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Ovulation Calculator

Predict your fertile window with confidence

First day of last period

28 days
5 days

We keep your data on this device only.

Next ovulation

Fertile window

Next period starts

Six-cycle outlook

Fertility tips & reminders

  • Track your periods for at least three cycles so calculations match your body more closely.
  • Aim for healthy sleep, hydration, and stress management to keep ovulation regular.
  • Consider speaking with a healthcare provider if your cycle is often shorter than 21 days or longer than 40 days.