The Ovulation Calculator estimates most probable ovulation date as well as other related. The estimations are calculated using information such as the first day of a person's last period and the average length of their menstrual cycles in conjunction with what is known regarding typical biological cycles. This calculator should not be used as a form of birth control.
|Most Probable Ovulation Date||Ovulation Window||Fertile Window||Next Period||Pregnancy Test||Due Date if Pregnant|
|Jan 31, 2018||Jan 27 - Feb 4||Jan 27 - Feb 1||Feb 14, 2018||Feb 9, 2018||Oct 25, 2018|
|Feb 28, 2018||Feb 24 - Mar 4||Feb 24 - Mar 1||Mar 14, 2018||Mar 9, 2018||Nov 22, 2018|
|Mar 28, 2018||Mar 24 - Apr 1||Mar 24 - Mar 29||Apr 11, 2018||Apr 6, 2018||Dec 20, 2018|
|Apr 25, 2018||Apr 21 - Apr 29||Apr 21 - Apr 26||May 9, 2018||May 4, 2018||Jan 17, 2019|
|May 23, 2018||May 19 - May 27||May 19 - May 24||Jun 6, 2018||Jun 1, 2018||Feb 14, 2019|
|Jun 20, 2018||Jun 16 - Jun 24||Jun 16 - Jun 21||Jul 4, 2018||Jun 29, 2018||Mar 14, 2019|
Ovulation and Conception
Ovulation in humans is the process by which ovarian follicle(s) rupture and release a mature egg from the ovaries. On average, ovulation occurs within the 4 days before or after the midpoint of a woman's menstrual cycle (14 days before the start of a woman's next menstrual period). Menstrual cycles vary between women however, and a person without a 28-day menstrual cycle may need to track their menstrual cycle to more accurately determine when ovulation might occur.1 It is also possible to use an over-the-counter ovulation test that tests for a surge in some specific hormones that precede ovulation by 24-48 hours. While these tests are 99% accurate in detecting the specific hormones, they cannot guarantee when exactly ovulation will occur within the two-day period.2
Day 10-18 of the menstrual cycle (on average) is the most fertile phase of the menstrual cycle. This is important when trying to conceive because fertilization of the egg can only occur for 12-24 hours after release during part of the luteal phase, when a mature egg travels through the fallopian tubes towards the uterus. Since sperm can survive inside a woman's body for up to five days, regular sex five days before and on the day of ovulation can improve the likelihood of conception.1 If fertilized, the egg will implant in the uterus 6-12 days later. Otherwise, menstruation occurs, and blood and mucosal tissue from the inner lining of the uterus is expelled.
- Mayo Clinic. 2016. "What ovulation signs can I look out for if I'm hoping to conceive?" www.mayoclinic.org/healthy-lifestyle/getting-pregnant/expert-answers/ovulation-signs/faq-20058000.
- American Pregnancy Association. 2016. "Ovulation Kits & Fertility Monitors." americanpregnancy.org/getting-pregnant/ovulation-kits/