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Ovulation Calculator: Free Fertility Calculator

on Jun 10, 2012

by Lucy Eades

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Not only can an ovulation calculator predict your most fertile days, but it can also predict your new baby's birthday. How cool is that!?

Now an ovulation calculator is basically, exactly what it sounds like. It calculates ovulation for you, thus, taking out all the hard work.

When do you ovulate?

So, typically, a textbook cycle is 28 days, and you subtract back about 14 days, to show that you ovulate on cycle day 14. Women will ovulate once per monthly cycle, roughly mid-way through their cycle. Knowing when you ovulate is a key component in getting pregnant fast, as your fertile window is only a few days surrounding your ovulation date. Even if you have intercourse all throughout the month, if you miss these few days around the day you ovulate, you will never fall pregnant. Claim Your 20 Free Pregnancy Tests – Click Here

Not every woman has a luteal phase of 14 days – luteal phase being from the time of ovulation to the start of your next cycle. The luteal phase can range anywhere from 12-16 days. I personally have a longer one. My average is sixteen days. So I would subtract sixteen days from the last day of my cycle, rather than the average 14 days. Now, if all of this sounds like more trouble than you really want to go through, then you want to try the ovulation calculator.

Here is how it works

It is really quite simple. There are only two things that you need to have. You need to know the first day of your last period, which mine was June 6, and then you need to know your average cycle length. Now mine is 31 days. This would be the average length from Day 1 of your period until your next period begins. For the average woman, this would be 28 days. Average cycle length can vary though, and range from 25-41 days or so. Take a look at your calendar and note how long your average cycle is. So when I go to plug in this information, it tells me what my fertile days are, and if I conceive, what my due date would be. Now my fertile days would be June 20 through June 25 resulting in a possible baby birthday of next year at or around March the 16th. A possible St. Patrick’s Day baby!

Guess your due date!

Now remember, this is just an estimate of your fertile days and just an estimate of the due date if you had conceived that month. So it really helps in not only helping you find out your fertile days, and knowing when intercourse could result in a pregnancy, but also if you’re wanting to plan your baby’s birthday in a specific month, this could help you with that as well. However, keep in mind, it’s an estimate and even if you did conceive, or somebody in my position conceived this cycle, and end up with a March due date, the baby still could come in February or April because some babies really like to pick their own birthdays coming early or late. All three of mine personally came three weeks early.

So that’s all you need. First day of your last period and then your average cycle length. Have fun!

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Ovulation Calculator: Free Fertility Calculator, 4.0 out of 5 based on 27 ratings

Lucy is a mother of three, who’s passionate about all things AP parenting. When she’s not busy giving tips on keeping babies healthy & happy, you can find her blogging on her popular YouTube channel

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  • hari

    i have an unprotected sex with my girl friend 4 days before her periods,can she be pregnant,if yes then how can i stop it,should she has to take i-pil every day

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  • ms pretty girl

    hi my name is sherrell i have a question about my preiod this month on the 18 and i have for 6 days and do i try for a baby on the 29 to the oct 4 but thing i wanna wait until my next period is the 13 or 12 of oct my period come every 28 days and have for 6 days can you please help me when i do ovulate and the calendar said i ovulate on the 4 of octorber and i know i have be having hot flashes and i crave sweets when i ovulate and my head dose hurt thought that time and salty food i see dischange like a egg white in my underwears when i wipe those can be the sgins of ovuation

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  • kay

    my cycles range from 28 to 33 days usually, with the occasional 38 day one. My husband and I are TTC for about 4 months and even with a fertile calendar we keep missing our “fertile days” due to the randomness of my cycle. Is there anything we can do to try to get better accuracy of when we ovulate?
    Thank You.

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  • Monica Scott, RN

    Yes, you may try having sex at least every other day to
    ensure your ovulation days are covered as sperm can survive inside the body for
    about 72 hrs. It would also help if you lie down flat or elevate your hips
    after intercourse for at least 15 minutes to prevent sperm from leaking out.
    Also, a visit to your doctor is recommended before trying to get pregnant.

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  • jlc

    I’m pregnant and trying to figure out how far along I am. My last period was September 2 but it was late and only a day long which is not normal for me. Do I use that as my period date or do I use the one before?

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  • juju

    do I have to be on my period to take the fertility pills

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  • TWilliams

    We’ve been trying to get pregnant for about 2 years with no luck. My menstrual is sometimes regular but sometimes it’ll be late a couple weeks making me believe im pregnant but that’s never the case because it’ll eventually come on. What should I do? What’s wrong with my body? My last baby was preterm labor. My water broke at 24wks gestational and she was held inside for as long as the could. then at 28wks i was induced. Could that be a reason why Im having trouble getting pregnant now? Please help

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  • Maureen Stephens, RN

    You may begin taking ConceiveEasy® right away at anytime during your cycle, taking one tablet daily with meals. And to ensure a healthy pregnancy, we recommend you see your doctor for a pre-conception visit when you’re ready to begin trying to get pregnant.

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  • gloria

    pls i need ur help i need a boy

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  • mehmil

    I have baby girl. Now I want baby boy please help me about boy diet and and give me tips to conceive baby boy.

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  • Dr. Christine Lee, MD

    There are no guaranteed ways to conceive a baby boy but there lots of ways you can try. Baby boy sperms thrive in alkaline environment so it is best to eat alkaline foods and ones rich in magnesium like red meats, beans, oats, eggs, sweet corn and zucchini. It is important to eat throughout the day as studies show that higher energy intake and higher glucose levels can be linked to the conception of boys.

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  • chinakie

    THEY SAID A NORMARL PERIOD IS 3-5DAYS BUT MY PERIOD IT COMES FOR 7 DAYS,WHATS WRONG WITH ME THEN,AND SOME TYMS MY PERIOD COME EARLY LIKE LAST MONTHS MY PERIOD CAME ON THE 10 OCT AND ON THE NOVEMBER CAME ON THE 4 IS THE ANY PROBLEM?

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  • danette

    i had a baby 5 years ago and i have been without birth control for 6 years. i just recently 2 and 1/2 months ago just got out of prison so basically i haven’t had intercourse for 5 years with a man how can i get pregnant again we are trying?

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  • danette

    my friend wants to know how you can have a baby when it is really hard for her to get pregnant she already has a 3 year old little girl?

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  • caro

    started my periods on 2 of Nov 2013 they stopped on 5 Nov had unprotected sex on 29 and 30 nov can iget pregnant

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  • Onell

    I was on family planning taking pills for almost four years and stopped taking it for three years. Is there chances of getting pregnant again.. My only daughter is 8 yrs old now.. Please advice what i should do to get pregnant again. Onell

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  • Kristen

    my last period was in mid September. My period is irregular since I got off my birth control in April. Is there anything i can due to make me have a period, or ovulate?

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  • barbie23

    How often should I have sex to get pregnant my period comes every 21 days my last one was December 1 and it lasts for 7 days?

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  • lovely

    Hey my name is lovely I had got my period on the 18of Dec it went off on the 22 of Dec me n my husband had sex on the 27,28.could I be pregnant. Or when should I take a text please I don’t no.

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  • love

    ihav my period on dec.27 2013 and it last dec.29 2013..on jan 2 2014 i got intercourse with my husband ….can i easily be pregnant??

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  • love

    my period last dec29 2013…….and i got intercourse with my husband in jan 2 2014..can i easily be pregnant??but im taking my pills on the last day of my period which is dec 29 2013..pls reply

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  • love

    plz reply now

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  • veta borke

    I have an irregular menstrual cycle, I don’t see my period for about 2-3months some times and other times it comes monthly, my cycle is just scattered! I want to use the ovulation calculator but because of my irregular periods I find it hard to calculate my average cycle length. Please what do you advice me to do ? Thanks.

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  • Holly Stauffer Bailey

    My periods are 3 months apart What should I do to regulate my periods so I can start counting? I’ve heard Cod Liver oil will help regulate, is that true?

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  • Tabitha

    Hi me and my husband are trying to. Get pregnant again I started my period on January 21,2014 my cycle day is 28 days long and my lutheal phase is 14 so when will I ovulate I’m hoping this month I will get successful I have had false postivies and it drives me crazy please HELP!

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  • Tashawna Ackles

    I want to get pregnant asap

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  • Tashawna Ackles

    I’ve had a miscarriage bk in feb 2010 and we been trying but can’t seem to get there but I came on my period January 19, 2014 and I’m trying to see when I ovulate.

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  • Joan

    What pill can i take since i have irregular menstration?

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  • pat

    my last period was on the 20/1/14 and i had unprotected sex on 1/2/14 . around 22/2/14 i felt pains and den the flow but lasted only for a day. had to go for PT and i have been informed that its positivfe . what do i do.

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  • jess

    I have had bleeding during my ovulation period is it ok to still have sex as me and my.fiance.are planning to have a baby
    Thank you

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  • Eva

    Ive been trying to get pregnant since I got married six months ago. I haven’t had any luck yet does this mean somethings wrong

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