Luteal Phase Cycle Constancy Calculator

Calculate if your luteal phase is constant, or varies: enter the ovulation and next period dates for several of your menstrual cycles, and your luteal phase length for each is calculated and then compared for constancy.

Member? MyMonthlyCycles auto-calculates your luteal phase lengths using your fertility tracker info! See side-bar (or below) for links to these reports/charts.

What is the luteal phase

The luteal phase immediately follows ovulation and is often referred to as Days Post Ovulation (DPO). The luteal phase length is the number of days between ovulation up to the day before the start of your next period. Our bodies know that with the release of the egg, there's a possibility we may get pregnant. So, since there's a chance, and with the help of progesterone (released by the corpus luteum), the lining of the uterus thickens, which gives the egg, if fertilized, a place to attach and grow. If fertilization does not occur, progesterone production plunges, causing the thickened endometrium to slough off, whereupon the next cycle begins, ushered in by our periods. (What is a luteal phase defect?)

Automatic Calculation of Luteal Phase

The following MyMonthlyCycles tools automatically calculate your luteal phase length based on your fertility tracking data. They are available from the Fertility Charting Menu:

Not a member? Join now for MyMonthlyCycles free online and mobile fertility tracker, and to use the above reports, and much more!

Disclaimer: This information is provided for educational purposes only. It is not intended as a substitute for advice provided by a medical doctor or qualified healthcare provider. You should not use this information for self-diagnosis or for treating a health problem or disease. If you have any questions whatsoever about your medical health or believe you have a medical problem or disease, you should contact your medical doctor or healthcare provider.