

Plan smarter with fertility insights.
Sperm can last up to 7 days and the egg for 24 hours. Having regular sex before, during and after these dates increases your chance of pregnancy.
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Please note that this is only an estimation of your menstrual cycle.
Your next period
Take a pregnancy test on
Your estimated due date
The ovulation calculator estimates the most probable ovulation/fertile window as well as other related dates. The estimates are based on a woman’s last period date. This ovulation calculator provides an estimate of your fertile window and is not a guarantee of pregnancy or of birth control. Talk to your doctor or nurse to plan for pregnancy and find birth control that works for you.


A menstrual cycle begins on the first day of your monthly cycle or period and ends on the day before your next period. Although the average length of a menstrual cycle is 28 days, the same varies from woman to woman. Women may experience shorter and longer cycles of 23 to 35 days, and this is considered normal unless one is suffering from underlying health conditions.
Ovulation is when your ovaries release an egg each month. It is an important phase in a woman’s menstrual cycle as it is during this phase that the ovary releases an egg for fertilisation. This usually happens about two weeks before your period starts. Therefore, the chances of getting pregnant are highest five days before and on the day of ovulation.
If you are trying to get pregnant, knowing the dates when you are more fertile can help you conceive a child. Instead of predicting your ovulation date, you can use an ovulation calculator to know your fertile window in the coming months. This can help to plan a pregnancy or avoid an unwanted one.
Some common signs of ovulation are —
An ovulation calculator can help you estimate your fertile window and increase your chances of getting pregnant. Although different ovulation calculators work differently, they basically need the same information.
Therefore, to know your next ovulation date, you must enter the following information:
• The start date of your last period
• The average length of your menstrual cycle
Once you enter and submit the information, the calculator shows an estimate of your most fertile days. Since your menstrual cycle may differ every month, you can use the calculator after you get your period to know when you may be ovulating. Knowing your most fertile days can help you get pregnant or avoid an unwanted pregnancy.
When you are looking to calculate your fertile window to get pregnant or to avoid pregnancy, you can simply use an online ovulation calculator. However, to use the calculator and to get accurate or near-accurate results, you must enter the required data correctly. The calculator will ask you to enter the first day of your last period and the number of days in your menstrual cycle. With this information, the calculator will estimate your next ovulation date.
NOTE : This tool provides approximate dates only and assumes a regular menstrual cycle. The timing of your fertile window can be unpredictable, even if your cycles are usually regular.
Irregular periods can make it challenging for you to track your ovulation or fertile window. In this case, you can use the ovulation test kits. Look out for the signs of ovulation and use the test kit when you notice one or more signs, such as pain on one side of the pelvis and light vaginal bleeding. You can also monitor your basal body temperature often to understand if you are nearing ovulation or have ovulated already. If your BBT is lower than usual, you are about to ovulate, and this is the best time to conceive. Once you ovulate, you will notice an increase in your BBT.
The best time to conceive is 5 days before ovulation and the day you ovulate. Therefore, you get a 6-day window every month to get pregnant. The average length of a menstrual cycle is 28 days. If your periods are normal and regular, ovulation will happen between 13 and 15 days. You can use the ovulation calculator for accurate or near-accurate results and plan your pregnancy accordingly. Also, use ovulation test kits around your ovulation date to be doubly sure about the same.
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What people were most curious about
How accurate is the ovulation calculator?
If your menstrual cycles are regular, i.e., the length of your cycles is the same every month, the ovulation calculator can calculate your fertile days accurately. However, the calculator may not show precise results for women with irregular monthly cycles.
Is ovulation only on one day?
Yes, ovulation happens on one day but you have a 6-day window every month to get pregnant. This window starts 5 days before ovulation plus the ovulation day. Sperm can live inside a woman’s body for a maximum of 5 days. However, you can also get pregnant after ovulation if you have intercourse within 12-24 hours. If you miss one fertile window, you cannot get pregnant until your next menstrual cycle.
Does ovulation cause bleeding?
Ovulation can cause light bleeding in many due to changes in oestrogen and progesterone levels in the body. This is also called ovulation spotting, and it happens outside the regular periods. The bleeding is very light and can happen between 11 and 21 days after the first day of your period. Ovulation depends on the length of your menstrual cycle. If the length of your menstrual cycle changes by 3 to 4 days every month, you will notice ovulation spotting on a different day every month.
Can conceiving at certain times increase my chances of having twins?
No, there's no way to increase the chances of having twinis. It may be more likely to happen for you if you're having fertility treatment, are over 35, or if twins run in your family.
Can you still get pregnant when you are not ovulating?
You can get pregnant only when the sperm fertilises your egg. Therefore, ovulation is the best time to conceive a child. However, there are some chances of getting pregnant a week after your period. Sperm can survive in your body for about 5 days, so if you have intercourse after 7 days of your period and you ovulate within the next 5 days, you can get pregnant. However, it is highly unlikely to get pregnant when you are having periods or after the fertile window of 6 days.
Published on 01 February 2024
Last updated: Feb 01, 2024
References:
https://www.healthline.com/health/womens-health/ovulation-symptoms#ovulation-signs
https://www.thebump.com/a/ovulation-symptoms-signs-of-ovulation
https://www.mayoclinic.org/healthy-lifestyle/getting-pregnant/expert-answers/ovulation-signs/faq-20058000
https://uscfertility.org/3-ways-test-ovulation-home/
https://www.winfertility.com/blog/five-techniques-monitor-predict-ovulation/
https://www.motherhoodindia.com/ovulation-calculator/#:~:text=An%20ovulation%20calculator%20can%20help,as%20a%20method%20of%20contraception
https://www.womenshealth.gov/ovulation-calculator
https://www.tommys.org/pregnancy-information/calculators-tools-resources/ovulation-calculator
https://www.whattoexpect.com/ovulation-calculator/#tips
https://www.healthline.com/health/pregnancy/ovulation-bleeding#timeline
https://knix.com/blogs/resources/can-you-get-pregnant-when-not-ovulating
Disclaimer: This blog provides general information and discussions about health and related subjects. The information and other content provided in this blog, website or in any linked materials are not intended and should not be considered, or used as a substitute for, medical advice, diagnosis or treatment. Kindly contact your Doctor before starting a new medicine or health regime.
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