buncha.tools
buncha/time & productivity/ovulation

Ovulation Calculator

For awareness only. This calculator predicts based on cycle averages. It is not reliable contraception and not a substitute for medical advice. Cycles vary — fertile windows can shift.
First day of last period
Cycle length28 days
From day 1 of one period to day 1 of next
Period length5 days
How long bleeding typically lasts
Ovulation typically occurs 14 days before your next period. Fertile window is the 5 days before plus the day of ovulation.

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About Ovulation Calculator

Track your menstrual cycle, predict fertile window and ovulation. Free online ovulation tracker.

Everything happens on your device. Close the tab and it's gone.
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Built browser-first. Run by one developer.
Every tool runs on your device. No tracking pixels, no sign-up to start. The numbers below are pulled live from the registry.
386
Free tools
Across 14 categories
27
AI tools
Powered by Claude API
Files never uploadNo tracking pixelsNo sign-up neededWorks in any modern browser
The handful of AI tools (paraphrase, summarise, blog, captions, etc.) send your prompt text to Anthropic's Claude API to do the work. Files, images, PDFs and video never leave your device. Pick the tools that fit your privacy comfort.