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, 3.6 out of 5 based on 37 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

Related posts:

  1. Ovulation Predictor Kits (OPK)
  2. When Do You Ovulate? 6 Easy Steps
  3. Pills To Get Pregnant: 6 Fertility Pills That Work
  4. How to Use an OPK
  5. Pinpointing Fertile Days: 6 Ways to Know
  • recho jordan

    I gave birth last 2013 0n 24 june and I stared my periods after seven months from February 25th has been my first day up to 28th, I have been having sex with my boy friend and last month I started my periods on 26th and not heavy periods as always and it was in beat by beat and just for two days, could it be that am pregnant? and I had sex on 10th august.

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  • shantel

    Hi everybody, I have been trying to conceive for abt a year now but its not hapening. I have had blood test and scan and everything is fine, my partner has had semen tested he is also fine but we still cant get pregnant.i think am not getting my ovultion correct. Pls I need help, am on 26 days cycle, my period just started on 20/11/2014 pls help me calculate my ovultion thanks.

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  • jess

    hi, so i was 10days late for my period (I am never late) maybe by 2 to 4 days. My period finally stared on the 25th Nov.! It stared very light then gone heavier, we are trying to conceive and had been using my ovulation predictor app. My fertility window was 27th oct to 2nd nov.
    so my question is when would my next fertility window be?

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  • LucyLu

    Ever since I got married back in May I haven’t had my menstrual cycle, and I just thought maybe I was becoming irregular. Now my husband and I are trying to convince but it doesn’t seem to be working. Could something be wrong with me?

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  • Brittany clark

    What if I miss my “most fertile” days by 3 days. Do my chances significantly decrease of being pregnant?

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  • Bre Whatsgood Sila

    I have a. January the 8 to January the 11th so trying to find out when am i ovulating what date

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  • Ella

    I had my lmp on the 1st of july had sex on the 4th and had sex again that month on the 19th , i have a 34 day cycle and my due date is 7th april. I got conceived on the 19th or possible on the 4th?

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  • udouamaka chinyere

    I need pills to conceive twins boys

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  • norms

    hi can you help me please,,, this is the story begin,,,, we had our sex dec20-21,,,, is it posible that her duedate was September 10? I wish you could help thanks

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  • dimenut

    Hello I took clomid last month I started my period on 01/28/2015 and took clomid on cd 3-7, I did not get a positive lh surge, but I only tested 1x per day for 7 days so im not sure if I even ovulated, on 2/22/ I started spotting and it continues to this day which is 2/24. My question is…should I take my clomid or wait for a regular flow?

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  • nelly

    I am trying to get pregnant I need help with is my ovalation I had my period february on 22 and it stop on 25th it 4 day long when is my ovalatin day please help

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  • Morgan

    My boyfriend and I had sex March 1st and I ovulated March 3rd what are my chances of being pregnant??

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  • jessica

    Hi. I started my period February 16. I had it until february 19. I started again March 12. I had it until March 15. I had sex March 17. My cycle is 24 days. Can I be pregnant since I’m supposed to ovulate today or tomorrow?

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