Enter the first day of your last menstrual period and press Calculate.

Last menstrual period:

Cycle length: Days

The time from the first day of one period to the first day of the next; usually 28 days.

Gestational age	weeks days
Estimated due date
Estimated ovulation date
Date of fertilisation
First doctor's appointment Week 6	Between these dates
Date when the baby's heartbeat begins
Approximate period of increased risk of abnormalities from external influences Weeks 4-12	Between these dates
CVS, if performed Weeks 9-13	Between these dates
Nuchal translucency measurement and combined screening test Weeks 11-14	Between these dates
Amniocentesis, if performed Weeks 16-20	Between these dates
Alpha-fetoprotein testing Weeks 16-20	Between these dates
Triple screening test, if performed Weeks 16-20	Between these dates
Level 2 ultrasound Weeks 18-23	Between these dates
Ultrasound of the baby's heart Week 23	Between these dates
Gestational diabetes screening 50 g glucose challenge test Week 24	Between these dates
Early Rhogam administration Week 28	Between these dates
Tetanus vaccination Weeks 20-24	Between these dates