Ovulation Calculator & Calendar

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What is ovulation?

Ovulation is a phase in the menstrual cycle when your ovary releases an egg (ovum). Once an egg leaves your ovary, it travels down your fallopian tube where it waits to be fertilized by sperm. On average, it happens on day 14 of a 28-day menstrual cycle.

Based on the date of your last menstrual period and the length of your typical cycle, discover which days you’re most likely to be fertile and boost your chance of conceiving. Works for baby boy and baby girl or twins!

How do I calculate my exact ovulation date?

Ovulation is the process where a mature egg is released from the ovary, ready for fertilization. This typically happens about 14 days before your next period. (If your cycle is 28 days long, your next period should start 28 days from the first day of your last period.). This means that our free Ovulation Calculator will then estimate when you’ll ovulate by counting back 14 days from the day you expect your next period.

Our Ovulation calculator works for irregular periods. You can enter or adjust your Cycle Length, then use a fertility calendar to find your fertile window.

Is pregnancy 100% when ovulating?

Chances of Getting Pregnant on Ovulation Day are about 20%. It’s no secret that in order to get pregnant, egg and sperm need to meet. An egg is only released during ovulation, about midway through your cycle.

Once an egg has been released, they can only survive for 12-24 hours. That means sperm has a really short amount of time in which it can fertilize the egg.

Additionally, the sperm needs some time to swim all the way through your reproductive system to reach the egg. Because of both of these factors, the chances of getting pregnant on ovulation day are about 20%.

Don’t be worried by how low that number is. The good news is that ovulation day is not the only day each cycle when it’s possible to get pregnant. To enhance your chances of becoming pregnant, it’s crucial to identify your fertile window.

Why online ovulation calculators aren’t 100% accurate

Is there any 100 percent accurate ovulation calculator? There is no such thing as a 100 percent accurate ovulation calculator because biological processes like ovulation can vary greatly between individuals and are influenced by many factors, including stress, illness, and medications.

Identifying your Fertile Window

Your fertile window includes the day you ovulate and the five days before, but keep in mind that you’re much more likely to conceive if you have sex during the last three days of this time frame. Typically, you can get pregnant during about 6 days each month. That’s called your fertility window.

Ovulation calculator boy or girl

Ovulation determines fertility, not gender. Tracking ovulation is great for getting pregnant, but it cannot guarantee a boy or a girl. The most important thing is that the baby is healthy.

When am I Ovulating? How to Calculate My Monthly Fertility Window

Knowing when you’re ovulating is key to tracking your fertility window and determining the best time to get pregnant. There are a few different fertility awareness methods, also called rhythm methods. It’s best to use all three methods if you’re doing natural family planning.

Method 1: Calculating Ovulation through Calendar Method

Use the calendar method to track the length of your menstrual cycle. Each month, mark the first day of your period on a calendar or in a period-tracking app. The number of days between the first day of consecutive periods is the length of your menstrual cycle. You should do this for at least six months to get good data.

You ovulate about 12 to 14 days before the start of a new menstrual cycle. Your fertile window is the five days leading up to ovulation, plus the day of ovulation and the day after ovulation — so about seven days in total.

It’s important to note that if you have irregular periods and the length of your menstrual cycle varies from month to month, the calendar method won’t be accurate for you.

Method 2: Cervical mucus method

Hormone fluctuations during your menstrual cycle change the amount and consistency of your vaginal mucus. You need to feel and look at your vaginal mucus each day and record the results on a chart. You’re likely ovulating (and most fertile) when the mucus is heavy, wet and slippery. It will have the consistency of raw egg whites.

You should chart your vaginal mucus for at least one menstrual cycle. It may be difficult at first to know what to look for, so talk to your provider if you want to try this method. He or she can explain how to chart and describe the mucus each day.

Method 3: Ovulation predictor kits

Ovulation predictor kits are an at-home tool to help predict your ovulation. These tests may be helpful if you have regular periods, but still aren’t quite sure if you are seeing natural signs of ovulation (cervical mucus or a rise in basal body temperature). Ovulation predictor kits test your urine for levels of luteinizing hormone. When the ovulation predictor test becomes positive, ovulation will typically occur within 24 hours, indicating that you’re fertile and should have sex. These kits might not be reliable if you have irregular periods due to polycystic ovarian syndrome.

Method 4: Basal body temperature method to Monitor Your Ovulation and Fertility Window

Also called the temperature method, you take your temperature each morning as soon as you wake up (before you get out of bed). You use a basal body thermometer, which may go in your mouth or your rectum. A basal thermometer is more sensitive than a regular thermometer. It measures body temperature to a tenth of a degree.

A woman’s basal body temperature rises slightly during ovulation (increases by 0.5 degrees Fahrenheit). If you track your temperatures leading up to ovulation, you should see a sustained rise in your basal body temperature after ovulation.

To help you plan, write your body temperature down each day on a tracking sheet. You should track your temperature for at least three months before using this method for family planning.

However, it’s important to note that the basal body temperature method is not good at predicting your ovulation when trying to conceive. Once you identify the rise in your temperature, you’ve already ovulated. However, this method is a good tool to monitor your pattern of ovulation.

Should I have sex before, during or after ovulation?

For the best chances of pregnancy, you should have sex every day or every other day during the:

• Five days leading up to ovulation
• Day of ovulation
• Day after ovulation

How we calculate your Ovulation Days & Fertility

This ovulation calendar estimates when you’ll ovulate based on the date of your last menstrual cycle and the average number of days between your periods.

First, we count back 14 days from the start date of your next expected period to figure out when you’re most likely to ovulate. Then we calculate your fertile window, which can extend a few days before ovulation and possibly up to a day after.

Menstrual cycles vary from woman to woman and month to month (a typical cycle length is between 21 and 35 days). And if you have irregular periods, that might also make it trickier to pinpoint your fertile window.

There are other ways to pinpoint your fertile days and increase your chances of getting pregnant. You might also use an ovulation predictor kit, chart your basal body temperature, and pay attention to changes in cervical mucus.

How many days after your period do you ovulate?

You typically ovulate about 10 to 16 days before your next period starts. For those with a standard 28-day cycle, ovulation often occurs around day 14, meaning about 10 to 14 days after your period ends.

How many days during ovulation can you get pregnant?

Even though your egg only lives for 24 hours, sperm can live in your uterus for between three and five days. This means you can get pregnant from having sex from about five days before ovulation to one day after ovulation. If pregnancy is your goal, it’s better to have sperm already in your body when you ovulate. The highest probability of conception occurs when intercourse takes place one to two days before ovulation and on the day of ovulation.

If my period lasts 3 days when do I ovulate

The 3-day length of your period isn’t the key—what matters is how long your whole cycle is (from the first day of one period to the first day of the next).
Ovulation happens about 14 days before your next period starts.

Here’s the quick way to figure it out:

So for example:

• If you usually have a 28-day cycle, even though you bleed for only 3 days, you’ll likely ovulate around day 14.
• If your cycle is shorter, like 21 days, you may ovulate as early as day 7 (just a few days after your period ends).

What are the symptoms of Ovulation?

These are signs of a successful ovulation. Every person is different and not everyone has signs of ovulation. But, the most common symptoms are:

• Rise in basal body temperature
• Cervical mucus is the texture of egg whites
• Breast tenderness
• Mild cramps or twinges in the abdomen
• Very mild spotting
• Heightened sense of smell
• Increased sex drive
• Changes in appetite or mood
• Bloating

Is pain during ovulation normal?

Yes, many people experience ovulation pain. Ovulation pain (or mittelschmerz) is cramping or pelvic pain that happens around ovulation. You typically feel the pain in your lower abdomen and pelvis, in the middle or on one side. Ovulation pain may happen when an egg bursts from a follicle (the sacs in your ovaries that contain eggs). It can even cause light bleeding.

Pain during the time of ovulation may also be caused by a medical condition, so it’s best to contact your healthcare provider to be sure the pain isn’t something more serious.

What happens if I’m not ovulating?

Certain health conditions or life events may affect ovulation or cause you to stop ovulating. Some of these are:

• Breastfeeding or hyperprolactinemia.
• Menopause.
• PCOS (polycystic ovary syndrome).
• Primary ovarian insufficiency.
• Amenorrhea from things like high or low body fat, excessive stress or fatigue or excessive exercise.

How do I make sure I Ovulate?

If you have regular menstrual cycles, you are likely to be ovulating each month. When you are ovulating, you may notice:

• your vaginal discharge or mucus is slick and slippery (like egg white)
• abdominal pain, often on one side of the tummy
• premenstrual symptoms (e.g. breast enlargement and tenderness, abdominal bloating and moodiness).

Tips for getting pregnant

• Find out when you’ll ovulate using our calculator or an ovulation predictor kit, or by tracking your symptoms.
• Have sex every other day around the time of ovulation.
• Start taking a prenatal vitamin with folic acid at least one month before you start trying (6 months is ideal).
• See your healthcare provider and make sure they’re managing any pre-existing health conditions you may have. Staying up-to-date with vaccinations and regular check-ups and testing can lower the risk of complications during pregnancy.
• Take good care of yourself. You’ll want to kick unhealthy habits like smoking and start incorporating regular exercise into your routine if you haven’t already. Eating a healthy, nutrient-dense diet can help, too.

When is my highest chance of getting pregnant?

Your highest chance of getting pregnant is during the six-day fertile window leading up to and including ovulation, particularly the day before ovulation, and the day of ovulation itself.

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