What this calculator does
Our Pregnancy Due Date Calculator calculates all important pregnancy dates:
Estimate due date of delivery
Date of first heart beat
Date of first move
Date of first reliable pregnancy test
Date of first ultrasound test
End of second trimester
End of third trimester
It also will calculate the zodiac sign of your baby
The chance of the baby being born in the week it's due (40th week) is estimated at approximately 30%, around 66% are born within 10 days before or after the due date.
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.
Accuracy of Estimation
Please remember that your due date is only an estimate. On average only 5% of births take place exactly on the estimated due date. Most are born within a week either side of the estimated due date.