Calculateur d'Ovulation (Ajusté au Cycle) — Formule

Ovulation Timing

Ovulation typically occurs 14 days before the next period, not 14 days after the last one.

Ovulation Day = Cycle Length - 14

The fertile window spans from 5 days before ovulation through 1 day after, because sperm can survive up to 5 days and the egg lives about 24 hours.

Example Cycle Lengths

Cycle LengthOvulation Day 25 daysDay 11 28 daysDay 14 32 daysDay 18 35 daysDay 21