Naegele’s Rule

Featured November 04, 2025

Naegele’s Rule Explained

Naegele's rule is the formula behind almost every due date calculator. It turns the first day of your last menstrual period (LMP) into an estimated due date (EDD).

Read story

duedatecal.com offers free calculators for your due date, ovulation window, and everyday date math, along with pregnancy dating articles sourced from ACOG, the NHS, and the Mayo Clinic. Every calculator runs in your browser, so your dates are never saved or shared. We provide general information only, not medical advice.

Explore

Home Blog due date calculator Ovulation calculator

About

Contact Privacy Policy

Latest Posts

Naegele's rule Explained IVF Due Date Calculator How Accurate Are Due Date Calculators Why Your Due Date Can Change After an Ultrasound Overdue Pregnancy What Happens Next Pregnancy Questions Centre

Let's Connect

Have question or more info? Due Date Cal

Made with

Home
Due Date Calculator
Ovulation Calendar
Latest Posts