Last 3 Periods is a simple yet informative tool that tracks your ovulation without the need for you to lift your finger. It makes use of your last three periods’ data to produce results on the ovulation you’ve been waiting for.

Even better, the ovulation calculator based on the last 3 periods gives insight not just into your ovulation, but also into your fertile window by estimating based on the average menstrual length and counting from the last period date you input.

This means the calculator does much more than producing dates. The fertile window result enables you to take possible steps if you are trying for a baby.

## How Does the Ovulation Calculator Based on the Last 3 Periods Predict Results?

Take a closer look at how the ovulation calculator based on the last 3 periods predicts your ovulation, average menstrual cycle length, and fertile window:

### 1. Determine the Average Cycle’s Length

In predicting, the first thing the calculator does is to determine your cycle’s average length. This is done by adding up the number of days in each of your last three menstrual cycles and then dividing that total by three. This average menstrual cycle length becomes the basis that the calculator uses for subsequent calculations.

Why is the average so important? Well, the length helps to adequately appropriate the times for the different phases in the menstrual cycle.

*If your cycle lasts above the normal length which is between 21 to 35 days, we advise you to see your doctor. *

### 2. Determine the Ovulation

The calculator operates on the ground that every woman ovulates 14 days before the beginning of her next menstrual cycle. Based on this ground, a 28-day menstrual cycle will ovulate on the 14th day of the cycle approximately, in the middle of the menstrual cycle. So, to estimate your ovulation date, the calculator subtracts 14 days from the day Aunt Flow should arrive next. This figure represents the beginning of the luteal phase, which is the time between the ovulation and the start of your next period if pregnancy does not occur.

### 3. Determine Fertile Window

Your fertile window is the period during which your chances of conceiving are at the highest. It’s the period you are most fertile. The calculator typically considers this window to be a few days before the ovulation and the day of your estimated ovulation itself. This is because the sperm can survive in a woman for several days waiting for the day ovulation (egg is released) takes place. So, engaging in sex during the days leading to ovulation can increase your chances of getting pregnant.

These three aspects are what the calculator does and looks into when producing answers. Now that you are aware of what the calculator relies on, see how you can use the calculator in the next section.

## How to Use the Ovulation Calculator Based on Last 3 Periods

**Step 1**

Enter the dates of your last three subsequent cycles. There are spaces provided for each so make sure you input them correctly. To make the process more easy for you, there’s a calendar available on each field you can use.

*Without this information, there’s no way you can get personalized results specifically for you. So if you haven’t recorded or taken note of when your period started for the last 3 months, you can jot down the next three menstrual period dates. Make sure to be as accurate as possible. You can also bookmark this page for when you need to come back. We’ll be expecting. *

**Step 2**

Enter the date of the first day of your last menstrual cycle in the space provided for the ovulation calculation.

**Step 3**

The calculator goes ahead and determines both your ovulation date and when your fertile window will be opened. It tells you the date and the days.

## When will I Ovulate If My Period Lasts 3 Days?

The number of days you menstruate does not play a role in determining when you will ovulate. Instead, it lets you know if your menstrual cycle is healthy or not. A 3 days bleeding is considered normal so there’s nothing to worry about.

However, what’s important in determining when you will ovulate is your average menstrual cycle length (we’ve explained how you can know that in one of the previous sections).

To figure out when you will ovulate using your average menstrual cycle length, (1) predict your next period based on your length, (2) subtract 14 days from that date.

Or you could simply make use of the ovulation calculator based on the last 3 periods available above.

## If my Period is Irregular can I Use the Ovulation Calculator Based on the Last 3 Periods?

Of course! Although having an irregular menstrual cycle can make tracking ovulation more challenging, it doesn’t mean you can’t use the ovulation calculator based on the last three periods.

The calculator is built to account for both regular and irregular menstrual cycles. That’s why it uses the last 3 periods. So, when you provide accurate data, the calculator will predict correctly.