Når er det vanligst å føde i forhold til termin?

Kun ca 5% av alle kvinner føder på den eksakte termindatoen. Det regnes som normalt å føde alt mellom uke 37 og uke 42. Det vil si at fødselen kan skje alt fra 3 uker før termin til 2 uker etter.

Term calculator

Q: How do you calculate the due date?

Deadline regnes ut ved å legge til 283 days fra den første dagen i din siste menstruasjon (Naegeles regel, tilpasset norsk standard). Et normalt svangerskap varer i gjennomsnitt 40 uker og 3 days.

Find out your expected date of birth and how far along you are.

How it works: Enter the first day of your last menstrual period. The calculator uses the standard Naegele rule (283 days) to calculate your expected due date and tell you exactly which week and trimester you are currently in.

First day of last period

Average cycle length

days

Most people have a cycle of 28 days.

Expected due date

Select date

You are in week -

Trimester -

Only about 5% of babies are born exactly on their due date. It is completely normal to give birth two weeks before or two weeks after this date.

Frequently asked questions about term dates

How do you calculate the due date?

In Norway, the due date is normally calculated based on Naegele's rule, adapted to the Norwegian length of pregnancy. You start from the first day of your last period, and add 283 days (which corresponds to 40 weeks and 3 days). However, an ultrasound around week 18 will give a more accurate ultrasound date.

What trimester am I in?

Pregnancy is divided into three trimesters: The first trimester lasts from week 1 to the end of week 12. The second trimester runs from week 13 to and including week 27. The third and final trimester starts in week 28 and lasts until birth.