FeaturedCalculating Your Due Date: How the Naegele Rule Works
The Naegele rule determines the estimated due date from the first day of the last period. How the formula works, why cycle length matters and what the date really means.
Latest articles about Due Date Calculator
Try it yourself with the
Due Date Calculator
FeaturedThe Naegele rule determines the estimated due date from the first day of the last period. How the formula works, why cycle length matters and what the date really means.

Why are pregnancy weeks counted from the last period and not from conception? What does the notation "12+3" mean and how are the three trimesters divided? A clear overview.

From implantation to birth: what happens in each of the three trimesters, which milestones lie ahead and which check-ups matter — an overview of the 40 weeks.

Maternity protection begins six weeks before the due date and ends eight (or twelve) weeks after birth. How the periods are calculated under § 3 MuSchG and what applies if the baby arrives earlier or later.

The due date has passed and your baby is taking its time? Why this is usually no cause for concern, when a pregnancy is considered post-term and how medical monitoring works.
Calculate fertile days, ovulation & next period — not a contraception method
Calculate now →Calculate your German Elterngeld (parental allowance) 2026: basic & Plus, with monthly income overview for parental leave
Calculate now →What does raising a child cost from 0-18? Childcare, clothing, education
Calculate now →