Free Ovulation Calculator – Trying To Conceive? Calculate Your Most Fertile Days

What is a free ovulation calculator and why is it useful? If you are trying to get pregnant and would like to be more accurate about the times in which you are fertile and are most likely to get pregnant?

Maybe you have a specific reason why you want to get pregnant, right? When my partner and I decided to have a baby, I wanted my baby to be born in a warm month with plenty of sunshine. We also wanted my baby to be born in April, the same month that my partner and I were born. It’s crazy, right? But it is possible if you know your ovulation window.

I know as well that many women have tried to get pregnant, month after month, and unfortunately they have not had success. It’s a shame, but is the truth. A free ovulation calculator can help.

Well, actually there may be several reasons why you want to get pregnant and even more, you may want to calculate exactly the month when your baby will be born, right?

Here we’ve provided a little help, a quick and fast free ovulation calculator. Keep in mind that it is only a tool to roughly calculate your ovulation period and your most likely fertile days. To get a more accurate estimate, monitor your ovulation schedule over multiple months, or use an ovulation predictor kit to get information about your biometrics that indicate your fertility level.

But before going further, read about what an expert (Dr. Edson Cano Gynecoogist, Obstetrician) says about ovulation:

There is a considerable variation in the sequence of a menstrual cycle to another, even in the same woman.

Based on “IN VITRO FERTILIZATION”, studies have been able to identify interesting features such as:

  • The peak of the luteinizing hormone (LH) tends to occur at approximately 3:00 am, starting between midnight and 8:00 am. This hormone is used to predict ovulation.
  • Ovulation occurs mainly in the morning during spring and especially in the evening in autumn and winter.
  • From July to February in the northern hemisphere, about 90% of women ovulate between 16:00 and 19:00 hours in spring, 50% of women ovulate between midnight and 11:00 hours.
  • Ovulation occurs more frequently (approximately 55% of time) in the right ovary compared with the left ovary.
  • The egg from an ovary only occurs in longer menstrual cycles, in women over 30 years and with decreased fertility.
  • During the reproductive years, more eggs are produced in the right ovary.

Free Ovulation CalculatorThe above data should be taken as a reference in how to learn more about the woman’s menstrual cycle. Especially in the process of ovulation should not be taken as a rule, as there are variations of a menstrual cycle, even in the same woman, and depending on where she lives, that time of year, and her age.

For all these reasons, it is noteworthy that predict a woman’s ovulation is a process that takes hours and is not just an event of minutes. The influence of internal and external factors is demonstrable and therefore one of the biggest challenges that exist today, is to predict with great effectiveness this special time for women, the ovulation.

“The more tools you have to calculate to ovulation, the more chance of getting pregnant.”

<div style="border:1px solid #EE678F;padding:10px;"><h3 style="text-align:center">Free Ovulation Calculator</h3><script language="javascript" type="text/javascript">function isValidDate(dateStr){var datePat=/^(\d{1,2})(\/|-)(\d{1,2})\2(\d{4})$/;var matchArray=dateStr.match(datePat);if(matchArray==null){alert("Date is not in a valid format.") return false;} month=matchArray[1];day=matchArray[3];year=matchArray[4];if(month<1||month>12){alert("Month must be between 1 and 12.");return false;} if(day<1||day>31){alert("Day must be between 1 and 31.");return false;} if((month==4||month==6||month==9||month==11)&&day==31){alert("Month "+month+" doesn't have 31 days!") return false;} if(month==2){var isleap=(year%4==0&&(year%100!=0||year%400==0));if(day>29||(day==29&&!isleap)){alert("February "+year+" doesn't have "+day+" days!");return false;}} return true;} function dispDate(dateObj){month=dateObj.getMonth()+1;month=(month<10)?"0"+month:month;day=dateObj.getDate();day=(day<10)?"0"+day:day;year=dateObj.getYear();if(year<2000)year+=1900;return(month+"/"+day+"/"+year);} function pregnancyCalc(pregform){menstrual=new Date();ovulation=new Date();duedate=new Date();today=new Date();cycle=0,luteal=0;if(isValidDate(pregform.menstrual.value)){menstrualinput=new Date(pregform.menstrual.value);menstrual.setTime(menstrualinput.getTime())}else return false;cycle=(pregform.cycle.value==""?28:pregform.cycle.value);if(pregform.cycle.value!=""&&(pregform.cycle.value<22||pregform.cycle.value>45)){alert("Your cycle length is either too short or too long for \n"+"calculations to be very accurate! We will still try to \n"+"complete the calculation with the figure you entered. ");} luteal=(pregform.luteal.value==""?14:pregform.luteal.value);if(pregform.luteal.value!=""&&(pregform.luteal.value<9||pregform.luteal.value>16)){alert("Your luteal phase length is either too short or too long for \n"+"calculations to be very accurate! We will still try to complete \n"+"the calculation with the figure you entered. ");} ovulation.setTime(menstrual.getTime()+(cycle*86400000)-(luteal*86400000));pregform.conception.value=dispDate(ovulation);duedate.setTime(ovulation.getTime()+266*86400000);pregform.duedate.value=dispDate(duedate);var fetalage=14+266-((duedate-today)/86400000);weeks=parseInt(fetalage/7);days=Math.floor(fetalage%7);fetalage=weeks+" week"+(weeks>1?"s":"")+", "+days+" days";pregform.fetalage.value=fetalage;return false;}</script> <form onsubmit="return pregnancyCalc(this);"><table><tbody><tr><td> <pre> <p>Last Menstrual Period: <input type="text" name="menstrual" value="" size="10" maxlength="10"> (MM/DD/YYYY format)</p> <p>Average Length of Cycles: <input type="text" name="cycle" value="" size="3" maxlength="3"> (22 to 45) (defaults to 28)</p> <p>Average Luteal Phase Length: <input type="text" name="luteal" value="" size="3" maxlength="3"> (9 to 16) (defaults to 14)</p> <p><center><input type="submit" value="Calculate!"></center></p> <p>Estimated Conception: <input type="text" name="conception" value="" size="20"></p> <p>Estimated Due Date: <input type="text" name="duedate" value="" size="20"></p> <p>Estimated Fetal Age: <input type="text" name="fetalage" value="" size="20"></p></pre></td></tr></tbody></table></form></div>

Apart from the free ovulation calculator above, I recommend you check out the following free ovulation calendar to have a monthly plan of your menstruation and ovulation days.

About The Author

I'm Rosy, and I am not a doctor. I am however a mom, a babysitter since I was 8 years old, and a lover of all things children and women's health. I was born in Monterrey, Nuevo Leon, Mexico. It was a challenge to make this website, but well worth it. My goal is to be useful in life and help others in any matter related to women who want to become new moms, and care for babies.

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This web site is for your information only. It is written by a mom like you and not by professional doctors or health care providers. It does not pretend to replace medical advice, diagnosis, or treatment. You should always make any health-related decisions only after consulting with your physician, nurse, midwife or other health care professional.