6-Day Fertile Window Method

Fertility Window Calculator

Identify your 6-day fertile window: 5 days before ovulation plus ovulation day. Sperm can survive up to 5 days, but the egg is only viable for 12-24 hours.

Next Expected Ovulation Date

Or: Last Period Start + Cycle Length

Cycle Length (if using last period)

Luteal Phase (days)

Data stays on your device

Medical Disclaimer: Fertility predictions are estimates. Individual cycles vary. Consult your healthcare provider for fertility concerns.