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.

226 Responses to “”

  1. Amber says:

    Hi, the first day of my last period was September 22 and ended on September 26. I had sex on September 27th, my period was due October 22th and it came on October 25 but my flow was extremely light compared to my normal flow and it lasted 4 days instead of 5. Could I be pregnant?

    • Clepetark says:

      Hi ,

      being pregnant on a single day of intercourse, 10 to 12 days before your fertile window is like winning to the loto … possible but extremely unlikely. Test yourself it is the only way to clear your mind. It is happening as well to have lighter flow … or even to skip a full cycle.

      Good luck

  2. Ashley says:

    I had my last period September 24th. I should have started last Friday Oct 24th as I’m always 30days… FOR 2 Weeks & today I have had cramps on and off (Usually only happens 1 week before period). My stomach feels tight & achy.(at night when I lay on my side also) I also have been pooping a a lot T.M.I Not sure if that’s related. I was really wet this week I should have started. Every time I felt like I was getting my period it was just wet. I have been with the same guy for 3 years now & we have been trying/not trying on and off. I’m nervous about testing because its always negative.. but I feel my weird & my period is almost 1 week late. Any Ideas???

    • Clepetark says:

      Hi dear !

      Test yourself ! If it is negative, visit your physician… it can hide something else that need to be looked at…

      Good luck

  3. nicole says:

    My cycle came October 7-9 which was odd bc i have a 5 day cycle & its never irregular. My bf & i dont use protection but he pulls out everytime. We had sex on the 10,11,12,19,25,&26 of this month. Yesterday a.m. i used the bathroom & saw blood when i wiped but that was it, and same thing happened this a.m. What can be going on?

    • Clepetark says:


      First, let me inform you that the pulling out method is not a contraceptive method as it is only 74% reliable… against 99.99 for condoms. Being irregular from time to time can happen in a women life for many reason such as stress new life style or new gym routine. You should test yourself for a possible pregnancy. If you are not comfortable with your symptom, a visit to your physician is always a good option also

      Good luck

  4. Kate says:

    Hi, my period came on Sept 25th lasted 7 days then 3 days later i had light spotting for 4 days then it stop. Since after i have been experiencing pregnancy-like symptoms. So what I was wondering is, is it possible to have a period and still implant onward…. just curious????

    • Clepetark says:


      it is quite possible, as some women experience period like bleeding during the first trimester … the only way to figure out is to test yourself ! Spotting is not unusual as well from time to time !

      Good luck !

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