Ovulation Calculator​: Know Your Most Fertile Day!

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Your best days to conceive are
February 2021
February 2021

Did you know that you can only conceive a few days of each month around ovulation when an egg is released? Well, there’s a bit of science and math involved here. Online ovulation calculators, charts, and calendars are tools that attempt to predict when you might ovulate.

Our online ovulation calculator, just like any of the best ovulation calculators, takes into account your menstrual cycle to determine the ovulation date. It is based on the typical length of your menstrual cycle and the expected window for ovulation to help time sex for getting pregnant.

Menstrual Cycle & Ovulation Calculator: How Are They Related?

Your menstrual cycle begins on the first day of your period and continues till the first day of your next period. It is during this time that eggs or ova begin to mature in the ovary. The womb prepares itself by thickening the lining (endometrium). It is also during this time that there’s a change in your cervical mucus. It becomes thinner and clearer to help the sperm reach the released egg. Approximately 10 to 16 days before the start of your next period, an egg is released from one of the ovaries.  This process is known as ovulation.

The egg may be fertilized if sperm is present during or within 24 hours of ovulation. If the egg is not fertilized or does not implant, the woman’s body sheds the egg and the endometrium. This shedding causes bleeding in a woman’s menstrual period. When a fertilized egg does implant, a hormone called human chorionic gonadotropin (hCG) begins to be produced in the uterus.

How To Know When Will I Ovulate?

The typical cycle length is anywhere between 21 and 35 days and it varies from woman to woman. Also, some women have irregular periods. Thus, your fertile window will depend on the length of your cycle and the regularity of your periods.

But you can boost your chances of conceiving by getting your fertile eggs and your partner’s sperm together as often as possible during your fertile window. You can do this only a few days of each month around ovulation when an egg is released. You can use our ovulation calculator which is one of the best ovulation calculators to determine your fertile window.

How To Calculate Ovulation Using An Ovulation Calendar?

Our ovulation calculator estimates when you’ll ovulate by counting back 14 days from the day you expect your next period. For instance, if your cycle is 28 days long, your next period should start 28 days from the first day of your last period.

Your fertile window includes the day you ovulate and the five days before. But keep in mind that you’re more likely to get pregnant during the last three days of this time frame. However, it is to be noted that counting back 14 days does not always apply as menstrual cycles can vary from woman to woman and month to month (the typical length of a cycle is anywhere between 21 and 35 days). Also, if you have irregular periods, it may become even more difficult to answer how to calculate ovulation as it might be tougher to pinpoint your fertile window.

What Are The Signs Of Ovulation?

You might not have noticed them, but your body gives off ovulation symptoms, which serve the same purpose as an ovulation calculator or an ovulation tracker. Here are some symptoms to look out for:

Change In Cervical Mucus

The cervix secretes mucus throughout the menstrual cycle. It starts off sticky white and becomes thinner and clearer, gradually as your cycle progresses.

The mucus increases and becomes much thinner, slippery, and stretchy before and during ovulation. It is often comparable to raw egg whites. This thinner mucus helps the sperm swim easily through it. Thin and slippery mucus indicates that you are in your fertile phase. So if you’re trying to conceive, this would be an ideal time.

Basal Body Temperature

During your ovulation, your basal body temperature rises about 0.2°C. You can also track your menstrual cycle by taking your temperature each morning when you wake up. But this method is not very effective as it is only an indicator that you’ve ovulated and doesn’t give you much information about when your fertile window starts.

Using Ovulation Test Kits

Ovulation predictor kits that are available over the counter are fairly simple to use. They check for luteinizing hormone (LH) in your urine that increases 24-36 hours before ovulation is about to take place. Although a woman can be fertile for a day or so before and after this time, this simple test will help to identify the best two days for conception.

It is recommended to become familiar with your usual menstrual cycle to help figure out when you should start testing. If your cycle is irregular then an ovulation predictor kit can help you identify the time of ovulation, but you’ll be expected to use more of the test strips.

Other symptoms of ovulation include:

  • Breast Tenderness
  • Bloating
  • Slight Pain Or Cramps
  • Light Spotting

Tips For Getting Pregnant

Here are some tips for you to try when you’re trying to get pregnant, apart from using an ovulation calculator to determine the most fertile window:

Take Your Prenatal Vitamins

Studies have shown that women who were taking their prenatal vitamins while undergoing fertility treatments were twice as likely to get pregnant as compared to those who were only taking a folic acid supplement while going through the same treatments.

Know Your Ovulation

Once you’ve familiarized yourself with your ovulation by using an accurate ovulation calculator and ovulation symptoms, it’s recommended to time having sex around it. You can start a few days before you ovulate, which in most cases is midway through your cycle. It is considered ideal to have sex on the day of ovulation, but this is difficult to pinpoint.

Eat Healthily

Your diet can play a major role when you’re trying to conceive. Incorporating plenty of healthy fats like omega-3s, folate, calcium, protein, iron, and fiber into your daily diet can help your body prepare itself to conceive a baby.

Sleep Well

Make sure you get seven to eight solid hours of sleep when you’re trying to conceive. Research has shown that disrupted sleep has been linked to irregular periods, which can hinder your fertility. Sleep is also important to keep a lid on stress, which has also been found to hamper baby-making plans.


When you’re planning on getting pregnant, it isn’t the time to turn into a couch potato. Light to moderate exercise for 30 minutes daily can boost your fertility. Whether you’re hitting the gym, doing home workouts, or lifting weights, try to keep fit.


Studies have shown that stress may make it harder to get pregnant. Yoga, long walks, jogging, and meditation can help lower stress and improve your overall well-being.

Cut Out On Harmful Habits

Smoking and drinking alcohol have a negative impact on fertility and getting pregnant. It’s also a good idea to stop these while you’re trying to conceive. Also, cut back your caffeine consumption to no more than 200 milligrams a day (about a 12-ounce cup of coffee).

When using an ovulation calculator, look at the information as a suggestion and not a fact. If the calendar says you will likely be ovulating on a particular day, you should consider the week before and after that date as your potentially fertile days.


1. What are my fertile days?

The typical length of a cycle is anywhere between 21 and 35 days and it varies from woman to woman. Also, some women have irregular periods. Thus, your fertile window will depend on the cycle length and regularity of your periods. Using an ovulation calendar or an online ovulation calculator will help you determine the time frame of your fertile days. Just enter the day of your last period and the length of your cycle and you'll get to know your fertile days.

2. Can I get pregnant 7 days after my period?

It's unlikely that you will conceive just after your period, although it can happen. It's important to remember that sperm can sometimes survive in the body for up to 7 days after you have sex.

3. How many days after your period do you ovulate?

The typical length of a cycle is anywhere between 21 and 35 days and it varies from woman to woman. Also, some women have irregular periods. Thus, your fertile window will depend on the cycle length and regularity of your periods. Using an ovulation calculator is the best way to determine the ovulation window.

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