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Ovulation Calculator
Enter your last period date and cycle length — instantly find your most fertile days and next expected period.
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Details
Result
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Estimated ovulation date
Fertile window (highest chance)—
Next expected period—
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How to use — Ovulation Calculator
- Enter the first day of your last period and set the average cycle length.
- Get your ovulation date, fertile window (when conception chances are highest), and next period instantly.
FAQ
What is ovulation?
The release of a matured egg from the ovary — this typically happens 14 days before the next period. The 5-6 days around this are best for conceiving.
What is the fertile window?
From 5 days before ovulation to the day of ovulation — sperm can survive up to 5 days, so this entire window is considered fertile.
Can this be used with irregular cycles?
The estimate is less accurate with irregular cycles. Basal body temperature or ovulation kits are more reliable — this tool is a starting point.
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