Fertile Window Calculator
Calculate your fertile days and ovulation window with our comprehensive fertility calculator. Track your menstrual cycle and identify the best days for conception.
Step 1: Cycle Information
Understanding Cycle Length
Your cycle length is the number of days from the first day of your period to the day before your next period begins. The average is 28 days, but normal ranges from 21 to 35 days.
Step 2: Fertility Parameters
About Fertile Window
The fertile window includes the 5 days before ovulation and the day of ovulation. Sperm can live up to 5 days in the reproductive tract, while the egg survives for 12-24 hours after ovulation.
Fertility Results
Your Fertile Window
Monthly Fertility Calendar
Calendar Legend
Fertile Days | Ovulation Day | Regular Days
Cycle Phase Breakdown
Fertility Calculation Formula
Ovulation Day = Cycle Length – 14 | Fertile Window = Ovulation Day – 5 to Ovulation Day + 1
Ovulation typically occurs 14 days before the next period. The fertile window includes 5 days before ovulation (sperm survival) and the day of ovulation (egg viability).
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