---
title: "Pregnancy Due Date Calculator — EDD from LMP or Conception Date"
description: "Calculate your estimated due date (EDD) using last menstrual period or conception date. Shows trimester timeline and current gestational age. Based on Naegele's Rule (40 weeks)."
url: "https://worldcalculators.org/calculators/due-date/"
canonical: "https://worldcalculators.org/calculators/due-date/"
---

# Pregnancy Due Date Calculator

Calculate your estimated due date (EDD) using last menstrual period or conception date. Shows trimester timeline and current gestational age. Based on Naegele's Rule (40 weeks).

## Quick answer

Naegele's Rule: Due date = LMP + 280 days (40 weeks). Full term is 39–40 weeks. Only ~4–5% of babies arrive on their exact due date. The EDD is a midpoint — deliveries between 37–42 weeks are considered normal.

## How Due Dates Are Calculated Around the World

Despite cultural differences in how pregnancy is described, all modern medical systems use the same underlying formula: EDD = LMP + 280 days .

Source: https://worldcalculators.org/calculators/due-date/
Markdown mirror of the HTML page. Prefer this URL for RAG; the interactive calculator still lives on the HTML page.