How is the EDD calculated?

The EDD is calculated based on the first day of your last menstrual period and adding 280 days (40 weeks).

What is an EDD calculator used for?

An EDD calculator estimates the due date for the birth of a baby.

Expected Date of Delivery (EDD) Calculator

This calculator helps expecting parents and healthcare professionals estimate the due date for a baby's birth. Simply enter the relevant information to calculate the expected delivery date.

EDD Calculator

First day of your last menstrual period (LMP): *

Estimated Due Date:

Authoritative Data Source and Methodology

Data is sourced from reliable medical guidelines. All calculations are based on standard obstetric formulas.

The Formula Explained

The formula used for EDD calculation is:

EDD = LMP + 280 days

Glossary of Terms

LMP: Last Menstrual Period, the first day of your last period.
EDD: Estimated Due Date, the estimated date when the baby will be born.

Frequently Asked Questions (FAQ)

How accurate is the EDD?

The EDD is an estimate and actual delivery can vary by a couple of weeks.

What if I don't remember my LMP?

Your healthcare provider can estimate the EDD using ultrasound data.

Can the EDD change?

Yes, based on ultrasound findings and other factors.