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.


When did your last period start?


How many days did it last?


How long is your cycle?


Here are the results based on the information you provided.

Your next menstrual period is expected to start on

Your next most fertile period is from to

If you conceive within this timeframe, your estimated due date will be

Previous 2 MonthsNext 2 Months

  • Pre-Period
  • Period Days
  • Post-Period
  • Peak Ovulation

Please note that this is only an estimation of your menstrual 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.

424 thoughts on “How to Use Period Calculator

  1. Juliet

    Please i don’t know what to do i have long period which lasts for 9 days. please I want to know what is a problem.

  2. Laura Aigbe

    My name is Laura, I have a problem with my menstrual period For the past two years now since I stopped my baby from breastfeeding. My period has not been coming regular sometimes it lasts for a day or 2 days and is not Pure red.

    1. Millicent

      Ma’am, I think you should see a doctor and explain to him or her

  3. Amaka

    Am Amaka I had Abortion in April so pls when am I expecting to see my period again

  4. Mzz Hajj

    I want to know whether my menstrual cycle is 28 days or not.

  5. sulaimon

    Pls if water still comes out from breast can she get pregnant

  6. Harriet

    My name is Harriet I want to know the length of my Cycle because in every months it rises and fall or even do not come at all, I always suffer from abdominal pain I don’t know how to go about it.

    1. Sue

      Hi Harriet, the cycle changes you are getting may be because of hormonal imbalance, or some internal. problems. You should consult a doctor to diagnose your problem and give you a proper treatment. Regards.

    2. saddy

      I have a problem with my cycle because it’s now exactly 15 days and is back

  7. Tayo

    How can I stop my period on my wedding day? I discovered that my next menstrual period will start on my wedding day

  8. tina

    My name is Tina, I think my mentration is not regular. In june I saw it on june 1st to 3rd, in july I saw it on july 3rd and now I am seeing it a little on august 1st…. how do I calculate or what’s my menstrual cycle like. thanks

  9. lmeldanwogu

    I want to conceive again and I need a male child how do I go about it,I need your help.

  10. Jane

    Its been a year I got married but no miscarriage not talk of pregnancy and I have been meeting my husband on my ovulation day we have even gone to all possible tests but the results shows we are ok……. What else do I do to conceive?

    1. Sue

      Hi Jane, There are many causes from irregular ovulation to poor diet and nutrition, then might be blocking you from getting pregnant. You should consult a doctor to give you a proper treatment. Regards.

  11. Mr ND Mrs DOGO Balarabe

    I am a man who has been married for some time now. me and my wife have been trying to conceive but to no avail. My wife missed her circle for about six days and we thought she was pregnant but latter, it was not so. Menstrual cycle was very scanting. What do we do.

  12. luvlynk

    I love this alot it’s really teaching me most of the things I don’t know. Thx so much for this

  13. Sandra Ihiese Ugioro

    If water is coming out of the breast can she get pregnant


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