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Pregnancy Due Date & Ovulation Calculator

Estimate a due date, likely ovulation date and fertile window.

Choose the first day of the last period and enter a whole-number cycle length to see the estimates.

Dates are estimates and ovulation varies. Pregnancy dating should be confirmed by a healthcare professional. Seek urgent medical care for concerning symptoms.

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How to use Pregnancy Due Date & Ovulation Calculator

  1. 1Choose the first day of the last period using the date field or calendar button.
  2. 2Enter the average cycle length as a whole number of days.
  3. 3Review the estimated fertile window, likely ovulation date and estimated due date, then share the results if useful.

Useful tips

  • •Use the usual average cycle length rather than the length of one unusual cycle.
  • •The fertile window and ovulation date are estimates because cycles can vary.
  • •Use Share Results to open the device sharing menu or copy a clearly labelled estimate.

Frequently asked questions

Are these dates exact?

No. They are estimates based on the entered last-period date and average cycle length.

Should the due date be medically confirmed?

Yes. Pregnancy dating should be confirmed by an appropriate healthcare professional.

Are my dates stored when I share them?

No. Wid9et does not store these entries. Sharing only starts when you press Share Results.