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Pregnancy Due Date from Last Menstrual Period Calculator

Naegele's rule: EDD = LMP + 280 days.

Estimates estimated delivery date (EDD) using Naegele's rule: EDD = LMP + 280 days. Also shows weeks of gestation if a current date is provided.

Nadia Almasri By Nadia Almasri
Published Last reviewed 1 min read

Inputs

days ago
days

Results

Enter values and click Calculate to see results.
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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

EDD = LMP + 280 days

In depth

Estimates estimated delivery date (EDD) using Naegele's rule: EDD = LMP + 280 days. Also shows weeks of gestation if a current date is provided.