Pregnancy Due Date Calculator

Estimate your due date using Naegele's rule from last menstrual period.

First day of your last period

How to Use This Calculator

  1. Enter your Last Menstrual Period (LMP) — First day of your last period.
  2. Enter your Cycle Length (days).
  3. Click Calculate to see instant results with a step-by-step breakdown.
  4. Use the Share button to copy a link with your inputs pre-filled.

⚠️ Results are for informational purposes only. Always verify important calculations with a qualified professional.

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