Ovulation Calculator

Calculate your fertile window and ovulation date based on your menstrual cycle.

Your Fertility Window

Estimated Ovulation Date
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Fertile Window Start
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Fertile Window End
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Most Fertile Days
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Next 3 Cycles

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Key Dates This Cycle

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Understanding Your Cycle

Ovulation: Usually occurs 14 days before next period
Fertile Window: 5 days before ovulation + ovulation day
Most Fertile: 2 days before ovulation + ovulation day
Egg Viability: 12-24 hours after ovulation
Sperm Viability: Up to 5 days in reproductive tract

? Frequently Asked Questions

How accurate is this

This calculator uses standard formulas and provides accurate results for typical use cases. For professional or critical applications, always verify results with certified professionals or official sources.

Is this calculator free to use?

Yes, this Ovulation Calculator is completely free to use with no registration required. You can use it as many times as needed without any limitations.

Can I use this on mobile devices?

Absolutely! This calculator is fully responsive and works perfectly on smartphones, tablets, and desktop computers.

How do I interpret the results?

The results are displayed clearly with appropriate units. Refer to the About This Calculator section for detailed information.