Menstrual cycle     Ovulation kits     Ovulation signs     Pregnancy


Using a Menstrual Cycle Calculator

Please select the first day of your last menstrual period:

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Usual number of days in your cycle:

If you want to stand the best chance of getting pregnant, then you need to know when you are ovulating. This is the time of the month that you are at your most fertile, and thus stand a greater chance of a sperm reaching the egg and fertilizing it. One of the biggest problems people have however is knowing how to calculate their menstrual cycle. This is where technology can come in useful. You can use items such as a menstrual cycle calculator which should provide you with a rough estimate about when you are next going to ovulate. Let me tell you a little about how these work.

Menstrual Cycle Calculators vary in complexity, some will ask you for information such as your average body temperature, as well as various other bits and pieces about what your body is currently going through. These types of cycle calculators often give the most accurate results, but many people find that they are ‘over kill’, and the majority of the information that they ask for is not something that people will have to hand readily, especially months of data about the subject. Therefore many women use simpler menstrual cycle calculators, which still give fairly accurate results.

The first thing that the menstrual cycle calculator will ask you is the date of your last period. Hopefully this should be information that almost any woman should be able to answer fairly easily. This will be the starting date of the last period and not the ending date.

The next piece of information that you will be asked for is the average length of time between your periods. This is the ‘length of the menstrual cycle’. Of course, the human body does vary wildly here, and whilst some months there could be 30 days between your period, and others it could be as low as 25. However, you are only after an average here. Do try to be as accurate as possible though as this will affect the results that you are given, and this of course will have a profound effect on what the calculator tells you is the ideal time to try for a child.

Finally you will be given your results. Generally you will be told the date of your next period, which should be fairly accurate. What you are going to be most concerned with however is the next ovulation period. This will be the time that you are at your most fertile and therefore stand the best chance of getting pregnant. What you do need to remember though is that the information isn’t 100% accurate as it is impossible to predict the human body, so ideally you would want to start having sex a couple of days before this, and a couple of days after.

Whilst they aren’t 100% accurate, the menstrual calculator is still a useful tool. It provides a ‘free’ way of knowing when you stand the best chance of getting pregnant, and this of course can be a god send for a couple who are struggling with this.

Learn more about Menstrual Cycle and how to to calculate it manually.

196 Responses to “”

  1. Sheena says:

    I had my period Oct 1 2014 it end on the 5th of oct. I had sex on Oct 11 and 12. My boyfriend did release inside of me and he went deep, could I be pregnant?

  2. bhavna says:

    my last menstrual cycle started on 6 sep and i have irregular periods sometimes it comes in 2 months or sometimes in 35- 40 days and i had sex on 22 sep can i be pregnant..

    • Clepetark says:


      where there is unprotected sex, there is always a risk to be pregnant. Risk are minimal but existing. Many factors have to align himself to . To avoid unnecessary stress as you have an irregular cycle to you test yourself with a pee on the stick test 14 days after the not protected sex, it is the time required to built enough HCG hormones in your body to trigger the test. Use the first morning urine as this one is the most concentrated in HCG

      Good luck

  3. Anne says:

    How many day of being late should you take a pregnancy test?

    • Clepetark says:

      Hi , some test are sensitive enough to trigger a positive 2 days prior your due date. Most of the the day you are due. I recommend you to wait to be late 2 days before testing yourself as you could trigger a false negative in case you conceive at the end of your fertility window

      Good luck

  4. Happiness says:

    Pls i need to know if i can get pregnant because i had an unprotected sex 3days out of my 5days ovulation periods but my bf did not release in me

  5. Mawiyah Bomani says:

    I am 42 and I had my last period on august 27 and it lasted until September 5. I did not have a period in September. My prior july period was on the 13th and lasted until the 18th of that month. What can be going on?

    • clepetark says:

      Hi , having one weird cycle is normal, we have changes in our lives, so the cycle too ! If it keeps being irregular and random don’t hesitate to speak about it with your physician, he/she will investigate the reason and propose you solutions.

      Good luck !

  6. edna says:

    My circle is 28 days but this month I got my period on 1st of October it was supposed to come on 28th of September so my problem is when am I ovulating this month,,,am TTC

    • clepetark says:

      Hi , your ovulation will occur between the day 10 to 14 of your cycle, the day one being the first day of your period. You can always track it more precisely by taking your temperature every morning before getting out of bed and add it to your calendar, you will see the temperature will increase starting 2 days before the most fertile day

      Good luck !

  7. Nabihah says:

    I check the menstrual Calculator, my first day of my last period Is on 1 sep 2014, the calculator shows that I will get on the 29 sep 14. but till now I still haven got my period

  8. Shay says:

    Ok so my last period was either Aug 29,30 or 31 I’m really not sure, now my guy and i had unprotected sex on the 4,9 and 16 of Sept and each time he ejaculated inside of me. Now from the menstrual calculators I’ve been using it says my period should have started Sep 26 but it hasn’t, could i be pregnant?

    • Ana Maria says:

      I totally understand you. I’m in the same situation. I can’t remember the exact day when my menstrual period started. I had unprotected sex on Sep. 13 and on the 19th. Not sure if pregnant or if my period is late.

  9. diyana says:

    Hi. My period came two times in the month on august 2 then the 29 .now september is coming to an end and I haven’t got my period yet is something wrong with me?

  10. Brenn says:

    my period started 14 September and lasted till 18 th. just got married and I would want to know the probability of getting pregnant this month. thanks

  11. joanny says:

    I had my period sep. 23,2014 and I had unprotected sex sep. 24,2014 could I be pregnant

  12. Kay says:

    my Dr said i should ovulate end Sep first of oct… but then said try to get pregnant end of oct first of Nov..did she mean i may know something by then … i have been trying an my last period ended Sep 19 so just trying to get answers an not stress about it bc i know stress throws everything off

  13. Mariee says:

    i am 46 years old and for the 6 months my periods have been very irregular as for the date I start. But have always had my period each month. My boyfriend and I use just condoms. My last period was July 22nd start date, lasted 3 days. Now as of September 23rd I have not had a period. I do not use birth control, the condom has not broke during intercourse. Is there a chance I have just gone through mentapause or could be pregnant? I don’t feel the effects of either.

    • Clepetark says:

      Hi , you are right to pin point the possibility that your menopause is kicking in ! but dear ! do a test to clear that out ! Either way positive or negative, have an appointment with your physician to have a look !

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