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Due Date Calculator

Enter the first day of the last menstrual period to estimate the due date, current week of pregnancy, and trimester (Naegele's rule). An estimate, not medical advice.

First day of last menstrual period (LMP)
Enter the first day of your last period.
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About Due Date Calculator

Enter the first day of the last menstrual period to estimate the due date, current week of pregnancy, and trimester (Naegele's rule). An estimate, not medical advice. It's a free lifestyle tool from ChatGBT that runs right in your browser — no signup, no install, and no cost.

How to use Due Date Calculator

  1. Enter your details in the fields above.
  2. Click Generate to run Due Date Calculator.
  3. Copy or refine the result — run it as many times as you like.

Is Due Date Calculator free?

Yes — Due Date Calculator is completely free to use with no account required. Explore ChatGBT's full AI tools directory for more lifestyle and productivity tools.