How to Use Period Calculator

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Are you having problems determining the dates for your monthly period? If so, you should know that a period calculator will help you to estimate the date for your next menstruation. This calculator can give estimated details including the starting dates for your periods over the next twelve months or the next year.

You might be thinking that you don’t need to know your period date for every month, but imagine how this information will come in useful if you are actually planning to conceive. The calculator is very simple to use. You are only required to input the starting date for your last period, in addition the average length of your menstrual cycle.

Please select the first day of your last menstrual period:

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Usual number of days in your cycle:

A calendar can be used to keep a track of your monthly periods, so this is a good way to know the first and last days. As for the length of your average cycle or period cycle, this would be the time length in days, starting from Day 1 of a menstrual period and ending at Day 1 of the other. A normal menstruation period can take 2 to 7 days.

After entering the required information, the calculator will present the dates in no time without any hassles!

Menstrual Cycle

Most couples have a hard time when trying to conceive naturally, with some taking about one year. If you can relate to this, then you need to take time to understand menstrual cycle as well as the calendar for ovulation as this can improve your chances of conceiving. Knowing your menstrual cycle will help you to ascertain your ovulation days more accurately.

There are three phases in the menstrual cycle: the follicular, ovulation and luteal. The period for ovulation will be your most fertile time and this will occur about 10 to 12 hours after a LH surge. The length of your menstrual cycle is the number of days that the cycle lasts, which is different from the length of your period. The day when your period begins is cycle day; the beginning of a brand-new menstrual cycle.
On average, 28 days is the length for a woman’s menstrual cycle and the period length is 3 to 5 days. However, this is not the case for everyone as some have longer or shorter cycles which can vary monthly by a few days.
To calculate the length of your menstrual cycle, you can count the days from the first day of your period and go up to the day prior to the start of your next period. In turn, the average cycle length can be calculated by adding the length for each individual cycle and then divide by the overall number of cycles.

Ovulation

Ovulation occurs whenever the ovary releases a mature egg into your fallopian tube in preparation for fertilization. If you have been trying to conceive without success, then it is very important to understand your ovulation and menstrual cycle. Knowing this will help you to predict your most fertile days. An ovulation calendar is a proficient tool that can help you to ascertain your ovulating days.

With the help of an ovulation calendar, you can calculate the days when conception is most likely to occur. This calendar can be supported by an ovulation kit as it offers a great way for you to double check the high fertility days.
The ovulation calendar calculates the odds of conceiving by using a method that is based on the ovulation period as well as other factors such as the life expectancy of the egg and sperm. It will provide information that is even more accurate if you know the length of your menstrual cycle. A simple way to determine this is to track the number of days in your cycle, for around 3 to 4 months. You could have the regular 28 day cycle like most women, or it can vary between 29 and 32 days.

Calculating Due Date

When you get pregnant, you might be anxious to know your due date, just like every other expecting mom. In this case, a due date calculator will come in really handy. This tool will use the first day of the last period in order to calculate when you will give birth. It also uses the estimated time for your ovulation to determine when your baby will be born.

All you have to do is type in the exact date for the first day of the last menstrual cycle and the amount of days that your cycle normally runs. After that, you will receive an approximate date for the time when you will give birth. Note that the calculator will only give an approximate date based on the forty week calendar that is used for normal pregnancies. Furthermore, the result will be based on any data that you give. The predictions from these calculators are 80% accurate, so this is something that you need to keep mind. Of course, the real due date will still be dependent on the time when your baby is well good and ready to be born.

304 thoughts on “How to Use Period Calculator

  1. ramatu

    i had sex with my boyfriend during the fourth day of my menstruation
    I want to know if i can get pregnant

    Reply
    1. Clepetark

      Hi, yes it is , some women have double ovulation so can get pregnant while during the period. I did …

      Good luck

      Reply
    2. Clepetark

      Hi , yes it is possible there is no safe moment to have unprotected sex. Some women have multiple ovulation so can get pregnant at any time.

      Good luck

      Reply
  2. Gemmalou

    Hi
    myself & my partner have been trying regularly to fall pregnant. My period is due today, I haven’t started so I took a test and it came up negative. Given that my test kit said I could test up to 6 days before my period was due, is it possible that I could still be pregnant, or is that a definite no?
    thanks

    Reply
    1. Clepetark

      I think that for this turn … if you are already 6 days past to the earliest reactive test, you missed the boat. BUT the test takes 14 days after conception to trigger, track the last day you tried to conceive, if it is not 14 days past, test it again by then … nature is capricious sometime.

      Good luck

      Reply
  3. ajay

    hi, my last period was on october 6 2014. i had unprotected sex on november 3 2014. will i get pregnant

    Reply
  4. Aleen

    Hi,
    My last menstruation was on 9Th of Nov, 15Th October, 19Th Sep, 25Th August, 29Th July etc, every month my cycle length is getting different with 26, 27 or 28 days, and last long for 4 days or sometimes 3 days. Can anyone pls help me abt my ovulation date. We are trying for baby since last 1 Yr but Im not getting conceive can any one suggest me any specific position to conceive. I’m really desperate for a baby, pls help me

    Reply
    1. Clepetark

      Hi , for irregular cycle it is still pretty simple. The day 1 if your period is the day 1 of your cycle, your fertile window is between day 10 and 17. During this period have intercourse only one day one 2, to allow more mature spermatozoids to be released. As they live 3 days in the womb, there will be always some up there to wait the ovulation to happen.

      Good luck and .. relax ! let the nature go !

      Reply
  5. kaylah thompson

    Hi I had my period on the 24/10 so my next period was due yesterday and I didn’t get it but test is showing negative.

    Reply
  6. Ama

    I had my menses on the 1st and had unprotected sex on the 10th can i get pregnant?

    Reply
  7. kike

    My last period was 28th of November and I started having sex since 4th of December till 22nd of December,i want to know if am pregnant.

    Reply
  8. Vivian

    hi I’m 23 married. His is service. We’ve been trying to get pregnant for a few months now. Last month I got my period dec 6-9. He came home the 19 last month. And ever since then we’ve been having sex. And I am bleeding now. My question is why I didn’t get pregnant?

    Reply
    1. Clepetark

      hi , conceiving take some time, more for some, less for others. You have to concentrate yourself on your fertile window, which start 10 days after the day 1 of your period and end day 17, within this week you need to have intercourse one day on 2 … not everyday, to allow more mature spermatozoids to be released.

      Good Luck

      Reply
  9. MinaK

    Hi! My last period started on December 27th and it lasted for 5 days. I had sex with my husband somewhere between January 10th-January 20th. Today’s date is February 2nd and I still haven’t gotten my period. Yesterday I did a home pregnancy test but it was negative (however, I did do it in the afternoon. .). Is it still possible that I am pregnant? Oh, and I should mention that we have some problems during intercourse (he can’t go all the way in because it hurts me too much and so my hymen could still possibly be intact). So..could I be pregnant?

    Reply
    1. Clepetark

      Hi,

      you should to test yourself with the fisrt morning urine, it is the one having the most HCG concentration, the hormone the test is looking for. Also if you have regular intercourse, I have big doubt that your hymen is still intact… some little girl rupture it just by doing bicycle … it is pretty fragile ! having difficulty penetrating might resulting from another issue and this should be addressed to your physician

      Good luck

      Reply
  10. why

    Hi I’m worried about my situation please help to clear my mind:
    Here’s my situation:
    I have PCOS so my doctor put me on contraceptic pills( yazmin),
    I just started to take end of December 28 2014,
    Period start Dec.28- January 22 2015,
    But it’s February 4 now and I’m taking the second pack of the pills but I didn’t have my period until now,what should I do? I’m so worried,went for blood test to sure that I’m not pregy comes neg.
    Please give me some advice thanks in advance.

    Reply
    1. Clepetark

      Hi,

      when you starts a new birth control pill your body need up to 3-4 cycles before getting use to it. Also when you change brand of pills it is recommended for 14 days to use condoms as the pill could not be completely effective yet.

      Good luck

      Reply
  11. adE

    Hi, have bin trying to conceive for sometime now but without success cos my period isn’t regular for instance I had my period on the 5th of dec then again on the 30th of dec, then by 30th of Jan my hope was raised but disappointed I saw my period on the 1st of FEB but the unusual thing is have been craving for sex since it started. Pls what do u think is the problem. Thnx 4 your help.

    Reply
    1. Clepetark

      Hi , hormones level is changing and having craving while having your period is not unusual, having sex while having your period is not dangerous either, you just need a very open minded partner … and of course a will to try it on in the shower maybe ! As of conception the rule is pretty simple for random cycles. Your cycle start with your period, call it day 1. your fertile window is between day 10 to 17 to make it wide. Have intercourse one day on 2, not more … during this window, that will allow more mature spermatozoids to be released so you will increase your chances of success.

      Good luck

      Reply
  12. precious

    I have been trying to conceive in the past 3 years now but to no avail. My period is irregular at times is 22 days,26 17. Am really worried. Jan.2015, it started on 6th. It also came out on 27th Jan 2015. Based on this, I can’t pinpoint my ovulation days. Pls I need your help

    Reply
    1. Clepetark

      Hi,

      to pinpoint your fertility window with an irregular cycle is not to difficult. The main rule is quite simple. The first day of your cycle is the day 1 of your period. Your fertile window as you seem to have a short cycle will be day to day 17 to be very wide and not to miss it. The best way to conceive, is to have intercourse one day on two.. not more, this will allow more mature spermatozoids to be release, so it will increase your chances of success. The spermatozoid is living 3 days in the womb on his own nutriment reserve… so there will be always a few waiting for the egg ! After 3 years trying … I guess that both of you had a fertility screening to make sure that you can both conceive ? if not i strongly recommend you to do so.

      Good luck

      Reply
  13. neol

    Hi…I had my menses on the 11 of February and it ended on the 17th of February. I had sex on the 18th. Without protection. My partner said he didn’t release any sperms in me thus he came out of me. But I’m a bit worried. Can I be pregnant

    Reply
    1. Jane

      withdrawal method is not reliable and you’re taking a lot of risk if that’s your only way of protection. you had intercourse early in your cycle so the change of becoming pregnant is low, however there’s still a chance

      Reply
  14. renney

    I had a miscarriage in December. My menses were okay in jan from the 7th to the11th of feb but as we speak today the 22nd ,am having lower abdominal pain and a slight backache but without bleeding. Pls help

    Reply
    1. Clepetark

      Hi , I dont know if you tryed to conceive already but it is recommandded to wait 3 cycle before doing so to help your body to balance back the hormones before getting in the roller coaster again ! Your pharmacist can give you good information about your symptoms and will recommend you either to test yourself or to visit your physician.

      Good luck

      Reply
  15. mike hamson

    pls help me. my fiance just finish her menstruation on the 22nd feb. pls i want to know when the likely date will fall to in june. we are planing our wedding for june and we dont want the menstruation to fall within the day. pls help calculate the menstruation day for the month of June. thanks

    Reply
    1. Clepetark

      first thing to know is if her cycle is regular if yes, i invite you to use the period calendar on this site, if not there is nothing you can do to calculate it.

      Good luck

      Reply
  16. Elle

    Hi,
    My last period was on The 7th of Feb, I should have my next period on 5th of this month, but I still don’t have my period yet. I tested myself and it’s negative. Is there a possibility that I’m prenant or is my period delayed?

    Reply
  17. nina

    Hi. My menses was on the 12th of febuary and I had sex on the 20th of febuary. Can I get pregnant and wen is my next period. I have a 29 and 30days cycle which swaps sometimes after every two months bt it’s regular. However the last one was 30days

    Reply
    1. Clepetark

      hi,
      the first day of your period is the day 1 of your cycle, your fertile window is between day 11 to 17 depending of the lengh of your cycle . On feb 20 th , it was a way to early to get pregnant. Check on this site, there is a good tool to use, to calculate your cycles.

      Good luck

      Reply
  18. whit135

    I had my last cycle on feb 11 2015. And have not had my cycle yet for march i be feeling sick in the morning time i bearly have an appetite now could i be pregnant.

    Reply
    1. Mary

      If you have a morning sickness that can be a sign of a pregnancy, but you have to be more sure than that.
      Please consult your doctor about this, a specialist is the only one who can advise you properly.
      Some obstetric diseases have pretty much the similar symptoms, if your symptoms include high temperature- urge yourself to visit your doctor as soon as possible.

      Reply

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