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 period was on 23 June. I had unprotected sex from 3rd July. I feel sickly, am I pregnant?
It is possible that you may have conceived. But I do not know the length of your cycle so I can not say if the chances are high or low. I can only recommend you take a pregnancy test around the 25th of July.
my period first began on may 14,2015 and came again on june 8,2015, the calculator says it will come again on july 3rd, but it is july 13 today, so what’s the deal?
Hi Steffy. I have been on Norplant from October 2014 to May 2015. During this period, I was not menstruating. I had my first menstruation on 16-18th June and I had unprotected sex on 20th and 29th June. I am feeling bloated and I had some diarrhoea and feeling pain on the sides (ovaries) as well as feeling heavy under my belly button. Can I be pregnant?
If you have a 28 days cycle then you were ovulating on June 28 to July 2. It is possible that you conceived on June 29. Your period is due on July 14; take a pregnancy test be July 16 if your period is late.
I had sex on the 27 June and again 29. I had my periods on the 5th of July, but I have the funny feeling especially in the morning. What are the chances that I might be pregnant?
i was on norplant for 8 months i just removed in may 2015 and my first mensturation was on 16th to 19th june 2015. i had unprotected sex on 20th and 29th june. i have been feeling pain on the sides under my berry button and i am feeling some sort of heaviness under my berry button. can i be pregnant? when is the right time to take the pregnance test?
I had my period June 24th. Had sex like wildfire up until two days ago (the tenth). Been having creamy white Cm and nipples have been EXTREMELY sore. I know it’s too early but could it be possible the egg made it to its destination faster than thought? Second ttc. First preg ended up in MC.
You’re correct. It would be too soon to say if you’re pregnant. You will have to monitor your symptoms and wait until your next period is due.
I had my period the same day, June 24, my next period was due on July 20th. Today is now the 23rd and still no period. Any updates?
Hi. I had my period June 17-22. My app said that my fertile days were June 29 – July 5. The period app also told me I am ovulating July 4. I used an ovulation kit right when my period ended and it came up positive for ovulation on July 4 & 5. On July 6 I started to have light spotting. It was brownish and creamy. Then Thursday it was light blood reddish color with small blood clots which looked like mucus. Today is Sunday and I still have spotting. My period isn’t due till July 18. I am on 31 days cycle. I am TTC and have had sex every other day till July 6. I have had mild cramps in the am, going to the bathroom a lot, and my bras are tighter, I also have gained about 5 pounds. I take pre natal vitamins. Could this be implementation bleeding? I wore a pad and nothing comes on it. I only notice spotting when I wipe going to the bathroom. I know this is a lot of information and very detailed. I just figured maybe this has happened to someone else.
Your 31 days cycle would surely make you fertile from July 2 to 6. It is highly likely that you conceived during this time. The best way to confirm this is to take a pregnancy test by July 20 if your period does not come by July 18. In the interim, you can read this insightful post on ovulation bleeding http://womanjunction.com/facts-about-ovulation-bleeding/ and you next period would be due on July 18.
So I had my period on June 22nd for five days, I’ve had intercourse every day since the last day of my period til July 11th, I just got the para guard removed on June 12th. What are my chances of being pregnant? I’m not having any kind of symptoms… I have two children already, but both of those times were unexpected. This is the first time we are actually trying and I don’t know what to really look for, I feel like I’m just being antsy and want to be pregnant like yesterday. LOL.
Your fertile days depend on your menstrual cycle. If you have a regular 28 days cycle, you were fertile from July 4 to 8. It is possible that you conceived since you were ovulating during the time you had sexual intercourse. Your next menstrual period is expected to start on July 20, 2015. Take a pregnancy test by July 22 if your period does not come. The symptoms can vary with each pregnancy and individual so it’s best to wait and see if you have a positive test result and take it from there.
Hi, had my last period June 12 to 14 2015, and I have a 27 days cycle. I have not seen anything yet…feeling very weak. Can I be pregnant?
Your most fertile period was from June 23 to 27. If you had unprotected sex during that time, your chances of getting pregnant were high. You need to take a test by July 17 to confirm if you are. Missing a period may not always be due to pregnancy so take the test first and then take it from there.
So when
I had my last period on 27th June 2015 but it finished on 26th June 2015 I was with this boy and we had unprotected sex and again on 30th June 2015and with this guy on 29th June 2015 and 8th July 2015 really wanna know who the dad will be and if im pregnant I toke a test it was positive
I saw my period on 13th June and today is 12 July does it mean that am pregnant? Though I have some cramping all round my stomach two days ago.
You were fertile from June 25 to 29 if you have a 28 days cycle. Did you have unprotected sex on any of those days? Since your period is late you need to take a pregnancy test by July 16 to determine if you’re pregnant. Remember also that a delayed period may be due to other factors such as stress and hormonal imbalances.
When will my actual period start
I have a 28 days cycle. I had sex on June 16, 18 to 20. Got my period on June 27 for 3 light days. Could I be pregnant even though I had my period? Took 3 tests, 2 were negative and 1 was a very faint positive. Is it too soon for a positive pregnancy test?
Taking another test now should give you an accurate result.
So when will my period start again
Sometimes my menstrual cycle is 27 days other times it’s 28 days. I want to know if it’s okay because I’m getting married at the end of next month and want to track my ovulation period for the month of Sept. Please, what should I do?
It’s normal for your cycle to fluctuate. You can schedule your wedding plans using both cycles – determine what your fertile days are on a 27 days cycle as well as your fertile days on a 28 days cycle and plan around that. Getting married can be a stressful time and your cycle may be affected so try not to be too anxious.
Hi,
I would like if someone could help me please. My period last month was 14-19th June but in May my dates were 19-26th. My period is due tomorrow but normally I would have spotting 3-4 days before my period. I don’t know if I could be pregnant right now or not. Could someone please explain, please. I have sex with my partner every day and we are trying for a baby. This time 7 years ago I got pregnant with my son.
Do you usually have an irregular cycle? You have to ensure that you track your fertile days in order to identify the best days to have sex. Once you have sex on these fertile days your chances of getting pregnant will increase. Having sex every day without knowing when you’re ovulating can be very frustrating. These posts can provide useful insight
http://womanjunction.com/usual-ovulation-symptoms/
http://womanjunction.com/ovulation-predictor-kits/
My last two periods were May 10 to 16, and then June 9 to 15, 2015. I had sex on July 5. My periods are very irregular. But the expected start date was supposed to be either July 10 or July 6th. Is there a chance I could be pregnant?
Having irregular periods make it difficult to identify your fertile days. You can take a pregnancy test by July 27 to confirm if you’re pregnant. If you did not conceive this time around then it may be best to use an ovulation predictor kit to help you identify when you’re ovulating. Please read this post, it will provide some useful information. http://womanjunction.com/ovulation-predictor-kits/
Hi there. I got my period on the 26 June 2015. And it lasted a week (2 -3 days bleeding {fresh and old} and day 3-7 was like dark lines of old).. this week I feel bloated and anxious. Could I be possible pregnancy?.. we are trying to conceive btw. Thank you…
If you had sex while you ovulated then you will be at risk of getting pregnant. Your cycle will also help to determine your fertile days. It is not possible to say if you’re pregnant without knowing this information.