🔒 All calculations happen entirely in your browser. No data is ever stored or transmitted.
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Ovulation Calculator

Free fertility tracker — private, instant, no signup required

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📅 Enter Your Cycle Details

21 days (shorter) (longer) 35 days

Calendar Key

Period days (1–5)
Fertile window
★
Peak ovulation ★
Next period start
Today
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🛒 Fertility Essentials

Curated products that may support your fertility journey — affiliate links help keep this tool free.

🧪
Ovulation Test Strips (50-pack)
Track your LH surge at home · Amazon
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Prenatal Vitamins with Folate
Essential nutrients before & during pregnancy · Amazon
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Basal Body Thermometer (BBT)
High-precision 2-decimal reading for BBT charting · Amazon
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⚕️ Medical Disclaimer: This calculator is for informational purposes only. Cycle predictions are estimates based on average patterns and may not reflect your individual biology. Always consult a qualified healthcare provider for personalized medical advice, diagnosis, or treatment.

🔒 Privacy Policy

We do not collect, store, or transmit any personal health data. All calculations are performed locally in your browser using JavaScript. No cookies are used, no analytics or tracking scripts are loaded, and no network requests are made for any calculations. This tool works entirely offline once the page has loaded. Your health information stays completely private — always.

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