Due Date Calculator

Calculate your estimated due date (EDD) using LMP, conception date, ultrasound, or IVF transfer date

Pregnancy Information

Calculation Method

First Day of Last Menstrual Period

First day of your last period

Estimated Due Date (EDD)

Only 5% of babies are born on their exact due date

LMP Date

Conception Date

Current Gestational Age

Days Until Due Date

Pregnancy Progress

Conception Today Due Date

-- Trimester

Pregnancy Timeline

This Week's Development

Enter your due date information to see weekly milestones.

Understanding Your Due Date

What is a Due Date?

An estimated due date (EDD) is calculated as 40 weeks (280 days) from the first day of your last menstrual period (LMP). Only about 5% of babies are born on their exact due date.

Full Term Range

Early term: 37-38 weeks
Full term: 39-40 weeks
Late term: 41 weeks
Post-term: 42+ weeks

Calculation Methods

• Naegele's Rule: LMP + 280 days
• Conception Date: Conception + 266 days
• Ultrasound: Most accurate in first trimester
• IVF Transfer: Based on embryo age

💡 First-trimester ultrasound is the most accurate method for dating pregnancy.