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 our 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 Contents
- 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.
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
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.
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.
FAQs
How do I calculate the length of my cycle?
Can I have sex during my period?
What is the average length for periods?
My period is really heavy; what can I do to change that?
Can I get pregnant if my periods are irregular?
How do I know if I need to see a doctor because my heavy periods?
Can I prevent PMS?
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
My last menstrual cycle was 10-1-15 I always start on the first of the month but i still havent started my cycle. I have taken my first hpt tonight and it showed negative. What should I do?
Your period may be missing for other reasons besides a pregnancy. Read more at this link http://womanjunction.com/8-mess-period/
Had my period on the 3rd July 2015 and again on the 28 July. I’m pregnant and would like to know when did I conceive.
Since your last period was on July 28, it is likely that you conceived on August 11, 2015. You are now 14 weeks pregnant.
Hi my last period was on the 21 October 2015, in September was on the 18 September 2015 I want to know when is my next I am worried I had sex on the 3 November 2015
If your period is regular then you would be fertile from November 07 to 11, 2015 and your next period may be due on November 23. It’s highly likely that you did not conceive.
Hi, my period usual come on the 8th – stops on the 13th but recently I started I got sick and lost a lot of weight and since then it comes before the usual time sometimes on the 6th it starting to come earlier than usual. Should I worry?
Changes in your mental and physical state will affect your menstrual flow. You’ve already identified your illness as the contributing factor so try not to worry as this will affect your period even more.
I had a menstruation last week of October and I had a sex with someone last November 3 and now have menstruation. What is the meaning of this? Because one of my friends told me that I’m pregnant. Please, someone answer me. Please.
Your friend’s observation is incorrect. You may just be going through your usual November period. It is important to know the due date of your November period. When was your November period due?
Well I still have a menstruation right now. I just dont get it. Coz I’ve had a menstruation for the last week of October but for this month it’s in the 1st week. Does this mean anything???
I came in periods on 12th September and had unprotected sex with my husband on 18th September. I came in periods in 7th October properly as per my dates. Today is 7th November still I haven’t got my periods. Can I be pregnant ?
Hello, Yes it’s possible you are pregnant.
Hi. My last period was on October 8 and I am never late. I am having a white discharge, tender breast, tired, taking naps etc. We have been having unprotected sex for a long time…but never got pregnant.
The best way to determine if you conceived this time you should wait at least one week after missing your period. In addition, the result might be even more accurate if the test is done first in the morning as the urine is far more concentrated at this time. The urine-based home pregnancy tests offer great accuracy. Take the test at the right time for hte best results.
Hi I got my period on the 2nd of September 2015 and then again on the 10th of October they both lasted a week I am wondering when I am due again?
If your period is regular then your next period is estimated to begin on November 17, 2015.
Can I possibly get pregnant if my menstruation is irregular? Like I had a period Aug then Sept, I don’t have Oct I have. My last menstruation started on Oct 24 and I had unprotected sex dawn of Nov 6.
Yes, you can still conceive even if you have an irregular cycle. Your chances of being pregnant depend on whether you were fertile on or around the date that you had sex. It is important to know the number of days in your menstrual cycle. This information is needed to provide you with the most accurate response.
Hi my period came on 15th october and i had sex on 29 30 31 until Novmber1 so could i get prgnant?
Hi i’m confused deeply my period cycle was on same date every single months, i’ve had exactly the same period for yrs and then my period was late (usually 23rd and i came on the 5th) also been getting pregnancy symptoms and went drs who is a knob lol… well my period was lighter in color and lasted 7 days usually 4 /5. Well i have been getting more pregnancy symptoms every day… i’m in process of changing gps so cant go until registered… and on the 26th oct i bled again this time it was super heavy (very very unusual) then after 2 days i completely stopped…. then for the next 3 days i bled like spotting very lightly on and off. Also I’ve been sterilized in 2013 and have done too many test which all say negative…. i’m sick of sore boobs and feeling sick and craving random food… i never ate choc n lately i crave snickers… i have sickness pelvic pains sore enlarged boobs discharge extreme fatigue eating more smells make me feel sick unusual periods mood swings peeing more my c section scar has become hard like a bump…. please need advise 🙁
Hi, Wow sorry to hear that sounds like you’re dealing with a lot, All those symptoms could mean a lot of things example Ovarian cysts, PCOS the best thing to do is get tested by a doctor. I know it’s hard but try not to worry too much about it as stress is not good.
Hi I started my period on Oct 5-6 around that time and i had unprotected sex last night 11/2. What are the chances i get pregnant? I am supposed to start my cycle November 3-7 around this time.
I menstruated on the October 31 and ended it on the 4th of this month. What days will be my fertile period?
Your fertile days will depend on the number of days in your menstrual cycle. How long is your cycle?
The menstrual cycle will last for 28 days, which is calculated from day one of a menstrual period to day one of the next cycle. Ovulation typically occurs 14 days before the start of your menstrual period. If your cycle lasts for 28 days, you can ovulate on the 14th day like the average female. However, you will start ovulating around the 11th day if you have periods 25 days apart. Alternatively, you will not ovulate until the 20th day if your cycles are longer, like for 34 days. If periods are irregular it would be more challenging to determine the fertile days.
Will heavy growth of candida prevent pregnancy
Hi,Candida can affect fertility by making your cervical mucus thick and hostile to sperm. Women who have Candida overgrow may have difficulty detecting egg white fertile cervical mucus, especially if they experience recurrent yeast infection. It is very much associated with low immunity, stress, diet and most importantly hormones.
Hello,
I started my period on Oct. 26th, and ended on Oct. 30th (a regular period length for me) and on Oct. 31st and Nov. 1st I had unprotected sex. An app I use to track my period says that I was at the start of my fertile days when I had sex. I am now getting blood in my cervical mucus, which has only happened once before, when I miscarried about a year ago but that blood was brown. The blood is not brown or dark, but it also doesn’t seem to be super fresh, although it is still red. I am getting light cramps and back pain. I also have a history of ovarian cysts, but I’ve never had cramps like this accompany my cysts bursting, it has always been a thousand times worse.
Could I be developing a cyst? Could I be pregnant?
Thanks in advance
Once there is blood in your vaginal mucus you need to consult a doctor who can examine you and confirm whether you’re developing cysts.
Want to know when is th email best time to have sex. Going to see my boyfriend in December and we want to get pregnant
You can refer to our ovulation calculator via this link http://womanjunction.com/ simply enter the first day of your last menstrual period and the usual number of days in your cycle in the fields provided. The calculator will determine your most fertile period.
hy i have a problem i had my periods on the 3rd of september then i had unprotecd sex on the 14th of september then my periods came late on the 3rd of october since then i havent had unprotecd sex now my periods came on the 31 of october they lasted for 2days is the a posebility dat i may b preg for the 14th of september?
hy i have a problem i had my periods on the 3rd of september and had sex on the 15th of september then on october my periods came late had them on the 3rd of october since then i havent had unprotected sex my periods came on the 31 of october they only lasted 2days is there any chance that im preg from unprotecd sex of october ?