Homepage/Fertility Calculator/Ovulation Period Estimator
Estimates the ovulation day, fertile window, and expected next menstrual period based on the last menstrual period and average cycle length. Suitable for preliminary scheduling in natural conception and artificial insemination cycles; results are for reference only.
Estimate the possible ovulation date and fertile window based on the last menstrual period and average cycle length.
The estimated next menstrual period date P = Last Menstrual Period (LMP) + cycle length; the estimated ovulation day O = P − 14 days, i.e., O = LMP + cycle length − 14 days.
The fertile window is approximated as about 5 days before ovulation to about 1 day after ovulation; it is not a precise prediction.
Estimated ovulation date, possible fertile window, expected next menstrual period date, and description of prediction methods.
Ovulation timing cannot always be accurately determined and typically occurs about 10–16 days before the next menstrual period; do not treat "cycle length minus 14 days" as a test result.This tool should also not be used for contraceptive decisions..
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