Then they either assume that your periods are exactly 28 days apart or that you ovulate exactly 14 days before your next period. A better way is to use over the counter ovulation prediction kits which will help you know when exactly you are ovulating and time intercourse ...Read more.
https://www.healthtap.com/topics/days-past-ovulation-calculator
DPO (Days Past Ovulation) on Chart. The DPO row is shown on the BBT chart if you indicated you ovulated during the cycle you are editing/viewing. Days Past Ovulation (Days 1 to N), also referred to as your luteal phase, is the number of days following ovulation up to the day before your next cycle starts.
http://mymonthlycycles.com/bbtcoverline.jsp
Varies: Depends how accurate your due date estimates are. If you have a super-reliable dating then the reverse calculation is pretty good, like within 3-4 days. If your EDD is +/- 2 weeks as it often is, then the reverse calculation will be not useful. Good wishes. ...Read more.
https://www.healthtap.com/topics/days-past-ovulation-calculator
TTC Tools - Ovulation Calculator. Increase your chances of getting pregnant! Our Ovulation Calendar is designed to help you predict ovulation - your peak time for becoming pregnant - as well as calculate a pregnancy due date given successful conception.
http://www.ovulation-calculator.com/ttc-tools/ovulation-calculator.htm
Determine your most fertile days and increase your chance of conceiving. Please enter a valid date. Start with the first day of one period and count right up to the day before the first day of your next period. Count the first day of bleeding or spotting as day one. The average cycle length is 28 days, but can range anywhere from 20 to 45 days.
http://www.firstresponse.com/en/Online-Tools/Ovulation-Calculator
The luteal phase, or post-ovulation (from ovulation to menstruation), is generally the same length for most women - averaging about 14 days. As a rule, the egg is released 10 to 16 days before menstruation, or the start of the next menstrual cycle. If you have heard the term DPO on preconception chats, this refers to days past ovulation. High sensitivity pregnancy tests can allow you to begin testing for pregnancy at around 7-10 days past ovulation.
http://www.ovulation-calculator.com/menstrual-cycle.htm
The length of your LP - or luteal phase - will typically be between 11 and 16 days. The average is 14 days, and the default LP length for our ovulation calendar is 14 days. The luteal phase corresponds to days past ovulation - or DPO.
http://www.ovulation-calculator.com/ttc-tools/ovulation-calculator.htm
Too early: Whatever day your ovulation occurs, fertilization (if it happens) will be within roughly 24 hours (1 day.) an embryo will travel into the uterus within about 3 days p.O. But will not implant until between the 6th and 7th day p.O. ...Read more.
https://www.healthtap.com/topics/days-past-ovulation-calculator
Use our free ovulation calculator to determine an approximate date of ovulation. If you have irregular menstrual cycles, the calendar may be less accurate than for women with regular menstrual cycles. Other methods of charting fertility can be found below in our natural methods categories.
http://www.ovulation-calculator.com/ttc-tools/ovulation-calculator.htm
The BBT temperatures for the 6 days prior to ovulation are read for this cycle. Five of the six must have temps recorded; One discard (or non-recorded temp) is allowed. The coverline is drawn 0.1 (Fahrenheit) or 0.05 (Celsius) of a degree above the highest temp.
http://mymonthlycycles.com/bbtcoverline.jsp
calculate days past ovulation
The number of days following ovulation up to the day before your next cycle starts. Days past ovulation can calculate as the number of days following ovulation up to the day before your next cycle starts.