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Due Date Calculator

Enter the first day of your last menstrual period to estimate your due date (40 weeks) and how far along you are.

How to use the Due Date Calculator

  1. Enter your last period’s first day.
  2. Click Calculate.
  3. See your due date and current week.

100% free, no sign-up, and it all runs in your browser — your data never leaves your device.

FAQ

Is this medically exact?

It’s an estimate based on a 28-day cycle (Naegele’s rule). Your provider’s ultrasound dating is more precise.

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