Due Date Calculator

Date of your last period:	(MM/DD/YYYY format)
Length of Cycle:	(22 to 45) (defaults to 28)
Average Luteal Phase Length: See below for more information.	(9 to 16) (defaults to 14)

Your Due Date Information

Estimated Conception:
Estimated Due Date:
Estimated Fetal Age:

What is the luteal phase?

The luteal phase, also referred to as 'days past ovulation' or 'DPO', is the part of the cycle that starts at ovulation and ends the day before your next period. It usually lasts about 14 days and does not vary by more than a day in each person. The luteal phase is named after the corpus luteum (Latin: "yellow body"), a structure that grows on the surface of the ovary where a mature egg was released at ovulation. The corpus luteum produces progesterone in preparing the body for pregnancy. Your luteal phase must be at least 10 days long to support pregnancy.

The only way to determine the exact length of your luteal phase is through hormone-specific blood tests. If you are not sure about the length of your luteal phase, you can assume it is 14 days (the average length for most women).

Medical Disclaimer: The information provided in the Contemporary Women’s Care website should be relied upon for medical education purposes only. It is not intended to replace the independent judgment of a health care provider. The appropriateness of a course of treatment for a patient may vary from the medical information provided herein due to individual conditions and/or complications.