Use this menstrual cycle calculator to calculate your next menstrual period, fertile period and due date. To give you an estimate please provide the requested information and press the Calculate button (results will be shown below, together with a fertility calendar):
When did your last period start?
How many days did it last?
How long is your cycle?
Below 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
- Pre-Period
- Period Days
- Post-Period
- Peak Ovulation
Please note that this is only an estimation of your menstrual 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.
However, one of the biggest problems people have is knowing how to calculate their next fertile period. This is where technology can come in handy. You can use tools such as a menstrual cycle calculator which should provide you with a rough estimate of when you are going to ovulate next.
But of course, a period calculator is not the same as talking to a healthcare professional, so this is just to aid you in coming up with the most accurate calculation as much as possible.
Let us discuss how these calculators work and how you can maximize their use to your advantage.
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 period calculators, which still give fairly accurate results.
Using a Menstrual Cycle Calculator
The first thing that the period 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.
If you are still confused on how to determine it correctly, the Day One (the first day that menstruation started) is the starting date of your period and it can last from three days only to as long as seven days.
There are women who suffer from period pains within the first few days and can be such a dreaded time for them. It is due to the hormones in a woman’s body which cause the womb to shed the lining actively from the previous menstrual cycle build-up. Knowing this can be a bit of a relief since the pain can be excruciating and worrisome for some women.
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 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.
How To Calculate Your Next Period & Ovulation Infographic
Understanding the Menstrual Cycle Properly
While you may already have a fair understanding of your own menstrual cycle, there are women who have cycle lengths that vary. Sometimes, your own cycle can be between 23 days only or it can reach 28 or 30 days the next.
When a variation in menstrual cycle length occurs, that usually happens during the time of the cycle before you ovulate. This is referred by professionals as the follicular phase. Most women’s ovulation period and their monthly period happen between 12 to 16 days which is referred to as the luteal phase.
Understanding Your Next Menstrual Cycle and Fertilization
If you are trying to get pregnant you need to understand how the menstrual cycle works. The process starts when the thick lining of your womb starts to break up due to the decrease in estrogen and progesterone levels. Without sufficient amount of these hormones, your body will shed the lining and it will start to prepare for your next menstrual cycle.
However, if the egg was successfully implanted into the womb’s lining, your body will produce human Chorionic Gonadotrophin (hCG) or pregnancy hormone right away. The body will continue to produce the required estrogen and progesterone hormones so that the womb lining will not be shed and the placenta can grow to maturity enough that it can support the pregnancy.
Using a Fertility Calendar
The period calculator above also comes with a menstrual cycle calendar. You can navigate through different months by clicking on the NEXT 2 MONTHS and PREVIOUS 2 MONTHS links. This allows you to plan and prepare for your fertile and menstrual periods in the upcoming months.
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. You can learn more about the likelihood of conception in this article.
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 is struggling to conceive a child.
Learn more
Want to learn more about your menstrual cycle? Find out how does the Fertility Calculator work or how to to calculate your period manually.
Want to know if you’re pregnant? Take this online pregnancy test, read more about the most common reasons why your period might be late or find out when it’s the best time to take a home pregnancy test.
Do you have a question about your period, ovulation, pregnancy or any other related topic? Check out our Frequently Asked Questions page.
hi my period starts last march 4 and ends on the 10 march, we had unprotected sex on the 31st is there a possibility that i will get pregnant
Hi Joy, not generally based on those dates. That would be well after your fertile time frame. You can always check out the calendar here To determine when your re and are not fertile.
Please I don’t know what is happened, I saw my period on Feb 29, saw is again 7 march, saw it again on 3 of April. I am confused why it’s changing because I want to have a baby, and I always have a pain in my nipples and what drug can I use to notice my Ovalution or boost my fertility?
Hi Christy, you could purchase ovulation tests. You can get a huge pack of the cheap (but effective) ones online or from your local store. THey can help to determine when you are fertile so you can make the best decision as to when to have sex. You can always talk to your doctor to discuss other options, medicinally, as well.
Hello
I had my period on 14 to 16day of march and I had sex on the 30th of the same month
Could it be that I am pregnant
Hi Jackie, it appears to fall outside of your fertile period so most likely not, however it depends on how long your cycle is as well. This was calculated based on a 28 day cycle.
Hi just wondering if you can help me, I had my period on the 24th of March 2018 and had unprotected sex on the 30th March 2018 could I be pregnant?
Hi TyJess, it appears that you would be a little early for your fertile period which would have been starting the 3rd of April. So if your cycle is normal then most likely not.
Need advice,my LMP is on 05/03/2018 and now 31/3/18 I saw clots or spotting?im confuse now?
hi Emzz, it could be your period as based on a 28 day cycle it would only be two days early which is completely normal. Two periods in a month is common if you get one very early in the month.
My last period is February.26 to March 2..until now my menstruation period is not coming..what should I do?
Hi Kyzzer, have you taken a pregnancy test? How long is your cycle normally as based on a 28 day cycle you would be about a week late at this point.
I last had sex in 1st week of Jan I got my periods of that month ,even of February month, but in this March month I didn’t got periods until now,my periods date is 18th of every month.what could be the reason of my periods delay?
Hi Pinky. Did you get your period in March? It seems like based on your comment you did. There are a lot of things that could cause your period to be late from stress, medication, being sick, changes in weight and eating habits. If any of these things pertained to you then it could just be normal as it happens sometimes.
Hiya I am 40 41 this year
I had sex on the 25th of March
I came on the 10th my last conceive Date was the 24th would I be ok
I am just a be worried as all I keep doing is sleeping and eating so much and I keep getting pains in my belly hope you can help me
Kind regards
Selina
But I would come on the 7th April
Hi Selina, do you mean your period would be on the 7th? It could be PMS or it could be pregnancy. I would wait to see if you miss your period and then take a pregnancy test if you do miss you period by 5 days at least. Good luck!
Hi my name is Karlie my last period was on February 23 and last about 5days it had went up on the 1st of March I had sex on the 17th of March is there any chance I can be pregnant or when will my next period be ?
Hi karlie, you were due for your period, if you are on a 28 day cycle, by the 23rd of March. You can tell that by looking at the calculator which can be found here But if you still haven’t gotten it I would recommend a pregnancy test.
i had my period 13 march and i had sex on 28 march can i be pregnant
Hi Mary, that was within your fertile period so yes, it is quite possible. Your next period is roughly around the 10th of this month, so if you are late, take a test a few days after that.
Hi, my wife’s last period was the 24 feb after we’re doing it March 8. Now she have period starting but coming blood Littile only its means she pregnant or no
Hi Anu, it’s quite possible, has she taken a pregnancy test?
Hello, i need some help. I had my period in 5th January 2018, and again in 2nd February 2018 again in February 28. I was having unprotected sex with my husband from March 4th, then in 27 March night i saw some spot of bleeding and today 28 march just 1drop of blood when i was peeing. So i am very confused, can you tell me what is happening. Thank you so much ❤️
Hi Alma, if what you had was significantly less than your regular period, I would recommend taking a pregnancy test as you could be pregnant.
Hey my period started on 16 to 20 and immediately it stop I had unprotected sex from 20 to 26 is there a chance of me getting pregnant…..
Hi Love, from the 26th to the 30th appears to have been your fertile period based on a 28 day cycle. So it is quite possible that you are pregnant.
my last menstrual period is on february 28th and now is march 28th. Is it possible that I am pregnant?
Hi Rachelle, it’s possible that you are if you had sex during your fertile period. I would recommend giving it another day or so (the 28th would put you at a 28 day cycle, unsure as to what your regular cycle is), and then take a pregnancy test if you don’t get your period. Good luck!
Hey my period started on 5th to 8th… We had unprotected sex on 16 of the same month that is days after my period… Can it be that am pregnant….
Hi Nino, that would be right in the middle of your fertile period so it is quite possible that you are pregnant. Take a pregnancy test if you miss your period.