Welcome to the Pregnancy Calculator, a free service from Dr Penman at Fetal Medicine UK.

Enter the date of the first day of your last period. The calculator will estimate your due date, as well as when you should go for the various scans throughout your pregnancy, such as your 12 week Nuchal Scan. You won’t miss a date again!

*Please note: Sometimes Ad Blocker prevents this calculator from working properly. If you experience problems with this calculator, try disabling your Ad Blocker and refreshing the page.

Click the ‘Book A Baby Scan’ Button to the right of the calculator for your appointment with Dr Penman!



Enter the date of the first day of your last menstrual period (LMP):



Probable date of conception:


Fetal Age Today:


Viability Scan Date:


(7 weeks)

Best date range for NT scan:


(12 weeks 3 days to 13 weeks 3 days)

Anomaly Scan Date:


(19 weeks)

Best time for routine anomaly ultrasound:


(18 to 20 weeks)

Estimated Due Date: