Pregnancy Calculator for Conception,
Gestation & Due Dates

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Input Data

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

(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)
Output Data

Estimated Fertility Window:

to

Estimated Conception Date:

Estimated Gestational Age:
(how far along your pregnancy is)

Estimated Due Date:
(only 5% born on their due date!)

This is not a diagnosis. The calculations that are provided are estimates based on averages.

Last Updated: 10/2005