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.

221 thoughts on “How to Use Period Calculator

  1. Jessica

    Hi I had my period on july 31st. And haven’t got it since. I have been having unprotected sex since then. I had a blood pregnancy test and it was negative. Can I still be pregnant?

    Reply
    1. Jane Post author

      Blood test doesn’t lie. If there was no HCG tracked in your blood, there is no pregnancy ongoing. Keep trying !
      Good luck

      Reply
  2. ruth osuma

    Hi. Doc my problem is irregular period it does’t come when is suppose to come and when the period come it flow for 2 days have done all kind of hormonal profile am ok scan to am ok so I don’t no what to do next thank u.

    Reply
    1. Jane Post author

      Some women will have irregular cycle all their life and that is not putting your health at any risk, as of the inconvenience I agree that it is easier with predictable periods. To help you in that mater, your physician can maybe propose you a birth control pill, that will stabilize your hormone levels and trigger the period on time.
      Good luck

      Reply
  3. kira

    If i had unprotected sex July 10th but my period came on July 15th but didn’t come on in the month of August just spotting can i be pregnant? If so how many weeks? It is now Sept 10th and im waiting to see if i will have a period

    Reply
    1. Jane Post author

      Hi, having unprotected intercourse 5 days before period, it is far after the fertility window, the odds that you are pregnant are very thin, but life is always reserving us some surprises. Skipping the cycle is quite possible as well for many reason such as stress, a new diet or a gym routine. Test yourself and you will know once for good if you are expecting or not. To track the date of the beginning of the pregnancy it will be simple – it will be the day 1 of the period that occurred in June.
      Good luck

      Reply
  4. Emma

    My period started last August 18 or 19 and ended sometime before August 24. We had unprotected sex on August 29 and he came into me. I’ve been experiencing slight headache, extreme mood swings and exhaustion, idiot know if I’m just imagining that my breasts increased somehow and sometimes hurt. Though some day it’s too early to tell. What can you say about this? Thank you! :)

    Reply
    1. Clepetark

      Hi , depending of the length of your cycle, if it is regular or not it is possible to be pregnant, but you might just listen too much to your body also ! The only way to confirm if you are pregnant will be to test yourself if your next period are delaying.

      Good luck

      Reply
  5. Shakita Green

    My menstrual cycle came around on August 13th and ended on the 17th. Me and bf had sex around the last part of August. My next period was due three days ago and it haven’t shown up. Yet the tests, I took three of them, showed up negative. Could it be a possibility that I might be pregnant?

    Reply
    1. Clepetark

      Hi , a test will show positive 14 days after the last day of the last unprotected intercourse as the body need some time to build up enough HCG concentration to trigger the test.

      Good luck

      Reply
  6. joan

    my period was on the 7 August, had unprotected sex on the 26 Aug even though my partner said he didn’t cum, later noticed bleeding for two days on the 2nd Sep after having sex, i feel bloated, back ache, unsettled stomach.Can i be pregnant?

    Reply
    1. Clepetark

      Hi , cumung or not, precum can contain spermatozoids … the only way to confirm if you are pregnant or not will be to test yourself as soon your period get late !

      Good luck

      Reply
  7. Love

    Hi, I will be 40 next month. I had my tubes tied 12 years ago and had an Endo ablation 2 years ago. My periods have always been on time and on a 28 day cycle. I am currently 4 days late. I took a HPT and it was neg, and I called the nurse which instructed me to wait 2 weeks and take another one. I’ve heard of women getting pregnant after these procedures. What do you think?

    Reply
    1. Clepetark

      Hi ,

      when you had tube tight, and have them reconnected you have to know that for each year the procedure was done, you decrease by 10% the chance of success. By example if the tubes were tight for 8 years… you have 80% chances that it will not work. In your case 12 years … it is a long time … statistic never confirm a complete negative chance of getting pregnant but they are negligent… Clock is ticking for you while your body can still carry a healthy pregnancy why not having in vitro procedure done with your ovary and his sperms … to grow in your womb to skip the need of the tubes ?

      Reply
  8. bless

    I saw my mens on the 2nd of september, and I had sex on the 15th will I get pregnant?

    Reply
    1. Clepetark

      Hi , getting pregnant from an intercourse on the 15 th is possible as, it is in your fertility window !

      Good luck

      Reply
  9. glaiza vargas

    I had my period on august 25 2014 but my period came as early as sept 16 2014 why it is came early im always regular in that date or late 2 days or realy 2 days it is normal it is posible for being pregnant

    Reply
  10. Halima

    Hi my last period starts on 15 and ended on 20 and i had unprotected sex on the 7,8,9,10,11,12,13,14, and 15 and have not see my period.and i had sore breast and i feel reluctant to wake up in the morning does this means that I am pregnant?

    Reply
    1. Clepetark

      Hi, Being pregnant is quite possible on the first few days of unprotected sex you had as they were in your fertility window. Test yourself as soon you get late !

      Good luck

      Reply
  11. manju

    I saw my period on the 25th of august and it ended on the 28th of august, I had sex with my bf on the 17Th September can I possibly get pregnant?

    Reply
    1. Clepetark

      Hi, depending of the length of your cycle it is quite possible test yourself when you will get late for your next period !

      Good luck

      Reply
  12. vicky williams

    hi, i took the the test as nature has surprises for us and it came out positive on the 26th of September, yes im pregnant and im so excited……… thanks

    Reply

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