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.

169 Responses to “”

  1. Neish says:

    Ok hello, I haven’t seen my period since the 29th of July. My period usually is irregular but it’s now Sept 17 and it hasnt come on as yet? could I be pregnant?

    • Clepetark says:

      Hi , Yes being pregnant is possible, other rason can make you skipping a cycle such as stress, new diet or gym routine. By now a simple pee on a stick can give you a clear answer… If it come negative, please visit your physician that can give you more answers

      Good luck

  2. JF says:

    Hi. I had unprotected sex on the last day of my menstruation just last sept1. I calculated here that I’m fertile in sept 9. Could i be pregnant?

    • Clepetark says:

      Hi , I already did ! became pregnant having unprotected sex late in my period, but it is uncommon, to get in this situation you need to have 2 ovulations in the same month. You can test yourself as of sept 14 for the unprotected sex you has on sept 1 st, test should be reliable.

      Good luck

  3. Jessica says:

    The site gave me the dates Sept 8-13 as my most fertile. If we did conceive, when would be the earliest date we could test positive?

    • Clepetark says:

      Hi. you will get a positive result if you conceive 14 days after the fertilisation ! so track in these day the last day you had intimacy and it will be for sure covering the previous attempt. You will notice that this lap of time is close to the moment your next periods are due, if you have a regular cycle !

      Good luck

  4. Tinks says:


    My last period was on the 11th of August & i still haven’t come on my period. I still keep getting cramp type feelings and lots of “bubbling feelings in my tummy – I put these done to been anxious, but could it be signs of early pregnancy? as i’m now 4 day overdue on my period.

    Please help :/

    • Clepetark says:

      Hi , Well ! I guess that if you worry at this point is that you always had a clock set cycle ! Anxiety is the first reason why the period cycle getting disrupt along with dieting and intense exercising. If you doubt being pregnant .. to reduce the stress going along the unknown, test yourself ! Skipping a cycle is not dramatic but if you skip a second one I strongly recommend you to set a visit with your physician to make sure everything is all right !

      Good luck

  5. Gwenny says:

    Hi, the first day of my last period was August 11th. I had unprotected sex on Sept 7th(the only time I did have sex since my last period) but before then I already had signs of the next period (softened breast). Yet till today Sept 11th, my period has still not started, could I be pregnant?

    • Clepetark says:

      Hi , for a single try .. I have doubts but nothing is impossible. As soon you have 14 days past that day you had unprotected sex you can test yourself, with morning urine, you will get a good result as it is the one containing the higest concentration of HCG, if you are pregnant

      Good luck

  6. betty says:

    Hi, my period hasn’t start since july,19 , 2014 it’s sept.10 and no period no sign of pregnancy had negative test on all pregnancy test I’ve done.what should I do?

    • Clepetark says:

      Hi, what changed in your life more then your period ? gym, diet, job, stress … age … skipping a cycle is not abnormal, but if you feel uncomfortable to skip a second one, have a visit to your physician, he will have official answers for you !

      Good luck !

  7. bak says:

    Pls help I saw my mense on 8/8/2014 now is september 11 I’ve not seen it why

    • Clepetark says:

      Hi , depending if you always had a regular cycle or not, it might not be a major issue. As I am often saying stress, diet or gym routine can lead your cycle to delay or change. If you have doubt that it can be due to a pregnancy, test yourself to clear your mind from all your uncertainty.

      good luck !

  8. Ash says:

    Hi I have a question and i need some feedback. Ok In july i started my Menstrual Cycle July 26 and 15 days later i was back on my Menstrual Cycle Aug 10. Now 31 days later I still havent had a period what can be goin on?

    • Clepetark says:

      Hi , you have an irregular cycle, always been like this or it is new ? new gym routine? stress ? new diet ? all these reason can lead to see some changes in your cycle, age as well … if you get close to your menopause. If it still keep being erratic and feel uncomfortable about it, visit your physician for some answers !

      Good luck

  9. laylay20032 says:

    My last period was August 22nd-24th. It was unusually short. I usually stay on for 5-7 days and my boyfriend and I don’t use any protection at all. I have been experiencing nausea for the last 2 weeks. Is it possible I could be pregnant even though I haven’t missed my period yet?

    • Ana says:

      period can vary in length. as you got it last month it seems you’re not pregnant.
      however, you’re taking a great risk if you continue having unprotected sex

  10. Sara says:

    Hi,my last period was July 14,2014,I had play with my boyfriend and he ejaculated just rubbing his penis to the upper part of my vagina I am sure it never touched the opening of my vagina,it was August 8 to 12,my period doesn’t come yet.and we are now in sept.7,I am 50 years old.

    • Clepetark says:

      Hi ,

      I have big doubt that you might be pregnant, but we never know life is always finding its way, test yourself, if it come negative, I recommend you to have an appointment with your physician .. might be the first sign of your menopause.. as skipping cycle is what happening at the beginning.

      Good luck

  11. jenny says:

    Hi I missed my cycle, it was supposed to come on August 23 and I still haven’t got it…….. any answers

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