Fertility Window Rechner — Formel

Fertility Window

The fertile window is the 6-day period ending on the day of ovulation.

Ovulation Day = Cycle Length - 14 Fertile Window = Ovulation Day - 5 to Ovulation Day

Conception Probability by Day

Day Relative to OvulationProbability -5~5% -4~10% -3~15% -2~25% -1 (Peak)~30% 0 (Ovulation)~12%

Lösungsbeispiel

A 28-day cycle, currently on day 8.

  1. Ovulation = Day 14
  2. Fertile window = Day 9 to Day 14
  3. Peak fertility = Day 13
  4. Days until fertile window = 9 - 8 = 1 day