Due Date Calculator

Calculate your estimated due date based on last menstrual period.

Updated April 2026 · CalcFlow Editorial

Enter values above and click Calculate to see your results.

How to Use

  1. Enter the first day of your last menstrual period.
  2. Enter your average cycle length.
  3. Click Calculate.

Formula

Due Date = LMP + 280 days (adjusted for cycle length)

Frequently Asked Questions

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