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
Hello, my last period was May 26, 2015.. I had sex with 2 different men #1 on June 2, 2015 and #2 on June 15, 2015 . I’m patiently waiting on my period. And is there any biological way with the ovulation process I would know who the father is if I’m pregnant? Thank you
Based on a 28 day cycle, you had intercourse the week before and the week after ovulation (Expected ovulation day would be around the 9th of June) If you knew when you ovulated exactly, then you could say which man was likely to be the father, considering sperm only survives so long in the body, on average three days. So, for man one to be the father, ovulation would have needed to occur at least four days early, for man number two to be the father ovulation would need to be four days late at least. Your most fertile period would have been roughly the sixth to the eleventh of June…So man one would probably be more likely. Hope this helps!
I completely agree with Claire!
The date of my last period was may 8th my foe runs 4-5 days my ovulation is one of my worst days in life(damn painful) . I had sex with my boyfriend on 3rd of June. Till now i have not received my next period. My cycle is usually 30days
You were most fertile on May 22 to May 26 based on the date of your last period and your 30 days menstrual cycle. Your June period was due on the 7th so it is possible that you may not have been ovulating when you had sex on June 3. There may be other factors affecting the delay in your period, but it is best to take a pregnancy test to confirm.
What are the percentage chance of conceiving if you have sex the day after your period ends?
Hello Jackie. It is highly unlikely but possible that you can become pregnant the day after your period ends. With a 28 days cycle, ovulation typically occurs on the 14th day; the first day of your period is the first day of your cycle. If you have a period for seven days then by the time it ends, you would be seven days away from ovulating.
My last period was on may 2 and its June 23 my period is not on yet am I pregnant or my cycles changing.? HELP
Hi Nina. Based on the dates provided you were most fertile on May 14 to 18. Did you have intercourse during that time? Your period was due on May 30. It is best to take a pregnancy test to confirm if you are pregnant.
Hi. My last period was May 30th 2015. I had sex on June 11th and again on June 17th. I’ve been having minor lower abdominal cramping for about 4 or 5 days now. Can you tell me if there’s a chance I could be pregnant?
Hi Elaina. Based on the date of your last period and assuming that you have a 28 days cycle, you were most fertile on June 11 to 15. Since you were sexually active on June 11 plus you are having abdominal cramps, there is a high possibilty that you are pregnant. It’s best to take a pregnancy test for confirmation.
I had my last menstruation june 5 to June 8 and I had unprotected sex on 12th and 14th of June and I have been feeling weak and feeling some strange moves in my tummy. is it possible that I am pregnant
Hello Kafayat. If you have a 28 days menstrual cycle, you were likely to be most fertile during June 17 to 21. Since you had sex outside of this window than it’s possible that you are not pregnant. The feelings that you’re experiencing may be due to anxiety. Please take a prenancy test to confirm your status.
My period is irregular but I had my period on may 11 my next period was due on June 8 haven’t seemed it yet but I think I had implantation bleeding a few weeks ago what should I do or could I be pregnant
Hi Lisha. For women like you with irregular periods, it is difficult to determine when ovulation will occur because you don’t have a set mentrual cycle. Additionally, it is not possible to confirm if you are pregnant based on the information provided. The best thing to do at this point is to take a pregnancy test to confirm your status. For the long term, you can also consider using an electronic fertility monitor to help you to identify your most fertile days.
On may 30 i got my period and i was doing good until that day i found out i had put the last birth control patch n on the next friday i needed a new one. I didn’t have medicaid for more so i had to stop using them…on june 9 i got my period again..n got sick from stomach with a lot of vomiting to the point i couldn’t eat at all..on the 13 i had unprotected sex n some other days too…my period is supposed to be on june 27 because of my normal period on may 30. So what do i do..will i get pregnant? Help!
Yes it is possible you are pregnant. I don’t know what your sickness on the 9th was caused by. Based on your dates you may have had intercourse before and during your ovulation period. I would recommend taking a pregnancy test around July 5th.
Hi! My periods pretty regular- every 28 days, my last period was on 21st May. I don’t have any symptoms!! No sore breasts with usually happens a week before my period . Want do you think?
Hi on the 31st of May I see my period but on the 17th of June 2015 I see my period only one day it didn’t take 3 days please help
i had intercourse with my husband on 10/05/2015 after that i got my periods on 13/05/2015 after that we are not touch with each other but now 22/06/2015 till date i didn’t get periods 2 days i checked pregnancy test using home test kit but its shows negative please help what i need to do now
HI,
Maybe you took the test too early, i suggest you take another test but from what you explained it seems like a change in your cycle.
so my last period was may 21st my cycle is 28 days & i was due for my period this month on the 18th its the 21 of june & i havent came on yet i took two dollar store test & they were negative after today i’ll be 4 days late what should i do ?
Hi Capri,
wait 7 days and take another test in the morning,if its still negative i suggest you visit your doctor to find out whats wrong.
good day!
I have a somewhat difficult situation
My last period was on june 6 then my bf and i had sex on june 13 and 14….i bleed at june 17…i thought it is a implantation bleeding? So i took a pregnancy test at june 21 and it is negative….im not sure if it is a false negative result or what….i need your sugggestions or comments if i am pregnant or not? Im a bit worried
HI Fate,
Try not to worry too much because stress causes a lot of changes in women menstrual cycles,take another test in the next 7 days preferably in the morning when you are wake .
thank you Ms. Kelly..it turned out that the bleeding was caused by “rough sex” as what i’ve been told but thank you =D have a great day
my period started at june 26….it was early though…but I am now fine thanks again
Hello, i just want to know because i had
My period on may 27 and finished june 1 and i had intercourse on the 6 of june
I did a pregnancy test and both said negative i did them 2 weeks after.
According to your dates, your chances of pregnancy seem low. You still had another 8-10 days to begin ovulation, by then the semen would have been low in energy and effectiveness. Most likely, you are not pregnant. But for more accurate test results you should wait until 5 days after your missed period, which would be around July 6th.
My last menstruation period was on the 8th of June, when is my ovulation time or fertile period?
Hi Jume,
In order for me to assist you I need to know the length of your menstrual cycle. What was the date of your period in May?
I had my period from 25 to 30 may since then have had sex almost every day. On the 8 my breasts started hurting till today. I have had stomach cramps and backache. could I be pregnant?
Hi there,
I advice that you take a pregnancy test, if you ovulated early you could be pregnant.