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Date Calculator: Ovulation/Fertility, Conception, Gestation, & Due Dates

There are several ways to determine your ovulation, conception, gestation, and due dates. We recommend that you read the articles on Understanding Ovulation and Calculating Conception, Gestation, and Due Dates to understand why these dates are important and how they are calculated. This tool uses the same methods described in those articles, but allows you to enter the first day of your last menstrual period to calculate these dates instantly. As with our Ovulation Calendar, we recommend that you read about Fertility Awareness/Natural Family Planning before using these dates to prevent pregnancy.

ONLY REQUIRED FIELD:
First Day of Last Menstrual Period:
(first day of bleeding; called LMP)


(MM/DD/YYYY)

Average Length of Cycles:
(from first day of your period to the first day of your next period)


(22 to 44; default = 28)


Estimated Fertility Window:

 thru

Estimated Conception Date:

Next Period or Positive Pregnancy Test Expected by:

Estimated Current Gestational Age:
(how far along your pregnancy currently is from LMP)

Estimated Due Date:
(only 5% of all babies are born on their due date!)

For further information email one of our Reproductive Educators or call our helpline at 1-800-672-2296.

The information contained on this site herein is for educational purposes only and is not meant for diagnosis or treatment. Any information found on this site should be discussed with a health care professional. Use of this information should be done in accordance with the health care plan outlined by your health care professional. For specific medical advice, diagnosis, and treatment, consult your doctor. All content is copyrighted by the American Pregnancy Association unless otherwise noted.