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|
|Jul 31, 2018||Jul 27 - Aug 4||Jul 27 - Aug 1||Aug 14, 2018||Aug 9, 2018||Apr 24, 2019|
|Aug 28, 2018||Aug 24 - Sep 1||Aug 24 - Aug 29||Sep 11, 2018||Sep 6, 2018||May 22, 2019|
|Sep 25, 2018||Sep 21 - Sep 29||Sep 21 - Sep 26||Oct 9, 2018||Oct 4, 2018||Jun 19, 2019|
|Oct 23, 2018||Oct 19 - Oct 27||Oct 19 - Oct 24||Nov 6, 2018||Nov 1, 2018||Jul 17, 2019|
|Nov 20, 2018||Nov 16 - Nov 24||Nov 16 - Nov 21||Dec 4, 2018||Nov 29, 2018||Aug 14, 2019|
|Dec 18, 2018||Dec 14 - Dec 22||Dec 14 - Dec 19||Jan 1, 2019||Dec 27, 2018||Sep 11, 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/