How accurate is the estimated due date?

Naegele's Rule gives a standard estimate, but only about 5% of babies arrive exactly on the due date. An ultrasound provides a more precise estimate.

Pregnancy Calculator

Estimate your due date and pregnancy week

First Day of Last Period

8w 4d

Current Pregnancy Week

Estimated Due Date = First Day of Last Period + 280 days (Naegele's Rule)

Example 1

LMP = 60 days before today

Currently in week 8, due in about 220 more days

Calculate your Body Mass Index and healthy weight range

Estimate your daily calorie needs based on activity level

Find your ideal body weight range

How much water you should drink daily