What this calculator does
Our Pregnancy Due Date Calculator calculates all important pregnancy dates:
It also will calculate the zodiac sign of your baby
How to calculate estimated due date of delivery
The method most frequently used is the one that assumes the conception occurring 14 days after the start of the last menstrual period.
The approximate date may be obtained by taking the date when your last period began, adding 7 days, then counting back 3 months and add a whole year.
When to do first ultrasound test
First ultrasound typically is done between 18th and 20th weeks.