Calculate Fertile days after Period - Ovulation Calculator

If you and your partner plan to get pregnant, you don't know the perfect timing when you and your partner have intercourse and get the expected result. So now you need not worry as this calculator can help you understand your fertile window – or your window of conceiving during a regular menstrual cycle. Having sex every couple of days during your fertile window raises the chances of conceiving.

This calculator is a very accurate and helpful invention. However, to get more precise outcomes, you must keep track of your last period dates. But in case you have an irregular menstrual cycle, calculating your ovulation becomes more difficult, but going by your shortest period might be the best way that you may choose for calculation. Besides, ovulation urine tests are beneficial that gives you an idea of your fertility window, or you may consult your fertility specialist for more suitable options that shall be fruitful.

What is your fertile window?

When you ovulate, eggs are released from the ovary and head towards down the fallopian tube. It usually survives in the reproductive tract for approximately 12-24 hours, and this the perfect time for getting pregnant as sperm fertilizes the egg during this time only. If sperm does not meet an egg during this time, then the egg sheds with the uterine lining during menstruation.

Therefore, your chances to get pregnant are highest within 24 hours of ovulation and one day beforehand. Moreover, you may observe by reproductive endocrinology and infertility specialist that conception is only possible if you are sexually active in the five days leading up to ovulation. It is so because sperm can survive in the reproductive tract for five days, implying that old sperm may still fertilize a newly released egg.


If you want to know your fertile window, online ovulation calculators are the best ways to opt. However, sometimes women with regular cycles also fail to get accurate outcomes after using this calculator. So, we bring more helpful methods that may help you to get your most fertile days.


Keep track of your cycle:

When you know your most fertile days, you must note the length of a cycle by creating a menstrual chart. After that, you shall start tracking your menstruation cycle continuously for few months with a paper journal or mobile app. Then you may analyze the data to obtain your average cycle length.

According to the specialists from the first day of your menses you shall mark day one of your cycle, and ovulation usually occurs around 14 days before your next period is due. For instance, if the interval between periods is 28 days, then ovulation is believed to happen on day 14. also, if the cycle length is 30 days, then ovulation is expected on day 16 of a cycle. Therefore, since a female is most likely to fall pregnant on the day of ovulation and the five days before it, the fertile window in such case is days 9-14 and days 11-16.

Observe your ovulation.

Signs that you are Ovulating    

  • An increment in basal body temperature(typically 1/2 to 1 degree).
  • Rising of luteinizing hormone (LH) hormones,
  • You may observe clear, thin and stretchy vaginal discharge or cervical mucus.
  • Light spotting     
  • Breast tenderness    
  • Bloating 
  • Slight pain or cramping at one side.

Ovulation Predictor Kits (OPKs)

Ovulation predictor kits (OPKs) focuses on performing a urine test to identify the fertile window. In addition, they monitor the luteinizing hormone (LH) level, which rises roughly 36 hours before ovulation. Couples expecting pregnancy are advised to have sex soon after detecting the rise in LH level to increase the chance of conceiving.

Monitoring Cervical Mucus

During the fertile window, you might notice that the volume of cervical mucus increases and is more transparent and slippery compared to other times of the cycle. You must observe and ensure that If your mucus is looking slimy and thick, it implies an excellent opportunity you're ovulating.

Charting Basal Body Temperature (BBT)

The analysis states that a woman's resting body temperature increases during ovulation. Therefore, noting down your basal body temperature in the morning with a BBT thermometer helps monitor ovulation. However, this method detects ovulation only after it has already happened. Hence it is recommended to seek further advice from your specialist.

Fertility Monitors

To determine your most fertile days, these ovulation calculators find out your LH and estrogen. They are pretty helpful but costly as compared to ovulation predictor kits.

How long should I try for before seeking specialist advice?

Experts say that when you try to conceive naturally for persistent 12 months and fall under 35 years old or for six months and you over 35, but fails every time, then you must consult or nearest fertility professional. A fertility specialist will examine and analyze you for simple fertility tests to figure out the reason for failed conception to help you conceive sooner in the safest ways.

Frequently Asked Question'S

When I am most fertile?

Fertile windows or days are individual specific and may vary from person to person and can be different from month to month in the same woman. The day of ovulation is considered the perfect day to conceive, or usually, the specialist suggests days 14 and 15 of the average menstrual cycle. However, in some cases, it is seen that women can still get pregnant in their fertile window, which means on the day you ovulate and five days before it (i.e. days 10-15).

What if you have irregular menstrual cycles?

If you have irregular menstrual cycles or your cycle length keeps fluctuating from month to month, it becomes challenging to calculate your ovulation date. In such a scenario, ovulation urine tests, ovulation tracking and seeking further suggestions from your Fertility Specialist might be helpful.