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Ovulation & Fertility Calculator

Calculate ovulation days and fertility window based on your cycle length. Running the tool requires an account; the free account includes 10 one-time operations on eligible tools.

⚠️ Medical note: These calculations are estimates only, assuming regular cycles. Actual ovulation varies. Do not use this tool for family planning decisions — consult your doctor or midwife.

Last Period Start Date

Cycle Length (days)

🔒 Processed locally in your browser — no file is sent to our servers

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Create a free account without a credit card. Start with 10 one-time free operations on eligible tools; your account remains after they run out, and you can upgrade for ongoing use.

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About Ovulation & Fertility Calculator

Calculate ovulation days and fertility window based on your cycle length

Frequently Asked Questions

How do I start using this tool?

You can preview the tool without an account. Running it requires an account; the free account includes 10 one-time operations, with plans for ongoing use.

How does this tool handle my data?

Processing varies by tool: file editing tools process selected files in the browser, while others may call a server or external provider. Check the tool description and privacy policy before entering sensitive data.

Does this tool work on mobile devices?

The site adapts to mobile and desktop screens, but some functions depend on browser and device support.

Ovulation & Fertility Calculator

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About Ovulation & Fertility Calculator

Frequently Asked Questions