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, 3.5 out of 5 based on 62 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
  • sasha

    My period started the 18th of october finish 4 days later. Had sex on the 31stmy bf ejaculates inside me what are my chances of getting pregnant?

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  • Jessie

    My last period was November 11th an I took 3 test. They were negative what should I do

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  • Muhammad Bilal

    Hey , My question is very simple …is it possible to intercourse just after or just before a period and to become a pregnant.?..Without ovulation days it is possible to become pregnant?

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    Rating: 2.0/5 (1 vote cast)
  • Labu Me

    Good day, i have a concern regarding my ovulation. My 1st day of menstruation was december 2 2016, we had intercourse the mid of the month,it was december 16. Is there a possibility to get pregnant.? My cycle is 30 days. Looking forward for response.

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