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.

402 thoughts on “How to Use Period Calculator

  1. JOYCE

    Good morning, my name is JOYCE, pls I want to what is happening to me,my last three month circle was,august 10th, sept 6th,oct 26th.and for this month, am yet to see it, could it be that am pregnant already? Because am filling some pains on my nipple but I did’nt know what it is, I don’t want to go for check up now because I don’t want to hear its negative..psl do reply me..

  2. JOYCE

    Hello,my name is Joyce, I sent you a request two days ago, please I need answers to my request because up till now am yet to see my period and I don’t know if I am pregnant already? The period calculator said my next period will come on the 22nd november according to the information that I provided, but today is 25th and I have not seen it,I fill pains on my nipple… Please I will be expecting to hear from you,thanks and God bless you…

  3. JOYCE

    Hello,it 5 days now and I hav’nt seen my period,please and please what could that be?

  4. Ujunwa

    pls i saw my period on Nov 23rd and supposed to see the next on 21st of Dec,
    and till now i have not seen it
    pls what could be the problem

  5. Kelly

    I saw my periods on 12th January and I had sex on second February, will I be pregnant?

    1. Ashley

      Nothing is completely guaranteed, I would definately try it but I would recommend getting some pregnancy tests 🙂 As long as you track your fertility, you shouldn’t have much an issue! Good Luck!

  6. Bridget

    Pls this February 13 was the first day of my period, please on March what would be the days. plus I need answer

  7. lourdemie

    Hi I have a normal menstruation but this month of march I missed my period. my last menstruation was Feb 4 2016. I took 3 times a pregnancy test, it’s negative

  8. gladys

    Please, my mentrual cycle is not regular,how can I calculate it with the period calculator

  9. Puleng

    Hi, I had my period on the 3rd March to 7th, we are trying for a baby with my partner. We had sex on the 13th and 16th ,on the 19th I saw very light blood,brownish blood and blood that has mucus when I wipe that last for 10 days.

    1. Bonnie

      That sounds like to me it’s implantation bleeding/mucus plug. I’d definitely take a test 2 days before your next period is do!!!

  10. Puleng

    Hi Bonnie
    I don’t know when is my period since last month I mens twice ,I took pregnancy tests twice and it was period was supposed to be on the 3rd or 4th still nothing.

  11. Darlene Torres

    Hi, I had my period twice in March. I’m not sure if I’m pregnant now because I think I am late. Do I count from the 1st period or the 2nd period from last month?
    I’m on the Pill

    1. Narda

      It’s not okay to have two periods in a month. This occurrence may be due to stress or other issues. You need to see your doctor to ensure that all is well. If you’re sure that it was an actual period, then you can count from the second period.

  12. Temu

    I have heavy flow and for a long time as in for seven days do you think it’s normal if not what to do

    1. Janet

      It is normal to have a regular period for 7 days but since your periods are heavy and lengthy, it is cause for concern. It’s best to discuss this type of bleeding with your doctor. Fibroids or other uterine issues may be the cause.

  13. Blessing Okeke

    Good day, please I had my period January 10,February 11th, March 12th and April 15th, I want to know if there is any problem with my period changing like this. I have been trying to conceive and in this month of MAY I saw a tiny drop of blood on the 9th and 10th, Please I need an answer help me thanks

    1. Emily Howdy

      Hello Blessing, irregular periods could be because of many reasons like hormonal imbalance, stress, anxiety, abnormal lifestyle etc.
      Spotting before period could be a sign of pregnancy, mostly it occurs few days after you have had sex. To check please take a pregnancy test to be assured.


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