Menstrual cycle    Pregnancy Test     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.

383 Responses to “”

  1. omojowo omobolaji says:

    my last period date is 27th of December last year, I had sex on 9th and 11th of this month, is it possible that I am pregnant

  2. april says:

    i started my period on the 20th of december 2014, had sex on january 10th 2015, at 3am it is now january 23 2015 no period yet , just wondering what my chances are of being pregnant

  3. Detrice says:

    My last cycle was Dec.4-9th 2014 and here it is Jan.23 and my breast are sore and I’m constantly feeling sick to my stomach..can I be pregnant I don’t want to take a test then it says negative but if I am this will be my second child

    • Clepetark says:


      If you did not had your january periods … I would take a test … as you are indeed deeply late. And … better to know then to wait until you have no leverage on the decision to take on the future of a possible pregnancy

      Good Luck

  4. shorty says:

    Hi I had my period the 22/12/2014.I had unprotected sex 2 days after my period that the fertile days was 3-7 of jan I had unprotected sex the 7th of Jan on my fertile day. I was having period like cramps from the 29 of dec on and off come right up to the 17 I took a pg test 7 days after the 27 it was negative. I have abdominal pain, eat a lot, pee, am tired during the day but can’t sleep. my left breast is swollen my mouth is fresh I feel stomach cramps feel bloated. Each time.
    I eat I feel like I want to throw up I also feel gas I also had unprotected sex on the 18th of this month, 2 days later I had something like period please I need help can someone help me

    • LMLawson says:

      Take another pregnancy test. If you don’t want a baby I would suggest using protection, you appear to be having alot of unprotected sex. I don’t mean this as a judgement.

    • Clepetark says:


      everything is possible but the last day of your fertile windows is the most probable one that could be triggering a pregnancy, but … your symptoms can hide something else. Please test yourself home, it is negative, I strongly recommend you to visit your physician for more answers.

      Good luck

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