Frequently Asked Questions
How is ovulation day calculated?
Ovulation typically occurs 14 days before your next expected period. For a 28-day cycle, this would be around day 14.
When is the fertile window?
The fertile window spans from 5 days before ovulation to the day of ovulation itself. Sperm can survive in the body for up to 5 days.
How accurate is this calculator?
It is fairly accurate for women with regular cycles. However, it cannot replace medical diagnosis. Use ovulation test kits for more precise confirmation.
Updated 2026 — WHO standards