A woman is usually able to get pregnant for about 5 days each month, when ovulation occurs. On average, ovulation occurs 12 to 16 days before the menstrual period begins. Because sperm can live for 3 to 5 days in a woman’s reproductive tract, it is possible to become pregnant if intercourse occurs several days before ovulation.

Conception Calculator

Please note: when entering the date, make sure you use the correct format (MM/DD/YYYY).

See below for some notes on possible adjustments you should make to the date.

Last Menstrual Period:        
                              (MM/DD/YYYY format; Example 01/01/2009)

Average Length of Cycles:      (22 to 45)
                              (Leave blank for default - 28)

Average Luteal Phase Length:   (9 to 16)
                              (Leave blank for default - 14)



Estimated Conception:         
Estimated Due Date:           
Estimated Fetal Age: