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Period Tools

Period Tools

Free, accurate women's cycle & pregnancy calculators

lucygrantlucygrant·Published on Sep 14, 2026·0 reputationReputation invested into this product to boost its ranking. Anyone can spend the reputation they've earned here — recent investments count for more and lift the product higher on the leaderboard. This is separate from community upvotes.
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Categories
Health & WellnessMobile AppsProductivity & Notes
Use cases
Date and time calculationsForecastingScheduling & Booking
Target audience
ParentsPrivate personsStudents
Pricing model
Free
Platforms
WebiOSAndroid

▤ Screenshots

About Period Tools

Free suite of women's-health calculators — period & cycle predictor, ovulation / fertile-window, pregnancy due date, gender predictor, blood type. Mobile-first, nothing saved, no signup.

A free, browser-based period calculator that predicts your next periods, ovulation day, and fertile window based on your last cycle date and average cycle length. It uses a standard luteal-phase model, estimating ovulation as 14 days before the next expected period and projecting multiple future cycles for planning. The tool explains key cycle phases, including menstrual, follicular, ovulation, and luteal stages, and highlights fertile days when conception is most likely. All calculations run locally in the browser with no data stored or sent to a server, ensuring full privacy and instant results for cycle tracking and fertility planning.

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