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Ovulation Calculator
Free online ovulation calculator. Find your most fertile days based on your cycle length.
Ovulation Date
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Find your most fertile days instantly. Enter the first day of your last period and your average cycle length to calculate your ovulation date and fertility window.
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FREQUENTLY ASKED QUESTIONS
When do I ovulate?
Most women ovulate about 14 days before their next period. For a 28-day cycle, ovulation typically occurs around day 14.
How long is the fertility window?
The fertility window is about 6 days — the 5 days before ovulation and the day of ovulation itself. The 2-3 days before ovulation are the most fertile.
Can I get pregnant outside the fertility window?
It is very unlikely but possible. Sperm can survive up to 5 days inside the female body.
How accurate is this calculator?
This calculator gives an estimate based on average cycles. Cycle length varies and ovulation can shift due to stress, illness, or other factors.