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.

266 thoughts on “How to Use Period Calculator

  1. candi

    Hi,
    I got my period August 6th and then again August 26th. So far i havent gotten a period for September. Could i be pregnant, because im not on birth control and i haven’t been stressing?

    Reply
    1. Clepetark

      Hi, do you have a regular or irregular cycle ? it is normal for a women to have 21 to 32 days cycle and to get some changes once in a while stress is not the only reason to skip or change the regularity of your cycle, new diet or gym routine ca be as well ! As of being pregnant, there is only one way to know ! test yourself 14 days after the last day you had intercourse, that is the time the body need to build up enough HCG hormone to trigger a positive test !

      Good luck

      Reply
  2. Kathy

    hi I had my menses on August 14th

    ended 18 I had unprotected sex on September 1 am I pregnant since my menses is delayed

    Reply
  3. sandra

    Hello doc,I have unprotected sex with my man a day before my ovulation which is on 10th sept and also on my ovulation start day 11th sept and 12th sept repeatedly .can i get pregnant and when should I be confirm pregnant.

    Reply
    1. Clepetark

      Hi, you are doing it all right , to have intercourse prior the ovulation ! spermatozoids are living 72 hours in the womb, they will be there to attend the big arrival of the egg! Then to keep a constant flow of mature spermatozoids fellow , one day on 2 is recommended for the rest of the fertility window. Test yourself as soon you are late in your period !

      Good luck

      Reply
  4. stella

    i was 7 weeks and 2days pregnant on 9th of september 2014:My expected conception date is 26 of April next year. What was my last ovulation date.

    Reply
  5. naej

    good day! Doc, i got my period last August 19 and ended last Aug. 22 and we had unprotected sex with my partner last Sept. 4 which is my ovulation date. I was supposed to have my menstruation this Sept 16 but my mens doesnt come.. I feel dizziness, back pains headaches and exhausted eventhough i didnt do something tiring. I took a pregnancy test last Sept. 17 and it shows Negative… Am i pregnant?? pls help… Do i need to take a test again? When is the exact date to take a test again? Thank you..

    Reply
    1. Clepetark

      Hi , you tested yourself a bit early .. as after conception the body need 14 days to built enough HCG hormones to trigger a positive test. Please test yourself again and use the morning urine as this one will be the one containing the highest concentration of the hormone

      Good luck

      Reply
  6. Raine

    Hi Doc, i had unprotected sex last September 10, 2014.. and i was expecting my period last September 21,2014 and yet i don’t have my period until now. I’m a pregnant?

    Reply
    1. Clepetark

      Hi , might be if you had unprotected sex or if you had issue with y our protection , now that you know for sure that you delay, test yourself ! In any case that you worry not having your period please have a talk with your physician that mignt be able to give you some answers !

      Good luck

      Reply
  7. Twilla Gabbert

    Hello quick question …my cycle is usually 28-30 days now August I had my period from August 24-September 11 very unusual for me.. .now the question is when could I expect my next period?

    Reply
    1. Clepetark

      Hi , that is the million dollar question, if your cycle became irregular, as the name says it … it will be random. It can happen once in a while that one cycle is not sync with the other I would not worry about that, if it keep being irregular there is solution that you can discuss with your physician as taking birth control pill, that will regularize back your cycle.

      Good luck !

      Reply
  8. Jane

    Hello! My period came on August 20-25, I had unprotected sex September 2. Now my period came on September 18, and went completely off on the 20th. I took 2 cheap test on the 20 and it came out Neg. Is there still a chance I might be pregnant, if so when should I so another test??? If not Woot Woot!! Answers please?!!!!??!??

    Reply
    1. Clepetark

      Hi , sept 2 nd was early in your cycle, don’t think that your tests lied to you ! You will know more if your next period are delaying. But if you are not trying to conceive… please have responsible sex.

      Reply
  9. Retshedisitswe

    my period is 5 days early! is there something wrong with me?! my last period was on 30 July, and 30 August and my cycle was 31 days! and now i got my period on 25th September!

    Reply
  10. jenny

    my cycle is usually 28-31 days , but this month of september it went up to 36 days its very unusual for me.. .now the question is when could I expect my next period?

    Reply
    1. Clepetark

      Hi , Your next period will occur either according to your new cycle or the previous one or even in between … when an irregular cycle occur it can be only a one shot deal or a new status … either way if you feel uncomfortable about this new situation, please don’t hesitate to discuss the issue with your physician, he will have more answers for you !

      Good luck !

      Reply
  11. kay

    Hi.my menstrual periods are irregular and usually ranges from 24 to 30 days. How should i determine my fertile days

    Reply
    1. Clepetark

      Hi , the fertile window of any cycle is between the 10 to 14 th day starting on the first day of your period. I recommend you to have unprotected sex one day one 2 from the day 8 to 14 just to be sure you cover well the entire period and have as much mature spermatozoids as possible.

      Good luck

      Reply
  12. chelsea

    hello. my last menstrual period was august 26, we had an intercourse a week after my period . im expecting to have my period last september 25 but im delayed for a week now. how many percent of chances for me to conceive? is it necessary for me to do the test now?

    Reply
    1. Clepetark

      Hi,
      odds are very minimal as it was a way too early into a normal cycle to conceive… but nature taught us that nothing is impossible, in the case by example of women having 2 distinct ovulations in the same month… A lot of factor in our lives can delay the periods to starts such as stress, new job, sleeping disorder or even a new gym routine. The only way to get a straight answer on are you pregnant or not will be to test yourself. the pee on a stick test need 14 days after the unprotected intercourse to trigger positive, earlier than that you might have a false negative.

      Good luck !

      Reply
  13. edaj

    Hello.i just want to ask something. I had my last mentruation last aug.30 ended sept.4. I had unprotected sex with my husband sept.6,8,10,and 13. Sept.27,2014 i had my period again. 27 was the first day and it ended sept.30. Its not so heavy.unlike my past mens.I dont know what is my cycle. What i knew is i always having my period every month.its just a strange feeling coz i keep throwing up this past few days.and always feel tired. A bit headache either and cant eat so much..i always feel full.. could i possibly pregnant? Hope to get answer soon.thanks.

    Reply
    1. Clepetark

      Hi , being pregnant is possible effectively as some women will experience period like bleeding during the first trimester ! test yourself to clear it out !

      Good luck

      Reply
  14. Charity

    my boyfriend fixed a condom on his penis and began
    teasing my vaginal after ejaculation (the condom didn’t burst)I also took postinor
    as double protection pls I want to know If I will get
    pregnant ?

    Reply
    1. Clepetark

      Hi , The chances a minimal but there is always a risk after ejaculation there is still spermatozoids in the urinal tray … but they have to make their way up to the tube … while you are into your fertile window … it is almost voodoo magic but possible ! having sexual contact of all kind with no protection always lead to a risk of conception, if it is not planned in a short future for you guys … be safe and protect yourself at all time

      Good luck

      Reply
  15. Shaz

    Hi. I gave birth to my first baby on the 3rd June 2014. I had unprotected sex with my husband I think somewhere on the 18th July 2014. After a month, I was tested positive for pregnancy. I will like to know how do I calculate the due date. Thanks.

    Reply
  16. Nikki Cole

    I had my period September 11 and came off on the 17th. I had unprotected sex September 26 into the 27th. Is there a possibility that I could be pregnant?

    Reply
    1. Clepetark

      Hi , depending of the lengh of your cycle, yes it is possible, shorter your cycle is more change you had to be in your fertility window !

      Good luck

      Reply
  17. hoping/mirracle

    Hi Im irregular, and had my periods last September 7 to 14 and not heavy bleeding,I had contact with my husband September 18,21,29,and October 5,9,12, but until now no period and I never had experience a lots of pimples intomy face and is so look disgusting,my question is, is it theres a possibility that I’m pregnant? And is it pimples a sign of pregnancy?
    Thanks…..

    Reply
    1. Clepetark

      Hi , Being pregnant is … being once again on growing hormones .. like your teenage age , so yes, pimples is possible, as stopping to loose hairs and growing a shoe size ! Please ! test yourself with the dates provided regular or not you hitted in your fertile window !

      Good luck

      Reply
  18. shan

    I had unprotected sex with my boyfriend from the 16th of august until 25th..my last period was august 10th…my period did not come but sept 16-18th I had light bleeding very light…now today its light again but on and off am I pregnant

    Reply
    1. Clepetark

      Hi , everything is possible with unprotected sex ! Life is often finding its way, some women experience bleeding like period for the first trimester! Test yourself ! I think you deserve to know, what is going on and to have the option to visit your physician if the result is negative to have some answers !

      Good luck

      Reply
  19. mimixoxo

    HI, i usually have a very normal period my cycle is every 28 days 7 days . I’m four days late i took a pregnancy test the first one came out positive, but it was after a couple hours that the result came up positive. Then I took two more and they both came out negative. Am I or Am I not pregnant ? Should I get blood work to make sure that I’m not pregnant ?

    Reply
    1. Clepetark

      Hi , the best way to have success on pee on the stick test is to use the morning urine, as it contain more HCG the pregnancy hormone that the test is looking for. Also taking some medication can lead to false result… Blood test is not lying, if you are still late and have a negative result again I strongly recommend you to have a blood screening.

      Good luck

      Reply
    1. Clepetark

      Hi , Indeed the ovulation period can be track even with an irregular cycle. The first day of your periods are the day 1 of your cycle. Ovulation window is between day 10 to 17 , during this period, have intimate moment one day one 2 not more … to allow more mature spermatozoids to be released, as they live 72h in the wombs be confident that there is always be some there ready to welcome the egg !

      Good luck !

      Reply
  20. dorcas

    i did my menstrual period 20 and i had sex on 30 of the same month can i be pregnant?

    Reply
  21. amber horn

    its day 2 of my period and i still have not started yet. my husband and i did have sex and my fertile day, i just wondering could i be pregnant.

    Reply
  22. TC

    Ok I had my period on Sept 16th this yr my cycles are usually 30-31 and had sex w my husband on sept 28,29 and 30th also Oct 5th. I was suppose to start on Oct 16th and I’m now 3 days late. I have had mood swings, lower back pains, heartburn and dizziness but I got 2 negatives on a hpt could I be pregnant?

    Reply

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