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.

131 thoughts on “How to Use Period Calculator

  1. patient

    My period was June 15, after 5 days we had sex, now I am getting back pain stomach pain and also am very tired. Are these the symptoms of pregnancy

    Reply
    1. Clepetark

      Hi ,

      This is a way to early in your cycle, but some women are experiencing multiple ovulation during their cycle. if you are worried better for you to do a pee on the stick test on day 21 of your cycle, starting to count on day one of your last period. Sometime the guilt feeling of unprotected sex, is making you listening to much to your body and can trigger pregnancy like symptoms. The best way to clear your mind out and avoid delays on your next cycle out of stress is to test yourself.
      Good luck

      Reply
  2. victoria

    Hi I had my last period on April 15, 2014. In the month of may didn’t get anything. In the month of June made a doctors appointment so I went on the 6 of june. Did blood and urine both negative. In the 6 I was spotting the doctor check me out all I needed was a panty liner. It was so light son it lasted from the 6 to the 13. Now my calendar is tell me that today the 28 of june I’m suppose to be getting my period. But no sign of it. I am always regular with my period my whole life. Even with stress believe me I get it earlier but it always shows every month. Now I am just waiting to see what’s going to happen. I am 41 very healthy doc said no menopause pad came back normal. So nothing else is wrong with me. When I was pregnant with my two oldest I didn’t know till I was three months. So can anyone share some advice. Thank you ladies

    Reply
    1. Clepetark

      Hi ,

      hum, did you start a new fitness routine or being under a very big stress, change of career the grown up leaving home or graduating university. Menopause can be on and off before being completely engaged, you cam have random cycle before being full stop, but 41 is still young to be menopaused…. some lady turn at 25 but it is very rare. If you skip this cycle. Get a pee on the stick test at the drugstore… being o late if if it a pregnancy it will show, if not it will reinsure you. But the blood screening doesn’t lie … it is jute to make sure you did not get pregnant since … the blood screening.

      good luck

      Reply
  3. Joy

    I have a very irregular cycle, I saw my period on the 28th of January, didn’t see it again until March 22nd, then may 18th and now July 3rd. Am not having sex either. Please, what could possibly be responsible and what can I do to get it back to normal. Thanks!

    Reply
    1. Clepetark

      Hi,
      having an irregular cycle is more common that you think but you seems to skipp always a month, there is multiple possible explanation, from just having a long cycle to having only one ovary that function. A medical visit could give you more answers. Extreme sport, stress and very busy lifestyle can also result in skipping cycles, but i don’t think it is why you skip months as it seems to be on your case a long term issue. Birth control pill can force your cycle to settle. Again a medical visit might help you to understand better your cycles. This is nothing urgent, no need to rush to the emergency room for that, but maybe during your next annual visit this should be addressed !

      good luck

      Reply
  4. jen

    Hi, my last period was on the 26th of may,ended on the 2nd of June.. im pretty sure i had the cervical mucus changes somewhere around the 11th of June not really sure for how long as i wasn’t particularly paying close attention,just noticed the changes after being to the toilet. My man an i had sex on the 18th of june..i didnt get my period on the 30th of june as expected so i took a test which was negative, i’m wondering did i test too early?? is there a chance i may be pregnant?? im still yet to see any signs of my period so am a little curious. thanks

    Reply
    1. Clepetark

      Hi,
      Is your cycle regular ? the 18 th was late in your fertility window but still possible… Just the stress of the possibility to be pregnant might delay them. If a pee on a stick result is negative and you still feel unsure a blood screening cannot lie !

      good luck

      Reply
  5. Kai

    Hi, im looking to shed some light on an issue i have going on right now and hopefully some one has gone thru something similar and can give me some advice. ok so here’s my situation: my periods are normaly regular so my last period was on june 5 til about the 9th or 10th. i had sex on the 17th and 19th. my period should have been due july 3rd but it is now july 12 and no af. i know its not stress because im very calm seeming how i was not trying to conceive in the first place. anyway ive been having light cramps and feeling a bit more tired lately. i no pregnancy is not the only reason for a late period but im wondering if i could be in fact pregnant. although this was not planned i dont want to get my hopes up to get dissapointed by a negative test. Should i take a test or give it a few more days?

    Reply
  6. Abby

    I randomly have irregular periods, my last period was june 13 2014, when do i expect to see my next period?

    Reply
    1. Clepetark

      Hi , as you are saying yourself … you have an irregular cycle …so they are unpredictable…. In order to regularise your cycle in order to have more predictable periods, taking birth control pill can help a lot !

      good luck

      Reply
  7. osmm

    Pls I had sex on 20th April 2014.My last period started 14th May.How long is my pregnancy from the day of sex(20th April)to 2nd July?

    Reply
    1. Clepetark

      you date of pregnancy will be the first day of the last period you had before you got pregnant. But if you had periods on may, you will not be pregnant from the april intercourse you had. Once you have a positive pregnancy test in your hand, if you are right now it will be your early july first period day that will be the day 1 of the pregnancy in the calendar.

      good luck

      Reply
  8. Kai

    Hi, im looking to shed some light on an issue i have going on right now and hopefully some one has gone thru something similar and can give me some advice. ok so here’s my situation: my periods are normaly regular so my last period was on june 5 til about the 9th or 10th. i had sex on the 17th and 19th. my period should have been due july 3rd but it is now july 17 and no af. i know its not stress because im very calm seeming how i was not trying to conceive in the first place. anyway ive been having light cramps and feeling a bit more tired lately. i no pregnancy is not the only reason for a late period but im wondering if i could be in fact pregnant. although this was not planned i dont want to get my hopes up to get dissapointed by a negative test. Should i take a test or give it a few more days?

    Reply
    1. Clepetark

      By now a pee on the stick test will give you a clear answer ! as you seems to be very late. It is possible that you just skip a cycle with no reason, or in response to a change in your life as you mentioned stress or starting a work out routine or quitting smoking … Don’t wait, do the test, so you can plan ahead what it is coming or to stop worrying if it is negative. you had intimacy very early in your cycle but it is not impossible depending of the length of your cycle.

      Good luck !

      Reply
  9. joice

    Hello, please i need you to put me through on this issue that have been giving me concern.my march period came on the 29th,April on the 24th,may on the 20th,june on the 14th and then july came 11th, and what i observe now is that,when the period will come, it will only last for 3 days i.e its dried up on the third day and am not comfortable about it. Please i want to know if my period is regular or not and what to do to correct it if its not regular. Also to know my chances of getting pregnant because i really want to get pregnant. Thanks..

    Reply
    1. Clepetark

      Hi , you seem to have a decent cycle. to get pregnant with a short or irregular cycle, the magic recipe is that you have to consider the first day of your period as the day 1 of your cycle. Your fertility window is day 11 to 17. For short cycle we can even push it to be day 9 to 17. During this window, and this is the most important thing … have intimacy only one day on two … to allow more mature spermatozoids to be released. As they live 72h in the womb. there will be always some in between the intercourses and the entire window will be covered as, you might know the egg can be fertilize only a few hour before degrading.

      Good luck

      Reply
  10. kehinde.kofoworola

    hi there,

    pls my period came on the 18th of june and ended on the 22nd. had unprotected sex on the 27th which make 5 days after my period. can i get pregnant that way? also this month of july my period is yet to come.

    Reply
  11. hoping/mirracle

    Hi there, I’m 25 married,trying to have a baby,my period is always late or should I say always change the date to start or finish but it’s always there in every month,I had my last period April 18 to 25,me and hubby r always had a contact,then June I don’t seen my period but I had a spotting first light brown then goes dark brown 3-4 days,I went to doctor for blood test it comes neg.and my progesterone is low,and now July I don’t have a period again,I done my ultrasound last year and there’s nothing wrong with it,any suggestions that may helps me? Thanks appreciate..

    Reply
    1. Clepetark

      Since how lng are you trying to conceive ? if it is more than a year maybe you should consider a visit into a fertility clinic to make sure nothing is wrong on you and him. Also for person like you that have an irregular cycle the fertility window is day 10 to 17 of your cycle. Day 1 being the first day of your period. During that window have intamate contact only one day on 2, to allow more mature spermatozoids to be released.

      Good luck !

      Reply
  12. AHMED RUKAYAT TEMITOPE

    My period is calculated 26 days before now is calculating 21 days. Please, I hope there will be no problem with me.

    Reply
    1. Clepetark

      There is no problem with you , periods are following your hormonal flow, you can be regular for years then turn irregular for some reasons , nothing being wrong. If you have worries plan to speak with your gynecologist at your next annual visit.

      Good luck

      Reply
  13. sachi

    hi,
    I gave birth to a baby boy, and got my first period just after he turns one year and one month. I am thinking of using SFM or calendar method of family planning, is it possible to start using it already or should I wait for more months.
    Thanks in advance.

    Reply
    1. Clepetark

      The calendr method is only 74 % accurate if you have a regular like a clock cycle. I you do not want to conceive again in a short lap of time I would recommend you to use another contraceptive method.

      Reply
  14. tthom

    I saw My period on 8 of july and I had sex on the 26 of july will I be pregnant ?

    Reply
  15. zara

    Hi I last had my period on the 28th of june. For this past week iv had 4 days of cramps like period pains. And now nausea and diarrhea( sorry tmi). Im worrieddddd. Me and dh had sex but we weren’t trying for a baby. Are these pregnancy symptoms or something serious? ?

    Reply
    1. Clepetark

      personally, i have all these symptoms to every period I have … unless you have a positive pregnancy test in hands …. Has you had your periods …. you should not be worried

      Reply
  16. purp

    My period came on the 25th of June then light spotting on 19th of July. what to think

    Reply

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