Ovulation Calculator
Calculate your ovulation date and fertility window based on your menstrual cycle length and luteal phase.
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Typical range: 21-35 days
Typical range: 12-16 days (default 14)
How to Use the Ovulation Calculator
- Enter the first day of your last menstrual period.
- Set your average cycle length (typically 21-35 days).
- Optionally adjust the luteal phase length (typically 12-16 days).
- Click Calculate to see your ovulation date and fertile window.
Features
- Ovulation date prediction based on cycle data
- Fertile window calculation (6-day window)
- Implantation window estimation
- Multi-cycle forecast for future months
- Customizable luteal phase length
- 100% client-side, no data stored
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Disclaimer: This tool is provided as-is for informational and educational purposes only.