Estimate Fertile Days
About Ovulation Estimates
This calculator gives general date estimates based on average cycle timing. Real ovulation can vary because of stress, illness, hormones, travel, sleep, medication, and cycle irregularity.
- Ovulation is often estimated about 14 days before the next period.
- The fertile window is commonly estimated as the 5 days before ovulation plus ovulation day.
- For medical or fertility decisions, speak with a qualified healthcare professional.
- This tool is not a contraceptive or medical diagnosis tool.