Pregnancy Calculator: Calculate Your Estimated Due Date (Free)

Pregnancy Settings

First Day of Last Menstrual Period (LMP)

Average Cycle Length (Days)

20 Days 45 Days

Due Date Projection

Estimated Due Date Select LMP Date

Gestational Age -

Countdown -

About Pregnancy Due Date Calculator

Advanced Pregnancy Estimated Due Date (EDD) Calculator

Our Pregnancy Calculator is a premium, professional-grade calendar utility designed to project your estimated baby due date. By utilizing standard clinical equations, it maps out your pregnancy progress, trimester markers, and daily developmental milestones.

Understanding Naegele's Rule for Due Dates

Due dates are calculated using Naegele's Rule. The formula estimates birth projections by adding exactly 280 days (40 weeks) to the first day of your last menstrual period (LMP), while dynamically adjusting for variations in your personal menstrual cycle length.

Unique Interactive Progress Features

Gestational Tracker: Read your exact gestational age down to the precise number of weeks and days.
Trimester Progress Indicator: A gorgeous, color-blocked timeline illustrating your progress through the 1st, 2nd, and 3rd trimesters.
Baby Size Fruit Index: Map your gestational week to highly entertaining baby size comparisons (e.g., Week 8 = size of a raspberry, Week 20 = size of a banana!).

Common Questions

It follows clinical calculations mapping exactly 280 days from the start of your last period. While extremely accurate, only about 4% of babies are born on their exact due date, with most arriving within 7 days before or after.

A standard full-term pregnancy is considered to be 40 weeks (280 days), beginning from the first day of your last period, divided into three distinct trimesters.

If your average menstrual cycle is longer or shorter than the standard 28 days, our calculator automatically adjusts your estimated due date forward or backward to match your exact cycle variance.

Pregnancy Due Date Calculator