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|
|Dec 27, 2018||Dec 23 - Dec 31||Dec 23 - Dec 28||Jan 10, 2019||Jan 5, 2019||Sep 20, 2019|
|Jan 24, 2019||Jan 20 - Jan 28||Jan 20 - Jan 25||Feb 7, 2019||Feb 2, 2019||Oct 18, 2019|
|Feb 21, 2019||Feb 17 - Feb 25||Feb 17 - Feb 22||Mar 7, 2019||Mar 2, 2019||Nov 15, 2019|
|Mar 21, 2019||Mar 17 - Mar 25||Mar 17 - Mar 22||Apr 4, 2019||Mar 30, 2019||Dec 13, 2019|
|Apr 18, 2019||Apr 14 - Apr 22||Apr 14 - Apr 19||May 2, 2019||Apr 27, 2019||Jan 10, 2020|
|May 16, 2019||May 12 - May 20||May 12 - May 17||May 30, 2019||May 25, 2019||Feb 7, 2020|
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/