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Ovulation / Fertility Calculator
Estimate an ovulation date and a possible fertile window.
Your details
Your result
Enter your details and select Calculate.
How it works
Estimate an ovulation date and a possible fertile window.
Estimated ovulation = next period − 14 days
Good to know
Cycle-based estimates are imprecise and cannot be used as contraception. Irregular cycles make predictions less reliable.
Using the Ovulation / Fertility Calculator
How do I use this calculator?
Enter first day of last period, usual cycle length (days). Select Calculate to see the result. Use Reset to return to the example inputs.
What calculation does Wishoo use?
Estimated ovulation = next period − 14 days
What should I keep in mind?
Cycle-based estimates are imprecise and cannot be used as contraception. Irregular cycles make predictions less reliable.
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