METHOD
How it is calculated
Ovulation approximately 14 days before the next period. Central window: 5 days before to 1 day after. The wider range illustrates variability, not a confidence interval.
♡ Health and fitness
Fertile window calculator
An approximate date range for adults with regular natural cycles.
01
Your inputs
Starting values are an example. Replace them with your own.
Your inputs stay in your browser.
02
Your result
Enter your details and run the calculation.
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