🩺 Ovulation Calculator

Predict ovulation days and fertile windows for family planning.

Calculator
Fertile Window
Cycle Info
Reference

Ovulation Calculator

Please enter your last period date and average cycle length.

Fertile Window

The fertile window is the period when pregnancy is most likely. It usually spans 6 days: 5 days before and the day of ovulation.
Cycle LengthOvulation DayFertile Window
21 daysDay 7Day 2 - 7
28 daysDay 14Day 9 - 14
35 daysDay 21Day 16 - 21

Cycle Information

A typical menstrual cycle lasts 21-35 days. Ovulation usually occurs 14 days before the next period.
PhaseDaysDescription
Menstrual1-5Bleeding, shedding uterine lining
Follicular1-13Egg matures, estrogen rises
Ovulation14Egg released, most fertile
Luteal15-28Progesterone rises, uterine lining prepares

Reference & Information

Ovulation Day: Usually 14 days before next period.
Fertile Window: 5 days before and the day of ovulation.
Cycle Length: Varies 21-35 days.
Note: This calculator provides estimates. Consult a healthcare provider for personalized advice.