You want to know the dates of your next period, ovulation or due date? You came to the right place. If you’re in a hurry you can go straight to out menstrual cycle calculator (click here) or Infographic with key information about calculating your period (click here). Check the full table of content below.
Table of Content
- Introduction
- Period & Ovulation Calculator
- How Do Menstrual Cycle Calculators Work?
- Using a Period Calculator
- How To Calculate Your Next Period & Ovulation Infographic
- Understanding the Menstrual Cycle Properly
- Understanding Your Next Menstrual Cycle and Fertilization.
- Some Important Information Regarding the Calculator
- Learn more
- Frequently Asked Questions
Introduction
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 when women are in their most fertile period. Ovulation usually happens around day 14 of the cycle [1]), while there is a greater chance of a sperm reaching the egg and fertilizing it.
However, one of the biggest problems and question that people have is knowing how to calculate their next ovulation date and when is the best time to aim for intercourse. This is where technology can come in handy. You can use an ovulation calculator, like the one below, to get 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 possible, on your own.
Also, keep in mind that these calculators will be useful to women with a fairly regular menstrual cycle. For women with irregular menstrual cycle tracking other ovulation symptoms or using an ovulation predictor kit might give more accurate results, all of which we’ll cover later one.
Ovulation & Period Calculator
Use this period calculator to calculate your next period (menstruation), fertile period, ovulation, and due date. To give you an estimate as to when those time frames are, 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
How Do Menstrual Cycle Calculators 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.
While there are women who measure their basal body temperature, it’s not something that the everyday woman uses.
However, it is a rather accurate way (when done 100% correctly) to determine when a woman is ovulating.
Some feel that these types of cycle calculators are “overkill”, but for those who are using the basal body temperature to prevent and plan a pregnancy, they have this information handy.
If you aren’t into this type of strict monitoring, a simple calculator like the one provided here can give you really good results and help you plan.
Using a Period Calculator
The first thing that the period calculator will ask you is the date of your last period. With so many apps available now, this should be information that is readily available.
And just remember, when calculating your period, you use the first day of your last period. This was the beginning of your cycle.
If you don’t know the exact first day, calculate back from the last day however long it lasted, and start tracking now. Especially if you are trying to get pregnant.
Some will use a menstruation calculator to figure out when to expect their periods and when to expect PMS. PMS is due to the change in hormones that cause periods and pregnancy.
When you are pregnant or during your period, these emotional and physical symptoms subside [2]. Some women can then plan to change their diet a few days before they expect PMS and help to alleviate some of the symptoms.
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, others it could be as low as 25.
However, you are only after an average here. Being as accurate as possible is important as this will affect the results that you are given which can have a profound effect on when the calculator tells you is the ideal time to try for a child.
Finally, you will be given your results. Based on the information you provided, it will calculate when your next period is anticipated and also your fertile period which is when you stand the best chance to get 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 as short as 23 days on cycle and 28 or 30 days the next.
When a variation in menstrual cycle length occurs, it usually happens before you ovulate. This is referred to as the follicular phase which encompasses menstruation as well and ends when you ovulate [3]. A woman generally ovulates between days 12-16 of their cycle which is the start of the luteal phase [4].
There is a multitude of reasons as to why your period could be altered, be it stress or medications, even weight gain/loss or travel. Unless you think you are pregnant, it could be a myriad of reasons that have your period coming irregularly.
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 a sufficient amount of these hormones, your body will shed the lining and it will start to prepare for your next menstrual cycle.
However, if a sperm does make contact with and fertilizes the egg, it will close all pores to prevent more sperms from getting in there. The fertilized egg will stay in the fallopian tube for 3-4 days and then move to the uterus and attach to its wall, staying there for the long haul of pregnancy.
Your body will produce human Chorionic Gonadotrophin (hCG) or pregnancy hormone right away (which can be seen within 6-8 days by a blood test and can take about 2 weeks if not longer to be seen in urine tests) [5].
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 mature enough that it can support the pregnancy.
Some Important Information Regarding the Calculator
The period calculator above also comes with a fertility 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.
Your fertile period gives you a good range in when to have intercourse to potentially get pregnant. You can learn more about the likelihood of conception in this article.
That being said, the menstrual calculator is still an extremely useful tool. It provides a simple way of knowing when to anticipate your next period and when is the best time to try for getting pregnant.
This could be a huge help for those with busy schedules to plan their days to start their family.
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.
FAQ How do I calculate the length of my cycle? From the first day of your last period to the first day of your next period. That would be the length of your cycle.
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Can I have sex during my period? While it’s messy, some women are more turned on during their periods. Throw down a towel and have fun. It can ease cramps and PMS symptoms and even shorten the duration of the period [6]. While all sound like great things to me.
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What is “average” for periods? Average depends on the person, but the most reported facts about your period are that they last generally from 3-8 days [7]. Everything else is based on the person, whether they get PMS symptoms such as bloating and cramping, and how heavy the flow is. This can also be dependent on birth control usage.
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My period is really heavy; what can I do to change that? Many women take birth control to regulate their periods. The benefits of this would be to potentially stop ovulation, change the lining of the uterus as well as changing the cervical mucus. This can result in lighter, more regular and even nonexistent periods [8] (some women don’t get a period while on birth control, with the exception of Paragard users which is non-hormonal). It can also help relieves PMS symptoms and acne too all while preventing pregnancy.
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Can I get pregnant if my periods are irregular? Yes, but it makes calculating ovulation a bit harder with only a calculator. Ovulation tests might be more helpful.
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How do I know if I need to see a doctor? If you are going through more than 10 pads or tampons per day or soaking through one an hour, then it’s time to talk to your doctor about it [9]
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Can I prevent PMS? If your body is made for PMS then generally not get rid of it completely, however, hormonal birth controls can help, as well as cutting back caffeine and salty foods and increasing exercise before your period may help [10]
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From the first day of your last period to the first day of your next period. That would be the length of your cycle.
While it’s messy, some women are more turned on during their periods. Throw down a towel and have fun. It can ease cramps and PMS symptoms and even shorten the duration of the period [6]. While all sound like great things to me.
Average depends on the person, but the most reported facts about your period are that they last generally from 3-8 days [7]. Everything else is based on the person, whether they get PMS symptoms such as bloating and cramping, and how heavy the flow is. This can also be dependent on birth control usage.
Many women take birth control to regulate their periods. The benefits of this would be to potentially stop ovulation, change the lining of the uterus as well as changing the cervical mucus. This can result in lighter, more regular and even nonexistent periods [8] (some women don’t get a period while on birth control, with the exception of Paragard users which is non-hormonal). It can also help relieves PMS symptoms and acne too all while preventing pregnancy.
Yes, but it makes calculating ovulation a bit harder with only a calculator. Ovulation tests might be more helpful.
If you are going through more than 10 pads or tampons per day or soaking through one an hour, then it’s time to talk to your doctor about it [9]
If your body is made for PMS then generally not get rid of it completely, however, hormonal birth controls can help, as well as cutting back caffeine and salty foods and increasing exercise before your period may help [10]
Do you have any other question about your period, ovulation, pregnancy or other related topics? Check out our Frequently Asked Questions page.
References
- Your Fertility. Women’s Guide to Getting the Timing Right [link]
- Mayo Clinic. Premenstrual Syndrome (PMS). [link]
- Better Health Channel. Menstrual Cycle. [link]
- see above #3
- WebMD. Pregnancy and Conception. [link]
- Eleanor Jones via Cosmopolitan. 10 Questions Period All Guys Want Answered [link]
- Playtex. Period 101. [link]
- The University of Iowa. Birth Control Pill Fact Sheet. [link]
- WebMD. Slideshow: Answers to Your Top period Questions. [link]
- see above #9
I had my cycle on July 16th lasted for five days. Then, my next cycle didn’t start til August 27th only lasted two days (Light cycle).
Hi, some women have longer cycles than others. If it’s abnormal, take a pregnancy test just to be sure (if there is a possibility of you being pregnant). Otherwise, something during your cycle could have affected it. I would consider it your period though and see what next month has to offer.
my last period is august 22,2019 i have sex august 30,2019 is there possibility that i get pregnant??
Hi, your fertile period would have been from the 1st of September, so you appear to have been outside of the timeframe in which you could get pregnant.
My 1st day of last period was on 23 June and July 3 had sex and again I had sex on 6july and 7 July.. I ultrasound on 7 September and I found I am 7 weeks 5 days pregnant…so which sex date is most possible to conceived? 3 July? Or 6 or 7 July??
Hi Tina, based on the conception calculator, you would have conceived sometime between July 3rd to July 11th. It could be any day honestly. If you are concerned about who the father is, then the only way to determine that is by a DNA test.
hello my last period was August 5th, 2019. I had unprotected sex with my husband August 21 and 22 then again August 26. i have irregular periods so I never know when I will get it. I have taken 3 pregnancy test and all came back negative. Could there be a chance I can be pregnant or is my period just coming late?
Hi Ana, since you say you have irregular periods, it’s really difficult to give you some sort of answer that might be correct. You don’t know when you ovulate because it isn’t on a regular schedule and missing your period could either be normal, or pregnancy related for you. I would say that you can continue to take pregnancy tests, but don’t get too discouraged. If you are trying to get pregnant and have been trying for a while, discuss it with your doctor because they can sometimes help to get your body ovulating on a more normal schedule in order to help you get pregnant. Good luck.
Goodmorning ,it has not been easy to calculate the ovulation for me ,and I want to get pregnant this year my September period is on the 2 which I comes for 3day my circle is 26 days when will is it the right time for me to have sex
Hi Shade, the best time would have been from the 10th to the 14th of this month (September). If your periods are regular and 26 days, then your next best time to has sex would be the 6th to the 10th of October, assuming that you have your next period on about the 28th of September. Good Luck!
MY LAST PERIOD WAS ON AUGUST 5TH, 2019. I HAD UNPROTECTED SEX WITH MY HUSBAND ON AUGUST 21 AND 22 THEN AGAIN ON AUGUST 26. I HAVE IRREGULAR PERIODS SO MY CYCLE IS NOT THE SAME SO ITS VERY HARD TO KEEP TRACK. I DON’T HAVE ANY SYMPTOMS AND I HAVE TAKEN 2 PREGNANCY TEST AND BOTH HAVE BEEN NEGATIVE. DOES THAT MEAN I AM NOT PREGNANT AT ALL OR IS THERE A CHANCE I COULD BE?
Hi Ana, because you have an irregular period, it’s impossible to give you a great answer. I would recommend seeing your doctor if you are trying to get pregnant and haven’t been able to for more than 6 months. They can help to get your body ovulating better and more regularly. Good luck!
Help Dr,I saw my period on Monday 26th of August 2019,it ended Saturday 31st .Am still seen trace’s of blood each time I urinenate pleas just want to know if is normal, although I was diagnosed of fibroids late last year.
Hi Victoria, if you were still seeing some spotting the next day that is normal. It could just be remnants of your period.
Hi
My problem is that I usual don’t know the days of my period be it 28,29 or 31…it do changes atimes.
For a example now…I saw my period on the 5th of July 2019,then I saw it again on the 28th of July…then this month August I saw it on the 23rd…pls when am I expecting it next.
Am just confuse!
Pls help me
Hi Sonia, it seems that your period falls roughly on a 23-28 day cycle. If it does, then you can anticipate your next period roughly on the 18th of September.
I saw my period on 26 August and is 36 days cycle. I had sex on 7,8,9,10,11 of August and I felt abdominal pains, weakness I felt I was pregnant, I started seeing my period on 26 of August, pls help me clear my doubt is 7,8,9,10 of August my fertile period.
Hi Nancy, I’m confused beau you say that your period was the 26th of August which would mean that you are not pregnant. Even if you had sex in July during those dates or at the beginning of August you are still fine, especially if you had your period.