How to Use Period Calculator

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Are you having problems determining the dates for your monthly period? If so, you should know that a period calculator will help you to estimate the date for your next menstruation. This calculator can give estimated details including the starting dates for your periods over the next twelve months or the next year.
You might be thinking that you don’t need to know your period date for every month, but imagine how this information will come in useful if you are actually planning to conceive. The calculator is very simple to use. You are only required to input the starting date for your last period, in addition the average length of your menstrual cycle.

Please select the first day of your last menstrual period:

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Usual number of days in your cycle:

A calendar can be used to keep a track of your monthly periods, so this is a good way to know the first and last days. As for the length of your average cycle or period cycle, this would be the time length in days, starting from Day 1 of a menstrual period and ending at Day 1 of the other. A normal menstruation period can take 2 to 7 days.

After entering the required information, the calculator will present the dates in no time without any hassles!

Menstrual Cycle

Most couples have a hard time when trying to conceive naturally, with some taking about one year. If you can relate to this, then you need to take time to understand menstrual cycle as well as the calendar for ovulation as this can improve your chances of conceiving. Knowing your menstrual cycle will help you to ascertain your ovulation days more accurately.

There are three phases in the menstrual cycle: the follicular, ovulation and luteal. The period for ovulation will be your most fertile time and this will occur about 10 to 12 hours after a LH surge. The length of your menstrual cycle is the number of days that the cycle lasts, which is different from the length of your period. The day when your period begins is cycle day; the beginning of a brand-new menstrual cycle.
On average, 28 days is the length for a woman’s menstrual cycle and the period length is 3 to 5 days. However, this is not the case for everyone as some have longer or shorter cycles which can vary monthly by a few days.
To calculate the length of your menstrual cycle, you can count the days from the first day of your period and go up to the day prior to the start of your next period. In turn, the average cycle length can be calculated by adding the length for each individual cycle and then divide by the overall number of cycles.


Ovulation occurs whenever the ovary releases a mature egg into your fallopian tube in preparation for fertilization. If you have been trying to conceive without success, then it is very important to understand your ovulation and menstrual cycle. Knowing this will help you to predict your most fertile days. An ovulation calendar is a proficient tool that can help you to ascertain your ovulating days.

With the help of an ovulation calendar, you can calculate the days when conception is most likely to occur. This calendar can be supported by an ovulation kit as it offers a great way for you to double check the high fertility days.
The ovulation calendar calculates the odds of conceiving by using a method that is based on the ovulation period as well as other factors such as the life expectancy of the egg and sperm. It will provide information that is even more accurate if you know the length of your menstrual cycle. A simple way to determine this is to track the number of days in your cycle, for around 3 to 4 months. You could have the regular 28 day cycle like most women, or it can vary between 29 and 32 days.

Calculating Due Date

When you get pregnant, you might be anxious to know your due date, just like every other expecting mom. In this case, a due date calculator will come in really handy. This tool will use the first day of the last period in order to calculate when you will give birth. It also uses the estimated time for your ovulation to determine when your baby will be born.

All you have to do is type in the exact date for the first day of the last menstrual cycle and the amount of days that your cycle normally runs. After that, you will receive an approximate date for the time when you will give birth. Note that the calculator will only give an approximate date based on the forty week calendar that is used for normal pregnancies. Furthermore, the result will be based on any data that you give. The predictions from these calculators are 80% accurate, so this is something that you need to keep mind. Of course, the real due date will still be dependent on the time when your baby is well good and ready to be born.

285 thoughts on “How to Use Period Calculator

  1. ramatu

    i had sex with my boyfriend during the fourth day of my menstruation
    I want to know if i can get pregnant

    1. Clepetark

      Hi, yes it is , some women have double ovulation so can get pregnant while during the period. I did …

      Good luck

    2. Clepetark

      Hi , yes it is possible there is no safe moment to have unprotected sex. Some women have multiple ovulation so can get pregnant at any time.

      Good luck

  2. Gemmalou

    myself & my partner have been trying regularly to fall pregnant. My period is due today, I haven’t started so I took a test and it came up negative. Given that my test kit said I could test up to 6 days before my period was due, is it possible that I could still be pregnant, or is that a definite no?

    1. Clepetark

      I think that for this turn … if you are already 6 days past to the earliest reactive test, you missed the boat. BUT the test takes 14 days after conception to trigger, track the last day you tried to conceive, if it is not 14 days past, test it again by then … nature is capricious sometime.

      Good luck

  3. ajay

    hi, my last period was on october 6 2014. i had unprotected sex on november 3 2014. will i get pregnant

  4. Aleen

    My last menstruation was on 9Th of Nov, 15Th October, 19Th Sep, 25Th August, 29Th July etc, every month my cycle length is getting different with 26, 27 or 28 days, and last long for 4 days or sometimes 3 days. Can anyone pls help me abt my ovulation date. We are trying for baby since last 1 Yr but Im not getting conceive can any one suggest me any specific position to conceive. I’m really desperate for a baby, pls help me

    1. Clepetark

      Hi , for irregular cycle it is still pretty simple. The day 1 if your period is the day 1 of your cycle, your fertile window is between day 10 and 17. During this period have intercourse only one day one 2, to allow more mature spermatozoids to be released. As they live 3 days in the womb, there will be always some up there to wait the ovulation to happen.

      Good luck and .. relax ! let the nature go !

  5. kaylah thompson

    Hi I had my period on the 24/10 so my next period was due yesterday and I didn’t get it but test is showing negative.

  6. Ama

    I had my menses on the 1st and had unprotected sex on the 10th can i get pregnant?

  7. kike

    My last period was 28th of November and I started having sex since 4th of December till 22nd of December,i want to know if am pregnant.

  8. Vivian

    hi I’m 23 married. His is service. We’ve been trying to get pregnant for a few months now. Last month I got my period dec 6-9. He came home the 19 last month. And ever since then we’ve been having sex. And I am bleeding now. My question is why I didn’t get pregnant?

    1. Clepetark

      hi , conceiving take some time, more for some, less for others. You have to concentrate yourself on your fertile window, which start 10 days after the day 1 of your period and end day 17, within this week you need to have intercourse one day on 2 … not everyday, to allow more mature spermatozoids to be released.

      Good Luck


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