Advanced Fertility & Ovulation Calculator

Track your menstrual cycle, predict ovulation, and identify your most fertile days with our scientifically-proven calculator

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Ovulation Calculator

Enter your cycle information to calculate your fertility window

First day of last period:

Average cycle length (days):

Luteal phase length (days):

Period duration (days):

Your Fertility Analysis

Next Period

Fertility Window

Ovulation Day

Your Fertility Calendar

Month Year

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Wed

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Understanding Your Fertility Cycle

The Menstrual Cycle Phases

Menstrual Phase (Days 1-5): The uterine lining sheds, resulting in your period.
Follicular Phase (Days 1-13): Follicles in the ovaries mature, preparing an egg for release.
Ovulation (Day 14 in a 28-day cycle): An egg is released from the ovary.
Luteal Phase (Days 15-28): The corpus luteum forms and produces progesterone.

Maximizing Your Fertility

Your fertility window includes the 5 days before ovulation and ovulation day itself. Sperm can survive for up to 5 days in the female reproductive tract, while the egg survives for 12-24 hours after ovulation.

Tracking Methods

Basal Body Temperature (BBT): Track your morning temperature which rises slightly after ovulation
Cervical Mucus: Fertile mucus is clear and stretchy like egg whites
Ovulation Predictor Kits (OPKs): Detect the LH surge that precedes ovulation
Cervical Position: The cervix becomes higher, softer and more open during fertile days