1st Day of Last Menstrual Period:
Average Length of Cycles: (22 to 45)
(defaults to 28)
Average Luteal Phase Length: (9 to 16)
(defaults to 14)
Estimated Due Date:
Estimated Fetal Age:
Our ovulation calculator provides dates for predicting ovulation. For best accuracy you may want to use this along with other tools such as a BBT Chart.