Date of delivery

Pregnancy is calculated in terms of amenorrhoea. In other words, the number of weeks since the mother's last period. In principle, a pregnancy can be expected to last 39 weeks from fertilisation until birth, or 41 weeks of amenorrhoea.

 

Expected date of delivery
Weeks of amenorrhoea Weeks of pregnancy Months of pregnancy

6 

4 

1st 

10 

8 

2nd 

15 

13 

3rd 

19 

17 

4th 

24 

22 

5th 

28 

26 

6th

32 

30 

7th 

36 

34 

8th

41 

39 

9th

Calculate your expected date of delivery

To calculate when your baby will be born, count 41 weeks from the date of the first day of your last period.

  • Date of your last period (day 1): day/month/year = N
  • Expected delivery date = N + 41 weeks = day/month/year

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