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Conceived in March: when is the baby due?

A baby conceived in March is due between 22 November and 22 December.

That is 38 weeks (266 days) after conception: a pregnancy is counted as 40 weeks from the first day of the last period, about two weeks before conception.

Calculate from
days

Usually 28 days. Count from the first day of one period to the first day of the next.

Calculated on your device. Nothing is sent.

Estimated due date

Enter a date to see your estimated due date.

Not medical advice. Every pregnancy is different: ask your midwife or doctor about yours.

Due date for each day in March

Due date for a conception on each day in March
ConceptionDue date
1 March22 November
2 March23 November
3 March24 November
4 March25 November
5 March26 November
6 March27 November
7 March28 November
8 March29 November
9 March30 November
10 March1 December
11 March2 December
12 March3 December
13 March4 December
14 March5 December
15 March6 December
16 March7 December
17 March8 December
18 March9 December
19 March10 December
20 March11 December
21 March12 December
22 March13 December
23 March14 December
24 March15 December
25 March16 December
26 March17 December
27 March18 December
28 March19 December
29 March20 December
30 March21 December
31 March22 December

In a leap year, the date moves by one day when 29 February falls between conception and the due date.

Frequently asked questions

If we conceived in March, when is the baby due?

A baby conceived in March is due between 22 November and 22 December. The table on this page gives the due date for each day of conception, and the calculator works it out from your own date.

Why is the due date 40 weeks if the baby was conceived 38 weeks before?

Pregnancy is counted from the first day of the last period, about two weeks before ovulation and conception. So the 40 weeks include two weeks before the baby was conceived.

Will the baby come on the due date?

Probably not exactly. Only about 4% of babies are born on their due date, and most arrive in the two weeks before or after it. An early scan gives the most reliable date.