🥚 Ovulation tracked 2m ago ·🌱 Fertile window mapped 4m ago ·🔒 100% private ·🌍 Used in 47 countries ·🧠 AI-powered ·👶 Helping women conceive ·🥚 Ovulation tracked 2m ago ·🌱 Fertile window mapped 4m ago ·🔒 100% private ·🌍 Used in 47 countries ·🧠 AI-powered ·👶 Helping women conceive ·
Fertility Calculator · Free · No App Required

When Am I Most Fertile?

🌱 Your body has a rhythm. Let's find your most fertile days and the best time to try.

Upload your calendar or records

Photo gives AI 95%+ accuracy

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Or enter dates manually
28d
🦋

Chatear con Cyra

Comparte tus fechas recientes de menstruación

💜 Hi! I'm Cyra. To find your exact ovulation day I need your last 3–6 period start dates. The more you share, the smarter I get! Your data stays in your browser — nothing is uploaded.
Tus datos están seguros · Se quedan en tu navegador · Sin app necesaria

3 SEGUNDOS

How It Works

📅
01

Enter Your Dates

Last period date and cycle length — or just tell Cyra

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02

AI Finds Ovulation

Calculates your exact ovulation day and fertile window

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03

Get Your Calendar

Color-coded fertility calendar personalized to YOU

Preguntas frecuentes

⚕️ Esta calculadora proporciona estimaciones basadas en matemáticas de ciclo promedio. No sustituye el consejo médico.