How it works
Ovulation usually happens about 14 days before your next period. The fertile window is the few days around ovulation.
Ovulation ≈ Last period + (Cycle length − 14) days
How the estimate works
This calculator uses an average cycle. Actual ovulation can vary, especially with irregular cycles, so treat the result as an estimate rather than an exact date.
When to see a professional
If your cycles are very irregular or you have been trying to conceive for a while, a doctor can offer more precise testing and guidance.