Free Health Tool

Fertility & Ovulation Assessment

Estimate the fertile window using the last period date and usual cycle length.

Answer a few simple questions

No medical language. Usually under one minute.

First day of last period

Usual cycle lengthUsually 21–45 days

Simple guidance, not a diagnosis.

GoodOverall result

Estimated ovulation—

Fertile window starts—

Fertile window ends—

Follow the advice shown above.

Discuss the result if symptoms are persistent, severe or worrying.

This is an educational screening tool. It does not diagnose disease, replace examination, laboratory testing or emergency care.